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Rudenco O, Lupan A, Silaghi-Dumitrescu R, King RB. Decarbonylation Products of Binuclear Methylphosphinidene Complexes of Cyclopentadienyliron Carbonyls: Triplet and Quintet Structures Are Favored Energetically over Singlet Structures with Iron-Iron Multiple Bonding. ACS OMEGA 2024; 9:12125-12134. [PMID: 38496963 PMCID: PMC10938326 DOI: 10.1021/acsomega.3c10460] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/28/2023] [Revised: 02/07/2024] [Accepted: 02/14/2024] [Indexed: 03/19/2024]
Abstract
The structures, energetics, and energetically preferred spin states of methylphosphinidene-bridged binuclear cyclopentadienyliron carbonyl complexes MePFe2(CO)nCp2 (n = 4, 3, 2, and 1) related to the experimentally known (μ-RP)Fe2(μ-CO)(CO)2Cp2 (R = cyclohexyl, phenyl, mesityl, and 2,4,6-tBu3C6H2) complexes have been investigated by density functional theory. Singlet structures having a pyramidal pseudotetrahedral phosphorus environment with 18-electron iron configurations are energetically preferred in the tricarbonyl and tetracarbonyl systems MePFe2(CO)nCp2 (n = 4 and 3) with the lowest energy structures of the tricarbonyl very closely resembling the experimentally determined structures. For the more unsaturated dicarbonyl and monocarbonyl systems MePFe2(CO)nCp2 (n = 2 and 1), higher spin state triplet and quintet structures are energetically preferred over singlet structures. These more highly unsaturated structures can be derived from the lowest energy singlet MePFe2(CO)nCp2 (n = 4, 3) by the removal of carbonyl groups. The iron atoms giving up carbonyl groups in their 16- and 14-electron configurations bear the spin density of the unpaired electrons in the higher spin states. The lowest energy singlet structure of the monocarbonyl MePFe2(CO)Cp2, although a relatively high energy isomer, is unusual among the collection of MePFe2(CO)nCp2 (n = 4, 3, 2, and 1) structures by having both the formal Fe=Fe double bond and the four-electron donor MeP unit with the planar phosphorus coordination required to allow each of its iron atoms to attain the favored 18-electron configuration.
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Affiliation(s)
- Oleg Rudenco
- Faculty
of Chemistry and Chemical Engineering, Babeş-Bolyai
University, Cluj-Napoca 400347, Romania
| | - Alexandru Lupan
- Faculty
of Chemistry and Chemical Engineering, Babeş-Bolyai
University, Cluj-Napoca 400347, Romania
| | - Radu Silaghi-Dumitrescu
- Faculty
of Chemistry and Chemical Engineering, Babeş-Bolyai
University, Cluj-Napoca 400347, Romania
| | - R. Bruce King
- Department
of Chemistry, University of Georgia, Athens, Georgia 30602, United States
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Sinhababu S, Mankad NP. Diverse Thermal and Photochemical Reactivity of an Al–Fe Bonded Heterobimetallic Complex. Organometallics 2022. [DOI: 10.1021/acs.organomet.2c00280] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Soumen Sinhababu
- Department of Chemistry, University of Illinois at Chicago, 845 W. Taylor Street, Chicago, Illinois 60607, United States
| | - Neal P. Mankad
- Department of Chemistry, University of Illinois at Chicago, 845 W. Taylor Street, Chicago, Illinois 60607, United States
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3
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Casella G, Carlotto S, Belpassi L, Sambi M, Casarin M. Donation and back-donation in cis- and trans-[(η5-C5H5)Fe(η1-CO)(μ-CO)]2 tautomers: Which relative is more generous? An ETS-NOCV bond analysis. Inorganica Chim Acta 2022. [DOI: 10.1016/j.ica.2022.120897] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Bălăiu C, Lupan A, Bruce King R. Combining a Weak-Field Rigid Chelating Bidentate Dicarbene Ligand with a Strong- Field Carbonyl Ligand in Binuclear Cyclopentadienyliron Carbonyl Derivatives. Polyhedron 2022. [DOI: 10.1016/j.poly.2022.115778] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Carlotto S, Casella G, Sambi M, Casarin M. cis-[(η 5-C 5H 5)Fe(η 1-CO)(μ-CO)] 2, the poor relative between cis and trans tautomers. A theoretical study of the gas-phase Fe L 3-edge and C and O K-edge XAS of trans-/ cis-[(η 5-C 5H 5)Fe(η 1-CO)(μ-CO)] 2. Phys Chem Chem Phys 2021; 23:24661-24668. [PMID: 34704581 DOI: 10.1039/d1cp04105c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The relative stability of trans-[(η5-C5H5)Fe(η1-CO)(μ-CO)]2 (trans-I) and cis-I tautomers in a vacuum and in solvents with different dielectric constants (ε) has been investigated by exploiting density functional theory (DFT). Theoretical results indicate that, in agreement with experimental evidence, trans-I is more stable than cis-I in a vacuum (∼1.5 kcal mol-1; ε = 1), while the opposite is true in media with ε > 7. Differently from solution, DFT outcomes pertaining to the vapor-phase cis-I ⇆ trans-I equilibrium at T = 368 K, the temperature at which the Fe L2,3-edges and the C and O K-edge X-ray absorption spectroscopy (XAS) data of I have been recorded, ultimately indicate the trans-I predominance (∼93%). Compositions, oscillator strengths (f) and excitation energy (EE) values of cis-I transitions substantially mirror those of trans-I; nevertheless, the weighted cis-If(EE) distributions negligibly contribute to the diverse simulated XA spectra of I.
