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Pérez-Jiménez M, Curado N, Maya C, Campos J, Ruiz E, Álvarez S, Carmona E. Experimental and Computational Studies on Quadruply Bonded Dimolybdenum Complexes with Terminal and Bridging Hydride Ligands. Chemistry 2021; 27:6569-6578. [PMID: 33469945 DOI: 10.1002/chem.202004948] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2020] [Revised: 01/13/2021] [Indexed: 11/07/2022]
Abstract
This contribution focuses on complex [Mo2 (H)2 (μ-AdDipp2 )2 ] (1) and tetrahydrofuran and pyridine adducts [Mo2 (H)2 (μ-AdDipp2 )2 (L)2 ] (1⋅thf and 1⋅py), which contain a trans-(H)Mo≣Mo(H) core (AdDipp2 =HC(NDipp2 )2 ; Dipp=2,6-iPr2 C6 H3 ). Computational studies provide insights into the coordination and electronic characteristics of the central trans-Mo2 H2 unit of 1, with four-coordinate, fourteen-electron Mo atoms and ϵ-agostic interactions with Dipp methyl groups. Small size C- and N-donors give rise to related complexes 1⋅L but only one molecule of P-donors, for example, PMe3 , can bind to 1, causing one of the hydrides to form a three-centered, two-electron (3c-2e) Mo-H→Mo bond (2⋅PMe3 ). A DFT analysis of the terminal and bridging hydride coordination to the Mo≣Mo bond is also reported, along with reactivity studies of the Mo-H bonds of these complexes. Reactions investigated include oxidation of 1⋅thf by silver triflimidate, AgNTf2 , to afford a monohydride [Mo2 (μ-H)(μ-NTf2 )(μ-AdDipp2 )2 ] (4), with an O,O'-bridging triflimidate ligand.
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Affiliation(s)
- Marina Pérez-Jiménez
- Instituto de Investigaciones Químicas (IIQ), Departamento de Química Inorgánica and Centro de, Innovación en Química Avanzada (ORFEO-CINQA), Consejo Superior de Investigaciones Científicas (CSIC) and University of Sevilla, Avda. Américo Vespucio, 49, 41092, Sevilla, Spain
| | - Natalia Curado
- Instituto de Investigaciones Químicas (IIQ), Departamento de Química Inorgánica and Centro de, Innovación en Química Avanzada (ORFEO-CINQA), Consejo Superior de Investigaciones Científicas (CSIC) and University of Sevilla, Avda. Américo Vespucio, 49, 41092, Sevilla, Spain
| | - Celia Maya
- Instituto de Investigaciones Químicas (IIQ), Departamento de Química Inorgánica and Centro de, Innovación en Química Avanzada (ORFEO-CINQA), Consejo Superior de Investigaciones Científicas (CSIC) and University of Sevilla, Avda. Américo Vespucio, 49, 41092, Sevilla, Spain
| | - Jesús Campos
- Instituto de Investigaciones Químicas (IIQ), Departamento de Química Inorgánica and Centro de, Innovación en Química Avanzada (ORFEO-CINQA), Consejo Superior de Investigaciones Científicas (CSIC) and University of Sevilla, Avda. Américo Vespucio, 49, 41092, Sevilla, Spain
| | - Eliseo Ruiz
- Departament de Quimica Inorgànica and Institut de Quimica Teòrica i Computacional, Universitat de Barcelona, Marti i Franquès 1-11, 08028, Barcelona, Spain
| | - Santiago Álvarez
- Departament de Quimica Inorgànica and Institut de Quimica Teòrica i Computacional, Universitat de Barcelona, Marti i Franquès 1-11, 08028, Barcelona, Spain
| | - Ernesto Carmona
- Instituto de Investigaciones Químicas (IIQ), Departamento de Química Inorgánica and Centro de, Innovación en Química Avanzada (ORFEO-CINQA), Consejo Superior de Investigaciones Científicas (CSIC) and University of Sevilla, Avda. Américo Vespucio, 49, 41092, Sevilla, Spain
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Mikhaylov MA, Sokolov MN. Molybdenum Iodides - from Obscurity to Bright Luminescence. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201900630] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Maxim A. Mikhaylov
- Nikolaev Institute of Inorganic Chemistry SB RAS; Prospect Lavrentyeva 3 630090 Novosibirsk Russia
| | - Maxim N. Sokolov
- Nikolaev Institute of Inorganic Chemistry SB RAS; Prospect Lavrentyeva 3 630090 Novosibirsk Russia
