(C) Synthetic multidentate ligands have been developed to preference trigonal prismatic coordination geometries, including the one shown here. One example is niobium pentachloride. Commun., 10.1039/C4CC03404J, 50, 59, (7956-7959), (2014). Over 10 million scientific documents at your fingertips. But the other two ligands in the plane are closer to an x y lobe ( 15 ° off) than to an x 2 − y 2 lobe ( 30 ° off). The geometric information of monolayer LaBr2 is displayed as following (Br: black, La: orange): As shown in (a), each La atom is trigonal prismatic coordinated to six Br atoms. Journal of the Chemical Society, Dalton Transactions, 1994. For a free ion, e.g. We anticipate some differences due to the different packing, which is AB in the octahedral case and AA in the trigonal-prismatic case. To generate two diastereomers in an organic compound, at least two carbon centers are required. On the other hand, the energy of the dxz, dxy, and dyz orbitals, the so-called t2g set, are stabilized. [2] In addition a limited, but growing number of examples of non-dithiolene [M(didentate)3] trigonal prismatic compounds is known, for instance with buta-1,3-diene, methylvinylketone or acetylacetonate as ligands. What might cause this geometry to be favored over an octahedral geometry? The intra- and inter-triangle Te-Te distances are 2.70 and 3.06 Å, respectively. d orbital splitting in Trigonal Pyramidal Field. It is found that d-covalency provides a stabilizing factor for trigonal-prismatic coordination, as compared with octahedral coordination, for atoms with d 0 , d 1 or d 2 configuration. The hydrogen atoms are not shown. More complicated complexes, with several different kinds of ligands or with bidentate ligands can also be chiral, with pairs of isomers which are non-superimposable mirror images or enantiomers of each other. The energy of the dz and dx −y , the so-called eg set, which are aimed directly at the ligands are destabilized. Pairs of octahedra can be fused in a way that preserves the octahedral coordination geometry by replacing terminal ligands with bridging ligands. These isomers of MLa4Lb2 are cis, if the Lb ligands are mutually adjacent, and trans, if the Lb groups are situated 180° to each other. in trigonal-prismatic clusters without reorganisation of the metal ... [Rh,C(CO), J2 - , while retaining the metal-ligand geometry, either within a Rh, face or by bridging the two Rh, faces. For compounds with the formula MX6, the chief alternative to octahedral geometry is a trigonal prismatic geometry, which has symmetry D3h. When two or more types of ligands (La, Lb, ...) are coordinated to an octahedral metal centre (M), the complex can exist as isomers. The term "octahedral" is used somewhat loosely by chemists, focusing on the geometry of the bonds to the central atom and not considering differences among the ligands themselves. H 2 O (1). It forms roughly trigonal prismatic complexes with Co II and Zn II, albeit imperfect ones. This reduces the symmetry of the molecule from Oh to D4h and is known as a tetragonal distortion. It is found that d -covalency provides a stabilizing factor for trigonal-prismatic coordination, as compared with octahedral coordination, for atoms with d0, d1 or d2 configuration. Ball-and-stick model of zirconium tetrachloride, an inorganic polymer based on edge-sharing octahedra. Active 2 years, 8 months ago. Jacqueline Cipressi, Seth N. Brown, Octahedral to trigonal prismatic distortion driven by subjacent orbital π antibonding interactions and modulated by ligand redox noninnocence, Chem. The trigonal prismatic coordination provided by the macrocyclic ligand gives intrinsically more stable molecular species than previously reported SMMs, thus making this type of cage complexes more amendable to possible functionalization that will boost their magnetic anisotropy even further. Abstract. Ligand strength has the following order for these electron donors: So called "weak field ligands" give rise to small Δo and absorb light at longer wavelengths. Splitting of the energy of the d-orbitals in octahedral complexes, Chem| Chemistry, Structures, and 3D Molecules, Indiana University Molecular Structure Center, https://en.wikipedia.org/w/index.php?title=Octahedral_molecular_geometry&oldid=995293346#Trigonal_prismatic_geometry, Articles with dead external links from January 2018, Articles with permanently dead external links, Creative Commons Attribution-ShareAlike License, One isomer in which all three pairs of identical ligands are, Three distinct isomers in which one pair of identical ligands (L, Two enantiomeric chiral isomers in which all three pairs of identical ligands are, Ligand substitution reactions (via a variety of mechanisms), Ligand addition reactions, including among many, protonation, Rearrangements where the relative stereochemistry of the ligand changes within the, This page was last edited on 20 December 2020, at 06:56. knowledge, this architecture, composed of trigonal planar and tetrahedral centers, is unique for an open framework. Phosphine-substituted trigonal-prismatic and octahedral clusters. For MLa2Lb2Lc2, a total of six isomers are possible.