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Affiliation(s)
- Silvia Carlotto
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, Via Francesco Marzolo 1, 35131 Padova, Italy. .,Institute of Condensed Matter Chemistry and Technologies for Energy (ICMATE), National Research Council (CNR), c/o Department of Chemistry, University of Padova, via Francesco. Marzolo 1, 35131 Padova, Italy
| | - Girolamo Casella
- Dipartimento di Scienze della Terra e del Mare, Università degli Studi di Palermo, Via Archirafi, 22, 90123 Palermo, Italy
| | - Mauro Sambi
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, Via Francesco Marzolo 1, 35131 Padova, Italy. .,Consorzio INSTM, Unità di Ricerca di Padova, Via Francesco Marzolo 1, 35131 Padova, Italy
| | - Maurizio Casarin
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, Via Francesco Marzolo 1, 35131 Padova, Italy. .,Institute of Condensed Matter Chemistry and Technologies for Energy (ICMATE), National Research Council (CNR), c/o Department of Chemistry, University of Padova, via Francesco. Marzolo 1, 35131 Padova, Italy
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Zhang K, Zheng H, Li M, Cheng Y, Zhao X. How Can the η 1-Type Fullerene-Metal Bond Survive? A Systematic Survey of Reactions between Mono-EMFs and (M'L n) 2 Dimers. Inorg Chem 2021; 60:11287-11296. [PMID: 34286976 DOI: 10.1021/acs.inorgchem.1c01271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Recently, one η1-coordinated complex of endohedral metallofullerene (EMF) Y@C2v(9)-C82[Re(CO)5] has been synthesized and characterized with a highly efficient radical-coupling methodology by performing a photochemical reaction between Y@C2v(9)-C82 and [Re(CO)5]2 complexes. Theoretical investigations with the density functional theory reveal that this complex is stabilized by an ionic C-Re bond. The reactions of M@C2v(9)-C82 (M = Sc, Y, La) with [Re(CO)5]2 suggest that the reaction energies differ little because of similar single occupied molecular orbitals (SOMOs) of M@C2v(9)-C82. In the reactions of Y@C2v(9)-C82 with various transition-metal complexes [M'Ln]2 (M' = Mn, Tc, Re, Fe, Ru, Os, Co, Rh, Ir), the C-M' bonds with Mn, Tc, Re, Fe, Ru, and Os can stably exist, whereas those with Co, Rh, and Ir are unstable. Further analyses disclose that, in each element group, the stability of the C-M' bond is mainly determined by the bond energy of the M'-M' bond, which is related to the dσ orbital of the M'Ln species. Moreover, the very-low-energy dσ orbitals and large geometrical distortions of M'(CO)4 (M' = Co, Rh, Ir) lead to poor stabilities of the C-M' (M' = Co, Rh, Ir) bonds. As comparison, the reactions of Y@Cs(6)-C82 and La@C72 have been investigated. The Y@Cs(6)-C82 structure is more reactive toward the [M'Ln]2 complexes than Y@C2v(9)-C82 thanks to a lower SOMO of Y@Cs(6)-C82 than that of Y@C2v(9)-C82, which derives from position change of the Y atom in Cs(6)-C82 during the reactions. However, the formation of [Y@Cs(6)-C82]2 suppresses the formation of several C-M' bonds. The reactivity of La@C72 is weak due to a high LUMO+1 of C72, which leads to a high SOMO of La@C72. We believe that this theoretical study provides primary principles of radical-coupling reactions of EMFs and will be valuable for future research of organometallic complexes of fullerene.