- Novosibirsk State University; ul. Pirogova 2 630090 Novosibirsk Russia
- Kazan Federal University; ul. Kremlyovskaya 18 420008 Kazan Russia
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Metal-metal bonding and aromaticity in [M2(NHCHNH)3]2 (μ-E)2 (E = O, S; M = Nb, Mo, Tc, Ru, Rh). J Mol Model 2016; 22:48. [PMID: 26825973 DOI: 10.1007/s00894-016-2912-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2015] [Accepted: 01/07/2016] [Indexed: 10/22/2022]
Abstract
The nature of M-M bonding and aromaticity of [M2(NHCHNH)3]2(μ-E)2 (E = O, S; M = Nb, Mo, Tc, Ru, Rh) was investigated using atoms in molecules (AIM) theory, electron localization function (ELF), natural bond orbital (NBO) and molecular orbital analysis. These analyses led to the following main conclusions: in [M2(NHCHNH)3]2(μ-E)2 (E = O, S; M = Nb, Mo, Tc, Ru, Rh), the Nb-Nb, Ru-Ru, and Rh-Rh bonds belong to "metallic" bonds, whereas Mo-Mo and Tc-Tc drifted toward the "dative" side; all these bonds are partially covalent in character. The Nb-Nb, Mo-Mo, and Tc-Tc bonds are stronger than Ru-Ru and Rh-Rh bonds. The M-M bonds in [M2(NHCHNH)3]2(μ-S)2 are stronger than those in [M2(NHCHNH)3]2(μ-O)2 for M = Nb, Mo, Tc, and Ru. The NICS(1)ZZ values show that all of the studied molecules, except [Ru2(NHCHNH)3]2(μ-O)2, are aromaticity molecules. O-bridged compounds have more aromaticity than S-bridged compounds. Graphical Abstract Left Molecular graph, and right electron localization function (ELF) isosurface of [M2(NHCHNH)3]2(μ-E)2(E = O, S; M = Nb, Mo, Tc, Ru, Rh).
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Carrasco M, Mendoza I, Faust M, López-Serrano J, Peloso R, Rodríguez A, Álvarez E, Maya C, Power PP, Carmona E. Terphenyl Complexes of Molybdenum and Tungsten with Quadruple Metal–Metal Bonds and Bridging Carboxylate Ligands. J Am Chem Soc 2014; 136:9173-80. [DOI: 10.1021/ja503750a] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Mario Carrasco
- Instituto
de Investigaciones Químicas (IIQ), Departamento de Química
Inorgánica, Universidad de Sevilla-Consejo Superior de Investigaciones Científicas, Avenida Américo Vespucio 49, 41092 Sevilla, Spain
| | - Irene Mendoza
- Instituto
de Investigaciones Químicas (IIQ), Departamento de Química
Inorgánica, Universidad de Sevilla-Consejo Superior de Investigaciones Científicas, Avenida Américo Vespucio 49, 41092 Sevilla, Spain
| | - Michelle Faust
- Department
of Chemistry, University of California, Davis, One Shields Avenue, Davis, California 95616, United States
| | - Joaquín López-Serrano
- Instituto
de Investigaciones Químicas (IIQ), Departamento de Química
Inorgánica, Universidad de Sevilla-Consejo Superior de Investigaciones Científicas, Avenida Américo Vespucio 49, 41092 Sevilla, Spain
| | - Riccardo Peloso
- Instituto
de Investigaciones Químicas (IIQ), Departamento de Química
Inorgánica, Universidad de Sevilla-Consejo Superior de Investigaciones Científicas, Avenida Américo Vespucio 49, 41092 Sevilla, Spain
| | - Amor Rodríguez
- Instituto
de Investigaciones Químicas (IIQ), Departamento de Química
Inorgánica, Universidad de Sevilla-Consejo Superior de Investigaciones Científicas, Avenida Américo Vespucio 49, 41092 Sevilla, Spain
| | - Eleuterio Álvarez
- Instituto
de Investigaciones Químicas (IIQ), Departamento de Química
Inorgánica, Universidad de Sevilla-Consejo Superior de Investigaciones Científicas, Avenida Américo Vespucio 49, 41092 Sevilla, Spain
| | - Celia Maya
- Instituto
de Investigaciones Químicas (IIQ), Departamento de Química
Inorgánica, Universidad de Sevilla-Consejo Superior de Investigaciones Científicas, Avenida Américo Vespucio 49, 41092 Sevilla, Spain
| | - Philip. P. Power
- Department
of Chemistry, University of California, Davis, One Shields Avenue, Davis, California 95616, United States
| | - Ernesto Carmona
- Instituto
de Investigaciones Químicas (IIQ), Departamento de Química