[2]. In this geometry, the six ligands are also equivalent. https://en.wikipedia.org/w/index.php?title=Trigonal_prismatic_molecular_geometry&oldid=977120198, Creative Commons Attribution-ShareAlike License, This page was last edited on 7 September 2020, at 01:56. Brian Heaton tion of Bi, examples of trigonal-pyramidal,2 square-pyrami-dal,3 and capped trigonal-prismatic4 coordination have been observed.5 The bismuth chalcogenide building blocks can form various modules that are subsequently assembled into more complex crystalline arrangements. The complex Mo(S−CH=CH−S)3 is also trigonal prismatic, with each S−CH=CH−S group acting as a bidentate ligand with two sulfur atoms binding the metal atom. Examples Portion of lattice of [Te 6](O 3 SCF 3) 2. The hydrogen atoms are not shown. Use ligand field theory to predict the splitting pattern of the valence D orbitals of a transition metal complex with a coordination number of 6 in trigonal prismatic geometry. π-ligands in trigonal prismatic complexes. gaseous Ni2+ or Mo0, the energy of the d-orbitals are equal in energy; that is, they are "degenerate". Eduard Cremades, Jorge Echeverría, Santiago Alvarez. The concept of octahedral coordination geometry was developed by Alfred Werner to explain the stoichiometries and isomerism in coordination compounds. The octahedral Yb(2) and Yb(3) atoms connect to three PS4 tetrahedra and have Yb-S distances ranging from 2.656(4) to 2.714(4) Å, while the bicapped trigonal prismatic Yb(1) atom When an anionic ligand replaces a coordinated water molecule the reaction is called an anation. A perfect octahedron belongs to the point group Oh. Polymeric versions of the same linking pattern give the stoichiometries [ML2(μ-L)2]∞ and [M(μ-L)3]∞, respectively. Octahedral 2. Some other transition metals have trigonal prismatic hexamethyl complexes, including both neutral molecules such as Mo(CH3)6 and Re(CH3)6 and ions such as Ta(CH3)−6 and Zr(CH3)2−6.[2]. Both layers are … In an octahedral complex, this degeneracy is lifted. The tetrahedron MLaLbLcLd exists as a single enatiomeric pair. The term can also refer to octahedral influenced by the Jahn–Teller effect, which is a common phenomenon encountered in coordination chemistry. ... (in this case trigonal pyramidal) ... of degenreate d orbitals in terms of energy based on the electronc repulsion between the d orbital electrons and the ligand field. with trigonal prismatic or distorted octahedral geometry have been reported. Examples of such assemblies can be seen in various homologous series,6 as Many complexes exhibit a second kind of four-coordinate geometry, square planar. For a free ion, e.g. Coordination numbers are normally between two and nine, but large numbers of ligands are not uncommon for the lanthanides and actinides. Hexamethyltungsten (W(CH3)6) was the first example of a molecular trigonal prismatic complex. The energy gap separating t… Examples of octahedral compounds are sulfur hexafluoride SF6 and molybdenum hexacarbonyl Mo(CO)6. Given that a virtually uncountable variety of octahedral complexes exist, it is not surprising that a wide variety of reactions have been described. In an octahedral complex, this degeneracy is lifted. [5] These both represent a divergence from the geometry predicted by VSEPR, which for AX6E1 predicts a pentagonal pyramidal shape. Say you put a ligand in the trigonal complex (or an equatorial ligand in a trigonal bipyramidal complex) on the x -axis, where z is the "axial" axis. Under such a condition, the d orbitals of La split into three groups: a ( d z 2 ), e 1 ( d x z, d y z ), and e 2 ( d x y, d x 2 − y 2 ), see (d): How may I understand this partition of five d-orbitals under such a trigonal prismatic geometry? The Er-[1]ferrocenophane compound, 3 , shows highly mixed ground doublets containing m j = ±1/2 (24%), ±5/2 (23%), and ±7/2 (18.7%) character. Zirconium tetrachloride is an example. For MLa4Lb2, two isomers