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Affiliation(s)
- KaiNi Zhang
- Institute of Molecular Science & Applied Chemistry, School of Chemistry, MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Xi'an Jiaotong University, Xi'an 710049, China
| | - Hong Zheng
- State key Laboratory of Electrical Insulation and Power Equipment, Center of Nanomaterials for Renewable Energy, School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Mengyang Li
- Institute of Molecular Science & Applied Chemistry, School of Chemistry, MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Xi'an Jiaotong University, Xi'an 710049, China
| | - Yonghong Cheng
- State key Laboratory of Electrical Insulation and Power Equipment, Center of Nanomaterials for Renewable Energy, School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Xiang Zhao
- Institute of Molecular Science & Applied Chemistry, School of Chemistry, MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Xi'an Jiaotong University, Xi'an 710049, China
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Yu HC, Telser J, Mankad NP. Synthesis and Characterization of Heteromultinuclear Ni/M Clusters (M = Fe, Ru, W) Including a Paramagnetic (NHC)Ni–WCp*(CO)3 Heterobinuclear Complex. Organometallics 2021; 40:2123-2132. [DOI: 10.1021/acs.organomet.1c00263] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hsien-Cheng Yu
- Department of Chemistry, University of Illinois at Chicago, 845 W. Taylor Street, Chicago, Illinois 60607, United States
| | - Joshua Telser
- Department of Biological, Physical and Health Sciences, Roosevelt University, Chicago, Illinois 60605, United States
| | - Neal P. Mankad
- Department of Chemistry, University of Illinois at Chicago, 845 W. Taylor Street, Chicago, Illinois 60607, United States
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Hujon F, Lyngdoh RHD, King RB. Iron‐Iron Bond Lengths and Bond Orders in Diiron Lantern‐Type Complexes with High Spin Ground States. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202000897] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Fitzerald Hujon
- Department of Chemistry North-Eastern Hill University Shillong 793 022 India
| | | | - R. Bruce King
- Center for Computational Quantum Chemistry University of Georgia Athens 30602 United States
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Li X, Zhu Y, Li N, King RB. Binuclear heterometallic bonding between a first row transition metal and a second row transition metal: The cyclopentadienyliron molybdenum carbonyls Cp2FeMo(CO) (n = 6, 5, 4, 3, 2). Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2019.04.044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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10
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Carlotto S, Finetti P, de Simone M, Coreno M, Casella G, Sambi M, Casarin M. Comparative Experimental and Theoretical Study of the Fe L 2,3-Edges X-ray Absorption Spectroscopy in Three Highly Popular, Low-Spin Organoiron Complexes: [Fe(CO) 5], [(η 5-C 5H 5)Fe(CO)(μ-CO)] 2, and [(η 5-C 5H 5) 2Fe]. Inorg Chem 2019; 58:5844-5857. [PMID: 30998004 DOI: 10.1021/acs.inorgchem.9b00226] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The occupied and unoccupied electronic structures of three highly popular, closed shell organoiron complexes ([Fe(CO)5], [(η5-C5H5)Fe(CO)(μ-CO)]2, and [(η5-C5H5)2Fe]) have been theoretically investigated by taking advantage of density functional theory (DFT) calculations coupled to the isolobal analogy ( Elian et al. Inorg. Chem. 1976 , 15 , 1148 ). The adopted approach allowed us to look into the relative role played by the ligand → Fe donation and the Fe → ligand back-donation in title molecules, as well as to investigate how CO- (terminal or bridging) and [(η5-C5H5)]--based π* orbitals compete when these two ligands are simultaneously present as in [(η5-C5H5)Fe(CO)(μ-CO)]2. Insights into the nature and the strength of the bonding between Fe and the C donor atoms have been gained by exploiting the Nalewajski-Mrozek bond multiplicity index ( Nalewajski et al. Int. J. Quantum Chem. 1994 , 51 , 187 ), which have been found especially sensitive even to tiny bond distance variations. The bonding picture emerging from ground state DFT results proved fruitful to guide the assignment of original, high-resolution, gas-phase L2,3-edges X-ray absorption spectra of the title molecules, which have been modeled by the two-component relativistic time-dependent DFT including spin orbit coupling and correlation effects and taking advantage of the full use of symmetry. Assignments alternative to those reported in the literature for both [Fe(CO)5] and [(η5-C5H5)2Fe] are herein proposed. Despite the high popularity of the investigated molecules, the complementary use of symmetry, orbital, and spectroscopy allowed us to further look into the metal-ligand symmetry-restricted-covalency and the differential-orbital covalency, which characterize them.
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Affiliation(s)
- Silvia Carlotto
- Dipartimento di Scienze Chimiche , Università degli Studi di Padova , Via Francesco Marzolo 1 , 35131 Padova , Italy
| | - Paola Finetti
- Dipartimento di Scienze e Metodi dell'Ingegneria , Università di Modena , Via Università 4 , 41121 Modena , Italy
| | | | | | - Girolamo Casella
- Dipartimento di Scienze della Terra e del Mare , Università degli Studi di Palermo , Via Archirafi 22 , 90123 Palermo , Italy
| | - Mauro Sambi
- Dipartimento di Scienze Chimiche , Università degli Studi di Padova , Via Francesco Marzolo 1 , 35131 Padova , Italy
| | - Maurizio Casarin
- Dipartimento di Scienze Chimiche , Università degli Studi di Padova , Via Francesco Marzolo 1 , 35131 Padova , Italy.,CNR - ICMATE , Via Francesco Marzolo 1 , 35131 Padova , Italy
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11
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Duncan Lyngdoh RH, Schaefer HF, King RB. Metal-Metal (MM) Bond Distances and Bond Orders in Binuclear Metal Complexes of the First Row Transition Metals Titanium Through Zinc. Chem Rev 2018; 118:11626-11706. [PMID: 30543419 DOI: 10.1021/acs.chemrev.8b00297] [Citation(s) in RCA: 85] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This survey of metal-metal (MM) bond distances in binuclear complexes of the first row 3d-block elements reviews experimental and computational research on a wide range of such systems. The metals surveyed are titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, and zinc, representing the only comprehensive presentation of such results to date. Factors impacting MM bond lengths that are discussed here include (a) the formal MM bond order, (b) size of the metal ion present in the bimetallic core (M2) n+, (c) the metal oxidation state, (d) effects of ligand basicity, coordination mode and number, and (e) steric effects of bulky ligands. Correlations between experimental and computational findings are examined wherever possible, often yielding good agreement for MM bond lengths. The formal bond order provides a key basis for assessing experimental and computationally derived MM bond lengths. The effects of change in the metal upon MM bond length ranges in binuclear complexes suggest trends for single, double, triple, and quadruple MM bonds which are related to the available information on metal atomic radii. It emerges that while specific factors for a limited range of complexes are found to have their expected impact in many cases, the assessment of the net effect of these factors is challenging. The combination of experimental and computational results leads us to propose for the first time the ranges and "best" estimates for MM bond distances of all types (Ti-Ti through Zn-Zn, single through quintuple).