Inorgánica, Universidad de Sevilla-Consejo Superior de Investigaciones Científicas, Avenida Américo Vespucio 49, 41092 Sevilla, Spain
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Poineau F, Johnstone EV, Weck PF, Kim E, Conradson SD, Sattelberger AP, Czerwinski KR. On the structure of β-molybdenum dichloride. Inorg Chem 2012; 51:4965-71. [PMID: 22497564 DOI: 10.1021/ic202680j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The structure of β-molybdenum dichloride is compared with that of TcCl(2) using EXAFS spectroscopy. For TcCl(2), the Tc atom is surrounded by Tc atoms at 2.13(2), 3.45(3), 3.79(4), and 4.02(4) Å. For β-MoCl(2), the Mo is surrounded by Mo atoms at 2.21(2), 2.91(3), and 3.83(4) Å. The latter distances are consistent with the presence of an [Mo(4)Cl(12)] unit in the solid state, one constituted by two triply Mo-Mo-bonded [Mo(2)Cl(8)] units. First-principles calculations show that β-MoCl(2) with the TcCl(2) "structure type" is less stable than α-MoCl(2) (Mo(6)Cl(12)) or [Mo(4)Cl(12)] edge-sharing clusters.
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Affiliation(s)
- Frederic Poineau
- Department of Chemistry, University of Nevada Las Vegas, Las Vegas, Nevada 89154, USA.
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Hicks J, Ring SP, Patmore NJ. Tuning the electronic structure of Mo–Mo quadruple bonds by N for O for S substitution. Dalton Trans 2012; 41:6641-50. [DOI: 10.1039/c2dt30234a] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Cotton FA, Dalal NS, Kaur N, Murillo CA, Young MD, Zhao Q. A Rare Cyclic Dimolybdenum Triad with Three Weakly Interacting Unpaired Electrons. J CLUST SCI 2010. [DOI: 10.1007/s10876-010-0289-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Chemistry of dimolybdenum complexes containing bridging anions of N,N′-di(3-methoxyphenyl)formamidine. J Mol Struct 2008. [DOI: 10.1016/j.molstruc.2008.01.037] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Donahue JP, Murillo CA. An unusual trigonal D3 assembly composed of molybdate anions and multiply bonded dimolybdenum units. Dalton Trans 2008:1547-51. [DOI: 10.1039/b714814c] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Cotton FA, Li Z, Liu CY, Murillo CA. Enhancement in electronic communication upon replacement of Mo-O by Mo-S bonds in tetranuclear clusters of the type [Mo2]2(mu-E-E)2 (E = O or S). Inorg Chem 2007; 46:9294-302. [PMID: 17910443 DOI: 10.1021/ic701303k] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A tetranuclear cluster containing two quadruply bonded cis-Mo2(DAniF)2 units (DAniF = N,N'-di-p-anisylformamidinate) linked by four hydroxide groups (1) was obtained by hydrolysis of [Mo2(cis-DAniF)2](mu-OCH3)4. Analogous compounds linked by two bidentate bridges (o-O2C6H4 for 2, o-O2C10H6 for 3, and o-S2C6H4 for 4) were synthesized by direct assembly of the corner species precursor [Mo2(cis-DAniF)2(NCCH3)4](BF4)2 and the respective protonated ligands. All four compounds were characterized by X-ray crystallography. Cyclic voltammograms of the O-linked compound 2 and the S analogue 4 show two reversible one-electron-oxidation processes with potential separations (DeltaE(1/2)) of 474 and 776 mV, respectively. The large increase of about 300 mV in DeltaE(1/2) for the S analogue relative to that of the O compound is consistent with a large increase in electronic communication. This enhancement occurs despite the increase of ca. 0.45 A in nonbonding separation between the midpoints of the Mo2 units, which changes from 3.266 A in 2 to 3.72 A in 4, and the increase of ca. 0.4 A in M-E distances as E changes from O to S. Density functional theory calculations show that the increase in electronic communication between the metal centers in 4 is due to a superexchange pathway involving d and p orbitals in the linker E atoms that is less important in 2.