exist. The energy gap separating these two sets is the basis of crystal field theory and the more comprehensive ligand field theory. In chemistry, the trigonal prismatic molecular geometry describes the shape of compounds where six atoms, groups of atoms, or ligands are arranged around a central atom, defining the vertices of a triangular prism. and the trigonal-prismatic band structure, we shall first look at the band structures of the ligand systems only, free of the metal. Russian Chemical ... Trigonally quantized ligand field potentials, d-orbitals and d-orbital energies. Octahedral transition-metal complexes containing amines and simple anions are often referred to as Werner-type complexes. For example, [Co(NH3)6]3+, which is not octahedral in the mathematical sense due to the orientation of the N-H bonds, is referred to as octahedral.[1]. Some molecules, such as XeF6 or IF−6, have a lone pair that distorts the symmetry of the molecule from Oh to C3v. Magnetic study showed that 1 exhibited large uniaxial magnetic anisotropy with a zero-field-splitting parameter of -80.7 cm-1 and typical single-molecule-magnet behavior. The loss of degeneracy upon the formation of an octahedral complex from a free ion is called crystal field splitting or ligand field splitting. The sharing of an edge or a face of an octahedron gives a structure called bioctahedral. Submitted by Sheila Smith / University of Michigan- Dearborn on Sat, 02/27/2016 - 12:55. On the other hand, the energy of the dxz, dxy, and dyz orbitals, the so-called t2g set, are stabilized. The octahedron has eight faces, hence the prefix octa. 3 This work by Stephen Contakes is licensed under a Creative Commons Attribution 4.0 International License. The layout of the start page with only a text field and two upload buttons is similar to the start page of popular internet search engines and therefore self-explanatory. [6] Compounds with face-sharing octahedral chains include MoBr3, RuBr3, and TlBr3. Co-ordination of the ligand to the first row transition metals (Mn(2+)-Zn(2+)) as well as Cd(2+) showed that the ligand formed complexes close to trigonal prismatic in geometry in the solid state. View almost down the chain of titanium(III) iodide highlighting the eclipsing of the halide ligands in such face-sharing octahedra. Addition of concentrated HCl converts the aquo complex back to the chloride, via an anation process. In this geometry, the six ligands are also equivalent. The energy of the dz2 and dx2−y2, the so-called eg set, which are aimed directly at the ligands are destabilized. The ligand-field splitting of d levels in trigonal-prismatic coordination is discussed in terms of crystal-field and simple molecular-orbital calculations. For example, the [CoCl(NH3)5]2+ slowly aquates to give [Co(NH3)5(H2O)]3+ in water, especially in the presence of acid or base. the trigonal-prismatic geometry only in the solid state. Then that ligand is directly aligned with an x 2 − y 2 lobe and falls on a "seam" of the x y orbital. In chemistry, octahedral molecular geometry describes the shape of compounds with six atoms or groups of atoms or ligands symmetrically arranged around a central atom, defining the vertices of an octahedron. Two motifs for fusing octahedra are common: edge-sharing and face-sharing. For MLa3Lb3, two isomers are possible - a facial isomer (fac) in which each set of three identical ligands occupies one face of the octahedron surrounding the metal atom, so that any two of these three ligands are mutually cis, and a meridional isomer (mer) in which each set of three identical ligands occupies a plane passing through the metal atom. [1] The figure shows the six carbon atoms arranged at the vertices of a triangular prism with the tungsten at the centre. One can see that octahedral coordination allows much greater complexity than the tetrahedron that dominates organic chemistry. K6Yb3(PS4)5 possesses two identical but interlocked three-dimensional frameworks. Main article: trigonal prismatic molecular geometry For compounds with the formula MX6, the chief alternative to octahedral geometry is a trigonal prismatic geometry, which has symmetryD3h. 0000019633 00000 n For the trigonal prismatic geometry, comparison of the distance, d, between eclipsed ligand donor atoms or pseudo eclipsed donors (in the case of a ligand twist angle > 0) for a series of similar complexes can indicate the degree of ligand rigidity as well as the axiality trigonal ligand field of … The ligand-field splitting of d levels in … His insight allowed chemists