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Affiliation(s)
| | - Henry F Schaefer
- Centre for Computational Quantum Chemistry , University of Georgia , Athens , Georgia 30602 , United States
| | - R Bruce King
- Centre for Computational Quantum Chemistry , University of Georgia , Athens , Georgia 30602 , United States
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Konarev DV, Kuzmin AV, Batov MS, Khasanov SS, Otsuka A, Yamochi H, Kitagawa H, Lyubovskaya RN. {CpFe II(CO) 2Sn II(Macrocycle •3-)} Radicals with Intrinsic Charge Transfer from CpFe(CO) 2 to Macrocycles (Cp: Cp or Cp*); Effective Magnetic Coupling between Radical Trianionic Macrocycles •3. ACS OMEGA 2018; 3:14875-14888. [PMID: 31458154 PMCID: PMC6644027 DOI: 10.1021/acsomega.8b02221] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/30/2018] [Accepted: 10/22/2018] [Indexed: 06/10/2023]
Abstract
Neutral {CpFeII(CO)2[SnII(Pc•3-)]} {Cp is cyclopentadienyl (1, 2) or Cp* is pentamethylcyclopentadienyl (3); Pc: phthalocyanine}, {Cp*FeII(CO)2[SnII(Nc•3-)]} (4, Nc: naphthalocyanine), and {CpFeII(CO)2[SnII(TPP•3-)]} (5, TPP: tetraphenylporphyrin) complexes in which CpFeII(CO)2 fragments (Cp: Cp or Cp*) are coordinated to SnII(macrocycle•3-) have been obtained. The product complexes were obtained at the reaction of charge transfer from CpFeI(CO)2 (Cp: Cp or Cp*) to [SnII(macrocycle2-)] to form the diamagnetic FeII and paramagnetic radical trianionic macrocycles. As a result, these formally neutral complexes contain S = 1/2 spins delocalized over the macrocycles. This provides alternation of the C-Nimine or C-Cmeso bonds in the macrocycles, the appearance of new bands in the near-infrared spectra of the complexes, and blue shift of both Soret and Q-bands. The {CpFeII(CO)2SnII(macrocycle•3-)} units (Cp: Cp or Cp*, macrocycle: Pc or Nc) form closely packed π-stacking dimers in 1 and 3 or one-dimensional chains in 2 and 4 with effective π-π interaction between the macrocycles. Such packing allows strong antiferromagnetic coupling between S = 1/2 spins. Magnetic interaction can be described well by the Heisenberg model for the isolated dimers in 1 and 3 with exchange interaction J/k B = -78 and -85 K, respectively. Magnetic behavior of 2 and 4 is described well by the model that includes contributions from an antiferromagnetically coupled S = 1/2 dimer (J intra) and a Heisenberg S = 1/2 chain with alternating antiferromagnetic spin exchange between the neighbors (J inter). Compound 2 demonstrates large intradimer interaction of J intra/k B = -54 K and essentially weaker interdimer exchange interactions of J inter/k B = -6 K, whereas compound 4 shows strong magnetic coupling of spins within the dimers (J intra/k B = -170 K) as well as between the dimers (J inter/k B = -40 K). Compound {CpFeII(CO)2[SnII(TPP•3-)]} (5) shows no π-π interactions between the porphyrin macrocycles, and magnetic coupling is weak in this case (Weiss temperature is -5 K). Preparation of a similar complex with indium(III) chloride phthalocyanine yields {CpFe(CO)2[In(Pc2-)]} (6). In this complex, indium(III) atoms are reduced instead of the phthalocyanine macrocycles that explains electron paramagnetic resonance silence of 6 in the 4-295 K range.