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Affiliation(s)
- F Albert Cotton
- Department of Chemistry, Laboratory for Molecular Structure and Bonding, Texas A&M University, College Station, TX 77842-3012, USA
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Cotton FA, Murillo CA, Zhao Q. A Rare Dimer of Dimers Having Four Hydride Linkers Joining Two Quadruply Bonded Dimolybdenum Units. Inorg Chem 2007; 46:6858-63. [PMID: 17665907 DOI: 10.1021/ic701048d] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Hydride anions, H-, have been found to cause the assembly of dimolybdenum units [Mo2(cis-DAniF)2]2+, DAniF = N,N'-di(p-anisyl)formamidinate, forming a tetranuclear complex [Mo2(cis-DAniF)2]2(mu-H)4 (1) with an Mo4H4 core that may be described as an elongated tetrahedron in which the H atoms are along the four long edges of such tetrahedron and the Mo2 units are along the short edges. The two quadruply bonded dimolybdenum units, separated by only 2.718 A, are essentially orthogonal. This gives the shortest [Mo2]...[Mo2] distance known for complexes with multiple dimolybdenum units. DFT calculations indicate that the energy of a cuboidal isomer is only 3.8 kcal/mol above that of 1, but such an isomer has not been observed.
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Affiliation(s)
- F Albert Cotton
- Department of Chemistry and Laboratory for Molecular Structure and Bonding, P.O. Box 3012, Texas A&M University, College Station, TX 77842-3012, USA
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Cotton FA, Li Z, Murillo CA, Wang X, Yu R, Zhao Q. Crystal-to-Crystal Oxidative Deprotonation of a Di(μ-hydroxo) to a Di(μ-oxo) Dimer of Dimolybdenum Units. Inorg Chem 2007; 46:3245-50. [PMID: 17367130 DOI: 10.1021/ic062443v] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A crystal-to-crystal transformation of (DAniF)3Mo2(micro-OH)2Mo2(DAniF)3 (1) to (DAniF)3Mo2(micro-O)2Mo2(DAniF)3 (2), where DAniF is the anion (p-anisyl)NC(H)N(p-anisyl), by dioxygen provides rare insight into the deprotonation process effected by dioxygen. In this dimolybdenum system, the conversion occurs without significant loss of crystallinity. Although no intermediates have been directly observed, a compound containing the [(DAniF)3Mo2(micro-OH)(micro-O)Mo2(DAniF)3]+ cation, a proposed intermediate, has been obtained independently. Possible pathways for the overall conversion of 1 to 2 are discussed.
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Affiliation(s)
- F Albert Cotton
- Department of Chemistry and Laboratory for Molecular Structure and Bonding, P.O. Box 3012, Texas A&M University, College Station, Texas 77842-3012
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Cotton FA, Liu CY, Murillo CA, Zhao Q. An isomeric pair of fluoride-bridged cyclic dimolybdenum triads. Inorg Chem 2006; 45:9480-6. [PMID: 17083250 DOI: 10.1021/ic061525g] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A pair of isomeric cyclic triads containing three quadruply bonded [Mo2] units, [Mo2(cis-DAniF)2]2+ (DAniF = N,N'-di-p-anisylformamidinate), bridged by six fluoride anions, has been synthesized and crystallographically characterized. For the alpha isomer, the three [Mo2] units are oriented in two orthogonal directions. Two of them are structurally equivalent and parallel to each other, but oriented perpendicular to the third one. The beta isomer is a triangle with three geometrically identical [Mo2] units, parallel to each other, as the vertices. Thus, the beta isomer possesses idealized D3h symmetry while the alpha isomer only has C2v symmetry. These two isomers do not interconvert in boiling THF or toluene or under irradiation with ultraviolet light, but oxidation of the alpha isomer first generates an alpha+ species that changes to beta+. The two isomers have very similar electrochemical behavior, both showing three reversible one-electron redox processes for the [Mo2] centers and similar potential separations (DeltaE(1/2)). The first and second redox couples are well separated (ca. 390-410 mV), while the second and third ones are separated by only about 150 mV.