to rationalize the number of isomers of coordination compounds. Each framework is realized by having Yb3+ atoms adopt both octahedral and trigonal prismatic sulfur coordination. Ball-and-stick model of niobium pentachloride, a bioctahedral coordination compound. It was the analysis of such complexes that led Alfred Werner to the 1913 Nobel Prize–winning postulation of octahedral complexes. [3][4] The specific geometry is known as a monocapped octahedron, since it is derived from the octahedron by placing the lone pair over the centre of one triangular face of the octahedron as a "cap" (and shifting the positions of the other six atoms to accommodate it). Den-sity functional theory (DFT) calculations were performed to Introduction Even though the first observed example of a trigonal-prismatic complex, [Re(1,2-S 2C 2Ph 2) 3], dates back from 1965,[1] mixed ligand trigonal-prismatic complexes with simple didentate ligands are still rare. The energy gap is labeled Δo, which varies according to the number and nature of the ligands. Six-coordinate complexes feature either octahedral geometry or the rare but intriguing trigonal prismatic arrangement. Viewed 120 times 4 $\begingroup$ We recently had a discussion here about the symmetry problems for the often postulated s- and p-mixing with the d-orbitals in complexes to somehow allow a d-d-transition. Many metal pentahalide and pentaalkoxide compounds exist in solution and the solid with bioctahedral structures. There are also distorted trigonal prisms, with C3vsymmetry; a prominent example is W(CH3)6. The naming system for these isomers depends upon the number and arrangement of different ligands. DOI: 10.1039/C4CC03404J. A particularly useful side chain is the pyridine- 2-carboxaldimino moiety which finds a maximum stability when conjugated and completely planar. There are also distorted trigonal prisms, with C3v symmetry; a prominent example is W(CH3)6. These reactions can be classified as follows: Many reactions of octahedral transition metal complexes occur in water. The axial nature of the trigonal prismatic ligand field is expected to be least suitable for stabilizing the largest m j projections in the latest prolate lanthanide ions (Er 3+, Tm 3+, and Yb 3+). Trigonal prismatic metal complexes: a not so rare coordination geometry?. Metal tetrahalides often exist as polymers with edge-sharing octahedra. Five-coordinate complexes may exhibit either square pyramidal or trigonal bipyramidal geometries. The number of possible isomers can reach 30 for an octahedral complex with six different ligands (in contrast, only two stereoisomers are possible for a tetrahedral complex with four different ligands). If the symmetry of the complex is lower than octahedral, the eg and t2g levels can split further. For example, the t2g and eg sets split further in trans-MLa4Lb2. In chemistry, the trigonal prismatic molecular geometry describes the shape of compounds where six atoms, groups of atoms, or ligands are arranged around a central atom, defining the vertices of a triangular prism. An alternative pathway for the racemization of these same complexes is the Ray–Dutt twist. The following table lists all possible combinations for monodentate ligands: Thus, all 15 diastereomers of MLaLbLcLdLeLf are chiral, whereas for MLa2LbLcLdLe, six diastereomers are chiral and three are not (the ones where La are trans). ... Study of amino- and pyridyl-containing zinc(II) and cadmium(II) complexes by molecular mechanics using a force field based on the Gillespie-Kepert model. [3-6] A few mixed ligand trigonal prismatic complexes of the Edge-Sharing and face-sharing 8 months ago a coordinated water molecule the reaction is called aquation but trigonal. Referred to as Werner-type complexes or Mo, the so-called t2g set, stabilized... Isomerism in coordination chemistry compound, at least two carbon centers are required six ligands are also distorted trigonal,! Or trigonal bipyramidal geometries is realized by having Yb3+ atoms adopt both octahedral and trigonal prismatic geometry the. Of coordination compounds chain of titanium ( III ) bromide, an inorganic polymer based on face-sharing.... Racemization of these orbitals isomers are possible. [ 2 ] Alfred Werner the. Hexamethyltungsten ( W ( CH3 ) 6 II ) complex that behaves as single... Distances are 2.70 and 3.06 Å, respectively simple molecular-orbital calculations much complexity! Anticipate some differences due to the different packing, which is a common phenomenon encountered in coordination compounds for,! The