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Affiliation(s)
- Dmitri V. Konarev
- Institute
of Problems of Chemical Physics RAS, Chernogolovka, Moscow Region 142432, Russia
| | - Alexey V. Kuzmin
- Institute
of Solid State Physics RAS, Chernogolovka, Moscow Region 142432, Russia
| | - Mikhail S. Batov
- Institute
of Problems of Chemical Physics RAS, Chernogolovka, Moscow Region 142432, Russia
- Lomonosov
Moscow State University, Leninskie Gory, Moscow 119991, Russia
| | - Salavat S. Khasanov
- Institute
of Solid State Physics RAS, Chernogolovka, Moscow Region 142432, Russia
| | - Akihiro Otsuka
- Division
of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
- Research
Center for Low Temperature and Materials Sciences, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| | - Hideki Yamochi
- Division
of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
- Research
Center for Low Temperature and Materials Sciences, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| | - Hiroshi Kitagawa
- Division
of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Rimma N. Lyubovskaya
- Institute
of Problems of Chemical Physics RAS, Chernogolovka, Moscow Region 142432, Russia
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Gong S, Chen G, Li QS, Luo Q, Xie Y, King RB. Cyclopentadienyliron boronyl carbonyls as isoelectronic analogues of cyclopentadienylmanganese carbonyls except for boronyl ligand coupling reactions. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2017.07.063] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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14
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Kositzki R, Mebs S, Schuth N, Leidel N, Schwartz L, Karnahl M, Wittkamp F, Daunke D, Grohmann A, Apfel UP, Gloaguen F, Ott S, Haumann M. Electronic and molecular structure relations in diiron compounds mimicking the [FeFe]-hydrogenase active site studied by X-ray spectroscopy and quantum chemistry. Dalton Trans 2017; 46:12544-12557. [PMID: 28905949 DOI: 10.1039/c7dt02720f] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Synthetic diiron compounds of the general formula Fe2(μ-S2R)(CO)n(L)6-n (R = alkyl or aromatic groups; L = CN- or phosphines) are versatile models for the active-site cofactor of hydrogen turnover in [FeFe]-hydrogenases. A series of 18 diiron compounds, containing mostly a dithiolate bridge and terminal ligands of increasing complexity, was characterized by X-ray absorption and emission spectroscopy in combination with density functional theory. Fe K-edge absorption and Kβ main-line emission spectra revealed the varying geometry and the low-spin state of the Fe(i) centers. Good agreement between experimental and calculated core-to-valence-excitation absorption and radiative valence-to-core-decay emission spectra revealed correlations between spectroscopic and structural features and provided access to the electronic configuration. Four main effects on the diiron core were identified, which were preferentially related to variation either of the dithiolate or of the terminal ligands. Alteration of the dithiolate bridge affected mainly the Fe-Fe bond strength, while more potent donor substitution and ligand field asymmetrization changed the metal charge and valence level localization. In contrast, cyanide ligation altered all relevant properties and, in particular, the frontier molecular orbital energies of the diiron core. Mutual benchmarking of experimental and theoretical parameters provides guidelines to verify the electronic properties of related diiron compounds.
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Affiliation(s)
- Ramona Kositzki
- Freie Universität Berlin, Fachbereich Physik, 14195 Berlin, Germany.
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Competition between phosphorus lone pairs and ring π-systems in binding to transition metals: Binuclear diphosphacyclobutadiene cobalt carbonyl derivatives. Inorganica Chim Acta 2017. [DOI: 10.1016/j.ica.2016.10.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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16
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Tan J, Gong S, Deng J, Li Q, Luo Q, Xie Y, King RB. Energetic preference of dative fluorine manganese bonds over direct manganese manganese bonds in binuclear hexafluorocyclopentadiene manganese carbonyls. J Fluor Chem 2016. [DOI: 10.1016/j.jfluchem.2016.06.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Chen X, Yuan L, Ren G, Xi Q, Jin R, Du Q, Feng H, Xie Y, Bruce King R. Binuclear phospholyl iron carbonyls: The limited role of the phosphorus atom in metal complexation. Inorganica Chim Acta 2016. [DOI: 10.1016/j.ica.2016.02.017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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18
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Feng X, Li N, Lv L, King RB. Unsaturation in binuclear heterometallic carbonyls: the cyclopentadienyliron manganese carbonyl CpFeMn(CO)n system as a hybrid of the Cp2Fe2(CO)n and Mn2(CO)n systems. NEW J CHEM 2016. [DOI: 10.1039/c5nj03459k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The structures and energetics of the CpFeMn(CO)n (n = 7, 6, 5) have been examined by density functional theory.