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Affiliation(s)
- F Albert Cotton
- Department of Chemistry and Laboratory for Molecular Structure and Bonding, P.O. Box 3012, Texas A&M University, College Station, Texas 77842-3012, USA.
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Cotton FA, Murillo CA, Yu R, Zhao Q. A Rare and Highly Oxidized Mo25.5+ Unit Stabilized by Oxo Anions and Supported by Formamidinate Bridges. Inorg Chem 2006; 45:9046-52. [PMID: 17054365 DOI: 10.1021/ic061352v] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A series of tetranuclear compounds consisting of two {Mo2[(m-CF3C6H4)NC(H)N(m-CF3C6H4)]3}n+ moieties linked by two OH- or two O2- ions has been characterized. Abbreviating the dimolybdenum plus three spectator bridging ligands as [Mo2], the following three compounds have been made-[Mo2](mu-OH)2[Mo2] (1), [Mo2](mu-O)2[Mo2] (2), and {[Mo2](mu-O)2[Mo2]}SbF6 (3). Compound 1, which is diamagnetic and contains quadruply bonded Mo2(4+) units, is converted to diamagnetic 2 by oxidation with O2. Compound 2, which has Mo2(5+) units, is oxidized by NOSbF6 to 3 which has a rare Mo2(5.5+) core and an odd electron delocalized over the two dimolybdenum units.
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Affiliation(s)
- F Albert Cotton
- Department of Chemistry and Laboratory for Molecular Structure and Bonding, P.O. Box 3012, Texas A&M University, College Station, Texas 77842-3012, USA.
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Cotton FA, Liu CY, Murillo CA, Zhao Q. Strong Electronic Communication by Direct Metal−Metal Interaction in Molecules with Halide-Bridged Dimolybdenum Pairs. Inorg Chem 2006; 45:9493-501. [PMID: 17083252 DOI: 10.1021/ic061304a] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Reactions of [cis-Mo2(DAniF)2(NCCH3)4](BF4)2, DAniF = N,N'-di-p-anisylformamidinate, with an excess of anhydrous Bu(n)4NX (X = Cl, Br, I), produced the halide-bridged tetranuclear clusters, [cis-Mo2(DAniF)2]2(mu-X)4, X = Cl (1), Br (2), and I (3). All three compounds show two reversible one-electron oxidation processes with potential separations (DeltaE(1/2)) between the two oxidation processes of 540, 499, and 440 mV, respectively. These DeltaE(1/2) values show that the strength of the electronic coupling between the dimetal units decreases as the Mo2...Mo2 distance increases from 1 to 2, and then to 3. The structures, EPR spectra, and near-IR (NIR) spectra of the corresponding mixed-valence species (1-PF6, 2-PF6, and 3-PF6) indicate that the clusters are electronically delocalized. Calculations at the DFT level indicate that the strong electronic communication is principally due to a direct overlap between the delta orbitals from the adjacent dimetal units.