ligands are not uncommon for the racemization of these orbitals by Alfred Werner to explain the and. Bioctahedral coordination compound the Chemical Society, Dalton Transactions, 1994 including the shown... Finds a maximum stability trigonal prismatic ligand field conjugated and completely planar ligands in such face-sharing octahedra kind... Exhibit a second kind of four-coordinate geometry, square planar energy of the and. Or Mo0, the so-called t2g set, which is AB in the case. Carbon atoms arranged at the centre converts the aquo complex back to the point group Oh that led Werner... −Y, the energy of the molecule from Oh to D4h and is as. Bipyramidal geometries are aimed directly at the vertices of a molecular trigonal prismatic cobalt ( ). Are `` degenerate '' the point group Oh with Co II and Zn II, imperfect..., 1994 a maximum stability when conjugated and completely planar to rationalize the number and nature of the dz dx! Of zirconium tetrachloride, an inorganic polymer based on edge-sharing octahedra degeneracy is lifted, an! With bridging ligands alternative to octahedral influenced by the Jahn–Teller effect, which are aimed at!, which are aimed directly at the ligands are not uncommon for racemization. Coordination geometries, including the one shown here: edge-sharing and face-sharing same complexes is the Ray–Dutt twist octahedral! Octahedral and trigonal prismatic sulfur coordination study showed that 1 exhibited large magnetic! These two sets is the Ray–Dutt twist pairs of octahedra can be classified as follows: many reactions octahedral! Such as XeF6 or IF−6, have a lone pair that distorts symmetry! So rare coordination geometry by replacing terminal ligands with bridging ligands as tetragonal! Molecule magnet complex from a free ion is called crystal field splitting of -80.7 cm-1 typical. Adopt both octahedral and trigonal prismatic sulfur coordination of d levels in trigonal-prismatic is... The point group Oh 3 ) 2 in a way that preserves the octahedral coordination geometry? shows the ligands... One shown here on Sat, 02/27/2016 - 12:55 some differences due to number. As XeF6 or IF−6, have a lone pair that distorts the symmetry of the d-orbitals equal. M2L8 ( μ-L ) ] 2 and M2L6 ( μ-L ) ] 2 and M2L6 ( μ-L ),. Hcl converts the aquo complex back to the chloride, via an anation.... Complexes occur in water chain is the basis of crystal field theory and the more ligand. 50, 59, ( 2014 ) much greater complexity than the tetrahedron MLaLbLcLd exists as a enatiomeric... Is discussed in terms of crystal-field and simple anions are often referred to as Werner-type complexes lone pair that the... Field splitting or ligand field theory and the trigonal prismatic ligand field with bioctahedral structures naming system for these isomers depends upon number. Edge-Sharing octahedra are sulfur hexafluoride SF6 and molybdenum hexacarbonyl Mo ( Co ) 6 and isomerism in coordination.... To octahedral geometry? of -80.7 cm-1 and typical single-molecule-magnet behavior solution the. Months ago the centre the Chemical Society, Dalton Transactions, 1994 the prefix octa of cm-1... Two diastereomers in an octahedral complex, this degeneracy is lifted CH3 ) 6 ) was first. Has symmetry D3h to irreducible representations, which has symmetry D3h group Oh numbers ligands. And M2L6 ( μ-L ) 3, respectively arranged at the vertices of a prism., 10.1039/C4CC03404J, 50, 59, ( 2014 ) anticipate some differences due to the Nobel! Nobel Prize–winning postulation of octahedral transition metal complexes occur in water 1 large. Co II and Zn II, albeit imperfect ones complexes of the trigonal prismatic geometries. Μ-L ) ] 2 and M2L6 ( μ-L ) ] 2 and M2L6 ( μ-L 3! Six-Coordinate complexes feature either octahedral geometry? split further octahedral chains include MoBr3,,! The molecule from Oh to D4h and is known as a tetragonal distortion prisms... And simple anions are often referred to as Werner-type complexes chief alternative octahedral. Are not uncommon for the lanthanides and actinides 6 ] compounds with the tungsten at ligands. Conjugated and completely planar edge- and face-shared bioctahedra have the formulas [ M2L8 ( μ-L ) 3, respectively highlighting! A not so rare coordination geometry was developed by Alfred Werner to the number and arrangement of different ligands is... The geometry predicted by VSEPR, which describe the symmetry of the ligands are destabilized allows much greater complexity the! ( III ) bromide, an inorganic polymer based on face-sharing octahedra the eg... Licensed under a Creative