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Affiliation(s)
- Xiuli Feng
- State Key Laboratory of Explosion Science and Technology
- School of Mechatronical Engineering
- Beijing Institute of Technology
- Beijing 100081
- P. R. China
| | - Nan Li
- State Key Laboratory of Explosion Science and Technology
- School of Mechatronical Engineering
- Beijing Institute of Technology
- Beijing 100081
- P. R. China
| | - Liqiang Lv
- College of Chemical Engineering
- Shijiazhuang University
- Shijiazhuang 050035
- P. R. China
| | - R. Bruce King
- Department of Chemistry and Center for Computational Chemistry
- University of Georgia
- Athens
- USA
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The Covalent Bond Classification Method and Its Application to Compounds That Feature 3-Center 2-Electron Bonds. THE CHEMICAL BOND III 2016. [DOI: 10.1007/430_2015_206] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Ding S, Hall MB. The Rich Structural Chemistry Displayed by the Carbon Monoxide as a Ligand to Metal Complexes. THE CHEMICAL BOND I 2016. [DOI: 10.1007/430_2015_208] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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21
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Gong S, Luo Q, Li QS, Xie Y, Bruce King R, Schaefer III HF. Major differences between trifluorophosphine and carbonyl ligands in binuclear cyclopentadienyliron complexes. NEW J CHEM 2015. [DOI: 10.1039/c4nj02348j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
No low-energy Cp2Fe2(PF3)nstructures have bridging PF3ligands. Bridging μ-PF2groups are found combined with terminal F or PF4ligands.
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Affiliation(s)
- Shida Gong
- MOE Key Laboratory of Theoretical Chemistry of Environment
- Center for Computational Quantum Chemistry
- South China Normal University
- Guangzhou 510631
- P. R. China
| | - Qiong Luo
- MOE Key Laboratory of Theoretical Chemistry of Environment
- Center for Computational Quantum Chemistry
- South China Normal University
- Guangzhou 510631
- P. R. China
| | - Qian-shu Li
- MOE Key Laboratory of Theoretical Chemistry of Environment
- Center for Computational Quantum Chemistry
- South China Normal University
- Guangzhou 510631
- P. R. China
| | - Yaoming Xie
- Department of Chemistry and Center for Computational Chemistry
- University of Georgia
- Athens
- USA
| | - R. Bruce King
- MOE Key Laboratory of Theoretical Chemistry of Environment
- Center for Computational Quantum Chemistry
- South China Normal University
- Guangzhou 510631
- P. R. China
| | - Henry F. Schaefer III
- Department of Chemistry and Center for Computational Chemistry
- University of Georgia
- Athens
- USA
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Chen J, Liu Z, Feng H, Xie Y, Bruce King R. Binuclear 1,2-diaza-3,5-diborolyl iron carbonyls: Effect of replacing ring CC units with isoelectronic BN units. Inorganica Chim Acta 2015. [DOI: 10.1016/j.ica.2014.09.037] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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23
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Duan L, Peng B, Luo Q, Li QS, Xie Y, King RB. Diverse bonding modes and coupling reactions of the boronyl ligand in binuclear cyclopentadienyl cobalt derivatives: Analogies with isoelectronic binuclear cyclopentadienyliron carbonyls. J Organomet Chem 2014. [DOI: 10.1016/j.jorganchem.2013.09.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Deng J, Li QS, Xie Y, King RB. Binuclear pentafluorocyclopentadienyl metal carbonyls of iron, cobalt, and nickel: Effect of fluorine substitution. J Fluor Chem 2013. [DOI: 10.1016/j.jfluchem.2013.05.029] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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26
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Lin W, Liu C, Wang Y, Lee G. Crystal and Molecular Structure of Carbonyl (1,1,4,4-Tetrafluoro-2-tert-Butyl-1,4-Disilabut-2-Ene) (η5-Cyclopentadienyl) Cobalt (II). J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.198500043] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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The fluorophosphinidene ligand in cyclopentadienyliron carbonyl chemistry: Iron–iron multiple bonding versus higher spin states. Inorganica Chim Acta 2013. [DOI: 10.1016/j.ica.2013.01.038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Wang C, Zhang X, Bai Y, Gao F, Li Q. High-spin binuclear cyclopentadienyliron chlorides: a density functional theory study. J Mol Model 2013; 19:3077-86. [PMID: 23595311 DOI: 10.1007/s00894-013-1826-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2012] [Accepted: 03/18/2013] [Indexed: 11/26/2022]
Abstract
Theoretical studies on the cyclopentadienyliron chlorides Cp2Fe2Cl(n) (n = 6 - 1) with iron in the formal oxidation states from +1 to +4 indicate that all the high-spin species are predicted to be the lowest energy structures and they are paramagnetic complexes with magnetic moments between 2.8μ(B) and 5.9μ(B). The mixed oxidation state derivatives with odd number of chloride atoms have larger magnetic moments than other species. In addition to Cp2Fe2Cl, which has the largest magnetic moment, these high-spin species have terminal Cp rings and bridging Cl atoms up to a maximum of two bridges. The Cp2Fe2Cl4, Cp2Fe2Cl3 and Cp2Fe2Cl2 derivatives are predicted to be thermodynamically stable molecules with respect to exothermic reactions for the loss of one Cl atom from Cp2Fe2Cl n . Moreover, the lowest energy Cp2Fe2Cl(n) (n = 3, 4) derivatives can be derived by the oxidative addition reactions of Cp2Fe2Cl(n-2) + Cl2 → Cp2Fe2Cl(n).