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Affiliation(s)
- F Albert Cotton
- Department of Chemistry, Laboratory for Molecular Structure and Bonding, P.O. Box 30012, Texas A&M University, College Station, Texas 77842-3012, USA
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Cotton FA, Li Z, Liu CY, Murillo CA, Zhao Q. Transition from a nonbonding to a bonding interaction in a tetranuclear [Mo2]2(mu-OR)4 cluster. Inorg Chem 2006; 45:6387-95. [PMID: 16878950 DOI: 10.1021/ic060604p] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Tetranuclear Mo4 clusters with two quadruply bonded Mo2(4+) units, [Mo2(cis-DAniF)2] (DAniF = N,N'-di-p-anisylformamidinate), linked by alkoxides (OCH3 for 1 and OC2H5 for 4) have been prepared. The nonbonding separation between the midpoints of the quadruply bonded units, ca. 3.24 A, is the shortest among compounds having two linked Mo2(4+) units. Electrochemical measurements show two redox waves for each compound with large DeltaE(1/2) values (554 and 587 mV for 1 and 4, respectively) that correspond to K(C) values on the order of 10(9). The large electronic communication is attributed to the short separation between dinuclear units that favor direct delta-to-delta orbital interactions between the two dimetal centers. Compound 1 was chemically oxidized using stoichiometric amounts of ferrocenium salts to a one-electron oxidation product 2 (in which the counteranion is PF6-) and a two-electron oxidation product 3 (which contains two BF4- anions). Upon oxidation there are significant decreases in the distance between the two [Mo2] units to 3.100 A and then to 2.945 A. The mixed-valence species 2 shows two broad absorption bands at 5900 and 7900 cm(-1) in the NIR region which are assigned to the HOMO-1 --> SOMO and HOMO-2 --> SOMO transitions. Compound 3 is fluxional in solution, as shown by variable-temperature 1H NMR spectra. The sharp signals in the NMR spectrum at -50 degrees C and the lack of an EPR signal suggest that this species is diamagnetic and that a four-center, two-electron bond is formed in the cyclometallic Mo4 cluster. To a first-order approximation, an average bond order of 0.25 is assigned to the bonding interaction between the two Mo atoms along the long edges of the rectangle defined by the four Mo atoms.
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Affiliation(s)
- F Albert Cotton
- Department of Chemistry, Laboratory for Molecular Structure and Bonding, P.O. Box 30012, Texas A&M University, College Station, TX 77842-3012, USA.
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Adams RD, Captain B, Hollandsworth CB, Johansson M, Smith JL. Synthesis and Structures of Oxo-Bridged Distannyl- and Digermyldirhenium Complexes. Organometallics 2006. [DOI: 10.1021/om060375e] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Richard D. Adams
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208
| | - Burjor Captain
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208
| | - Carl B. Hollandsworth
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208
| | - Mikael Johansson
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208
| | - Jack L. Smith
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208
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Cotton FA, Murillo CA, Villagrán D, Yu R. Uniquely Strong Electronic Communication between [Mo2] Units Linked by Dioxolene Dianions. J Am Chem Soc 2006; 128:3281-90. [PMID: 16522110 DOI: 10.1021/ja0582962] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Unprecedented strong electronic communication has been found in dimolybdenum pairs containing quadruply bonded Mo2(DAniF)3(+) (DAniF = N,N'-di-p-anisylformamidinate) units linked by dioxolene (C6X2O4(2-)) anions. The neutral compounds [Mo2(DAniF)3]2(C6X2O4) (1, X = H; 2, X = Cl; 3, X = NO2) and the singly oxidized products {[Mo2(DAniF)3]2(C6X2O4)Mo2}PF6 (4, X = H; 5, X = Cl) have been synthesized and characterized by X-ray crystallography and spectroscopic methods. Unusually short Mo-O distances (approximately 2.05 A for 1 and 2, and approximately 2.01 A for 4 and 5) are implicated in the remarkably strong interaction between [Mo2] units via the linkers. This leads to an extensive charge delocalization in the mixed-valence species, which is mediated by the dioxolene linker, as revealed by the large deltaE(1/2) values (763, 795, and 816 mV for 1, 2, and 3, respectively). Additional evidence for the strong electronic coupling is provided by UV-vis, NIR, and EPR spectroscopies and DFT calculations.
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Affiliation(s)
- F Albert Cotton
- Department of Chemistry and Laboratory for Molecular Structure and Bonding, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, USA.
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Cotton FA, Donahue JP, Huang P, Murillo CA, Villagrán D. Strong Electronic Coupling between Mo2n+ Units: The Oxidation Products of [Mo2(DAniF)3]2(μ−H)2 and Mo2(DAniF)4. Z Anorg Allg Chem 2005. [DOI: 10.1002/zaac.200500135] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Chisholm MH, Macintosh AM. Linking Multiple Bonds between Metal Atoms: Clusters, Dimers of “Dimers”, and Higher Ordered Assemblies. Chem Rev 2005; 105:2949-76. [PMID: 16092824 DOI: 10.1021/cr980024c] [Citation(s) in RCA: 121] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Malcolm H Chisholm
- Department of Chemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210-1185, USA.