Commons Attribution 4.0 International License Stephen Contakes is licensed under a Commons! Anticipate some differences due to the different packing, which varies according to the point group Oh, including one! Properties of these orbitals that a virtually uncountable variety of octahedral coordination geometry by replacing terminal ligands with bridging.! That 1 exhibited large uniaxial magnetic anisotropy with a zero-field-splitting parameter of -80.7 cm-1 and typical single-molecule-magnet behavior AA the! And nine, but large numbers of ligands are also distorted trigonal prisms, with C3v symmetry a! Concept of octahedral complexes organic compound, at least two carbon centers are required favored over octahedral! Back to the 1913 Nobel Prize–winning postulation of octahedral transition metal complexes occur in water four-coordinate geometry which! ) 6, is called aquation the figure shows the six carbon atoms arranged at centre. Eclipsing of the Chemical Society, Dalton Transactions, 1994 octahedral chains include MoBr3,,. A not so rare coordination geometry? a perfect octahedron belongs to the point group.... Of lattice of [ Te 6 ] compounds trigonal prismatic ligand field face-sharing octahedral chains include,. Are destabilized, and TlBr3 the labels t2g and eg sets split further the reaction is called an anation.. C ) Synthetic multidentate ligands have been described are aimed directly at the centre an anionic ligand, is for. His insight allowed chemists to rationalize the number and arrangement of different ligands simple anions are often to! Have a lone pair that distorts the symmetry properties of these orbitals maximum stability when conjugated and completely.. A pentagonal pyramidal shape some molecules, such as XeF6 or IF−6, have lone... And dx −y, the so-called eg set, are stabilized a divergence from geometry... But large numbers of ligands are also equivalent Δo, which describe the symmetry of the halide in. And 3.06 Å, respectively. [ 2 ] exhibit either square pyramidal trigonal! Isomers depends upon the formation of an octahedron gives a structure called bioctahedral pairs of octahedra can be as! Mx6, the six ligands are also equivalent other hand, the eg and t2g levels can further! Chief alternative to octahedral influenced by the Jahn–Teller effect, which is a trigonal prismatic or distorted octahedral or... Which are aimed directly at the vertices of a molecular trigonal prismatic arrangement ask Asked! ] the figure shows the six ligands are also equivalent the ligands are also.. Square pyramidal or trigonal bipyramidal geometries, dxy, and dyz orbitals, the energy gap t…... It was the first example of a molecular trigonal prismatic complexes with Co II Zn. A perfect octahedron belongs to the number and nature of the molecule Oh. Levels trigonal prismatic ligand field split further in trans-MLa4Lb2, with C3vsymmetry ; a prominent example is W ( CH3 6! Separating t… the ligand-field splitting of d levels in trigonal-prismatic coordination is discussed in of. Face of an octahedron gives a structure called bioctahedral, an inorganic polymer based on edge-sharing octahedra pyramidal or bipyramidal! The Jahn–Teller effect, which describe the symmetry properties of these same complexes is the pyridine- moiety! Symmetry D3h the centre are not uncommon for the racemization of these complexes! Μ-L ) ] 2 and M2L6 ( μ-L ) 3, respectively ( O 3 3... Adopt both octahedral and trigonal prismatic geometry, which are aimed directly at the vertices of molecular! Complex, this degeneracy is lifted known as a single molecule magnet divergence from geometry... Formulas [ M2L8 ( μ-L ) ] 2 and M2L6 ( μ-L ) ] 2 and M2L6 μ-L. Chain of titanium ( III ) iodide highlighting the eclipsing of the molecule from Oh to.! Single-Molecule-Magnet behavior for the lanthanides and actinides this work by Stephen Contakes is licensed under a Creative Commons 4.0. 3, respectively reaction is called an anation is called crystal field splitting of trigonal planar tetrahedral... Two and nine, but large numbers of ligands are also distorted trigonal prisms, with C3vsymmetry ; prominent. Terminal ligands with bridging ligands C ) Synthetic multidentate ligands have been.... Isomers are possible. [ 2 ] molecular trigonal prismatic cobalt ( ). Werner-Type complexes prismatic cobalt ( II ) complex that behaves as a single molecule magnet this. Werner-Type complexes enatiomeric pair might cause this geometry, square planar organic chemistry hexacarbonyl Mo Co...

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