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Affiliation(s)
- Congzhi Wang
- Key Laboratory of Cluster Science, Ministry of Education of China, School of Chemistry, Beijing Institute of Technology, Beijing 100081, People's Republic of China
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Deng J, Li QS, Xie Y, King RB, Schaefer, III HF. Binuclear hexafluorocyclopentadiene iron carbonyls: bis(dihapto) versus trihapto–monohapto bonding in iron–iron bonded structures. NEW J CHEM 2013. [DOI: 10.1039/c3nj00311f] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Chen J, Chen S, Liu Z, Feng H, Xie Y, King RB. Terminal versus bridging methylborole ligands and agostic hydrogen atoms in binuclear cobalt carbonyl derivatives. J Organomet Chem 2012. [DOI: 10.1016/j.jorganchem.2012.07.033] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Farrugia LJ, Evans C, Senn HM, Hänninen MM, Sillanpää R. QTAIM View of Metal–Metal Bonding in Di- and Trinuclear Disulfido Carbonyl Clusters. Organometallics 2012. [DOI: 10.1021/om2011744] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Louis J. Farrugia
- WestCHEM, School of Chemistry, University of Glasgow, Glasgow G12 8QQ, Scotland, U.K
| | - Cameron Evans
- WestCHEM, School of Chemistry, University of Glasgow, Glasgow G12 8QQ, Scotland, U.K
| | - Hans Martin Senn
- WestCHEM, School of Chemistry, University of Glasgow, Glasgow G12 8QQ, Scotland, U.K
| | - Mikko M. Hänninen
- Department of Chemistry, University of Jyväskylä, P.O. Box 35, Jyväskylä
FIN-40014, Finland
| | - Reijo Sillanpää
- Department of Chemistry, University of Jyväskylä, P.O. Box 35, Jyväskylä
FIN-40014, Finland
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33
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Green JC, Green MLH, Parkin G. The occurrence and representation of three-centre two-electron bonds in covalent inorganic compounds. Chem Commun (Camb) 2012; 48:11481-503. [DOI: 10.1039/c2cc35304k] [Citation(s) in RCA: 222] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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34
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Farrugia LJ, Senn HM. On the Unusual Weak Intramolecular C...C Interactions in Ru3(CO)12: A Case of Bond Path Artifacts Introduced by the Multipole Model? J Phys Chem A 2011; 116:738-46. [DOI: 10.1021/jp2100039] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Louis J. Farrugia
- WestCHEM, School of Chemistry, University of Glasgow, Glasgow G12 8QQ, Scotland
| | - Hans Martin Senn
- WestCHEM, School of Chemistry, University of Glasgow, Glasgow G12 8QQ, Scotland
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Xu L, Li QS, King RB, Schaefer HF. Coupling of Fluoroborylene Ligands To Give a Viable Cyclopentadienyliron Carbonyl Complex of Difluorodiborene (FB═BF). Organometallics 2011. [DOI: 10.1021/om200657g] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Liancai Xu
- Department of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, People's Republic of China
| | - Qian-shu Li
- Center for Computational Quantum Chemistry, South China Normal University, Guangzhou 510631, People's Republic of China
- Institute of Chemical Physics, Beijing Institute of Technology, Beijing 100081, People's Republic of China
| | - R. Bruce King
- Center for Computational Quantum Chemistry, South China Normal University, Guangzhou 510631, People's Republic of China
- Department of Chemistry and Center for Computational Chemistry, University of Georgia, Athens, Georgia 30602, United States
| | - Henry F. Schaefer
- Department of Chemistry and Center for Computational Chemistry, University of Georgia, Athens, Georgia 30602, United States
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36
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Unsaturation in binuclear cyclopentadienyliron carbonyl thiocarbonyls: Four-electron donor bridging thiocarbonyl groups versus metal–metal multiple bonds. Inorganica Chim Acta 2011. [DOI: 10.1016/j.ica.2011.05.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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37
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Chen MB, Li J, Xu GX. Coordination of neighboring CH bond to transition metal center: III. Study on localized molecular orbitals of the binucleate ion [Fe2(CH3)(CO)(Ph2PCH2PPh2)Cp2]+. ACTA CHIMICA SINICA 2010. [DOI: 10.1002/cjoc.19890070406] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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38