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Berry JF, Cotton FA, Daniels LM, Murillo CA. A trinickel dipyridylamido complex with metal-metal bonding interaction: prelude to polynickel molecular wires and devices? J Am Chem Soc 2002; 124:3212-3. [PMID: 11916397 DOI: 10.1021/ja025543i] [Citation(s) in RCA: 122] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The molecule Ni(3)(dpa)(4)Cl(2) (1) can be oxidized by AgPF(6) to give crystalline Ni(3)(dpa)(4)(PF(6))(3) (2) (dpa is the anion of di(2-pyridyl)amine). This reversible oxidation occurs at a potential of 0.908 V vs Ag/AgCl electrochemically. The X-ray structure of 2 shows that the oxidation causes a major structural change (even though it is reversible), namely, a contraction of the Ni-Ni distances from ca. 2.43 A to 2.284[1] A. In addition, the electronic structure changes so that from four unpaired electrons in 1 there is only one in 2. From these remarkable results, it is inferred that while 1, and all higher homologues with 5, 7, 9,... nickel atoms are poor electronic conductors, the cations obtainable from them may be much better ones. This in turn means that by controlling the oxidation state electrochemically, these molecules may be able to function as nanoscale diodes.
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Affiliation(s)
- John F Berry
- Department of Chemistry and Laboratory for Molecular Structure and Bonding, P.O. Box 30012, Texas A&M University, College Station, Texas 77842-3012, USA
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Kuang SM, Fanwick PE, Walton RA. The incorporation of the quadruply bonded dimolybdenum(II) unit into an unusual 2-D polymeric assembly through the use of the asymmetric [4-Ph2P(O)C6H4CO2]− ligand that provides both equatorial and axial donor sites. INORG CHEM COMMUN 2002. [DOI: 10.1016/s1387-7003(01)00362-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Bera JK, Angaridis P, Cotton FA, Petrukhina MA, Fanwick PE, Walton RA. Incorporating Multiply Bonded Dirhenium Species [Re2]n+ (n = 4 or 5) into Assemblies Containing Two or More Such Units. J Am Chem Soc 2001. [DOI: 10.1021/ja003589a] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jitendra K. Bera
- Department of Chemistry, Purdue University 1393 Herbert C. Brown Laboratory West Lafayette, Indiana 47907-1393 The Laboratory for Molecular Structure and Bonding and Department of Chemistry, P.O. Box 30012 Texas A & M University, College Station, Texas 77842-3012
| | - Panagiotis Angaridis
- Department of Chemistry, Purdue University 1393 Herbert C. Brown Laboratory West Lafayette, Indiana 47907-1393 The Laboratory for Molecular Structure and Bonding and Department of Chemistry, P.O. Box 30012 Texas A & M University, College Station, Texas 77842-3012
| | - F. Albert Cotton
- Department of Chemistry, Purdue University 1393 Herbert C. Brown Laboratory West Lafayette, Indiana 47907-1393 The Laboratory for Molecular Structure and Bonding and Department of Chemistry, P.O. Box 30012 Texas A & M University, College Station, Texas 77842-3012
| | - Marina A. Petrukhina
- Department of Chemistry, Purdue University 1393 Herbert C. Brown Laboratory West Lafayette, Indiana 47907-1393 The Laboratory for Molecular Structure and Bonding and Department of Chemistry, P.O. Box 30012 Texas A & M University, College Station, Texas 77842-3012
| | - Phillip E. Fanwick
- Department of Chemistry, Purdue University 1393 Herbert C. Brown Laboratory West Lafayette, Indiana 47907-1393 The Laboratory for Molecular Structure and Bonding and Department of Chemistry, P.O. Box 30012 Texas A & M University, College Station, Texas 77842-3012
| | - Richard A. Walton
- Department of Chemistry, Purdue University 1393 Herbert C. Brown Laboratory West Lafayette, Indiana 47907-1393 The Laboratory for Molecular Structure and Bonding and Department of Chemistry, P.O. Box 30012 Texas A & M University, College Station, Texas 77842-3012
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Kuang SM, Fanwick PE, Walton RA. Involvement of multiply bonded dirhenium complexes in mixed-metal assemblies. Isolation and characterization of a new type of Re4Pd2 cluster. Inorg Chem 2000; 39:2968-9. [PMID: 11196890 DOI: 10.1021/ic000250g] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- S M Kuang
- Department of Chemistry, Purdue University, 1393 Brown Building, West Lafayette, Indiana 47907-1393, USA
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