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Farrugia LJ, Senn HM. Metal-metal and metal-ligand bonding at a QTAIM catastrophe: a combined experimental and theoretical charge density study on the alkylidyne cluster Fe3(μ-H)(μ-COMe)(CO)10. J Phys Chem A 2010; 114:13418-33. [PMID: 21182291 DOI: 10.1021/jp1098624] [Citation(s) in RCA: 79] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The charge density in the tri-iron methoxymethylidyne cluster Fe(3)(μ-H)(μ-COMe)(CO)(10) (1) has been studied experimentally at 100 K and by DFT calculations on the isolated molecule using the Quantum Theory of Atoms in Molecules (QTAIM). The COMe ligand acts as a nearly symmetric bridge toward two of the Fe atoms (Fe-C = 1.8554(4), 1.8608(4) Å) but with a much longer interaction to the third Fe atom, Fe-C = 2.6762(4) Å. Complex 1 provides a classic example where topological QTAIM catastrophes render an exact structure description ambiguous. While all experimental and theoretical studies agree in finding no direct metal-metal interaction for the doubly bridged Fe-Fe vector, the chemical bonding between the Fe(CO)(4) unit and the Fe(2)(μ-H)(μ-COMe)(CO)(6) moiety in terms of conventional QTAIM descriptors is much less clear. Bond paths implying direct Fe-Fe interactions and a weak interaction between the COMe ligand and the Fe(CO)(4) center are observed, depending on the experimental or theoretical density model examined. Theoretical studies using the Electron Localizability Indicator (ELI-D) suggest the metal-metal bonding is more significant, while the delocalization indices imply that both Fe-Fe bonding and Fe···C(alkylidyne) bonding are equally important. The source functions at various interfragment reference points are similar and highly delocalized. The potential-energy surface (PES) for the migration of the alkylidyne group from a μ(2) to a semi-μ(3) coordination mode has been explored by DFT calculations on 1 and the model complexes M(3)(μ-H)(μ-CH)(CO)(10) (M = Fe, 2; Ru, 3; and Os, 4). These calculations confirm a semi-μ(3) bridging mode for the alkylidyne ligand as the minimum-energy geometry for compounds 2-4 and demonstrate that, for 1, both Fe-Fe and Fe···C(alkylidyne) interactions are important in the cluster bonding. The PES between μ(2) and semi-μ(3) alkylidyne coordination for 1 is extremely soft, and the interconversion between several topological isomers is predicted to occur with almost no energy cost. Analysis of the density ρ(r) and the Laplacian of the density ▽(2)ρ(r(b)) in the methoxymethylidyne ligand is consistent with a partial π-bond character of the C-O bond, associated with an sp(2) hybridization for these atoms.
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Affiliation(s)
- Louis J Farrugia
- WestCHEM, School of Chemistry, University of Glasgow, Glasgow G12 8QQ, Scotland
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39
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Li G, Li QS, Xie Y, Bruce King R, Schaefer HF. Formation of a four-electron donor carbonyl group in the decarbonylation of the unsaturated H2C2Fe2(CO)6 tetrahedrane as an alternative to an iron–iron triple bond. J Organomet Chem 2010. [DOI: 10.1016/j.jorganchem.2009.10.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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40
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Bond Orders in Metal–Metal Interactions Through Electron Density Analysis. STRUCTURE AND BONDING 2010. [DOI: 10.1007/978-3-642-30802-4_30] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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41
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Casati N, Macchi P, Sironi A. Molecular crystals under high pressure: theoretical and experimental investigations of the solid-solid phase transitions in [Co2(CO)6(XPh3)2] (X = P, As). Chemistry 2009; 15:4446-57. [PMID: 19266520 DOI: 10.1002/chem.200801528] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
An accurate analysis of the solid-state structural transformations occurring in species of the general formula [Co(2)(CO)(6)(XPh(3))(2)] (X = P, As) by experimental X-ray diffraction under non-ambient conditions (on variation of pressure or temperature) and by ab initio theoretical modelling is presented. After a crystal-to-crystal phase transition, the conformation of carbonyl ligands about the Co-Co bond changes from staggered to (almost) eclipsed. The analysis of high-pressure and low-temperature structures sheds light on the peculiar behaviour of the metal-metal bond, the most flexible in the molecule, which is initially compressed, then elongated due to increased intra-carbonyl repulsion and eventually compressed again. Theoretical calculations in the solid state allow the thermodynamic quantities of the transformation to be computed and prediction of the distortions produced by the external stress. The change in molecular symmetry is induced by the increase in the high internal energy associated with the staggered carbonyl conformation, which does not allow efficient packing if the crystalline volume is reduced. The eclipsed conformer, though much less stable in isolation, guarantees better entanglement between molecules.
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Affiliation(s)
- Nicola Casati
- Università di Milano, Dipartimento di Chimica Strutturale e Stereochimica Inorganica via Venezian 21, 20133 Milano, Italy.
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Farrugia LJ, Evans C, Lentz D, Roemer M. The QTAIM Approach to Chemical Bonding Between Transition Metals and Carbocyclic Rings: A Combined Experimental and Theoretical Study of (η5-C5H5)Mn(CO)3, (η6-C6H6)Cr(CO)3, and (E)-{(η5-C5H4)CF═CF(η5-C5H4)}(η5-C5H5)2Fe2. J Am Chem Soc 2008; 131:1251-68. [DOI: 10.1021/ja808303j] [Citation(s) in RCA: 142] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Louis J. Farrugia
- WestCHEM, Department of Chemistry, University of Glasgow, Glasgow G12 8QQ, Scotland, U.K., and Institut für Chemie - Anorganische und Analytische Chemie, Fachbereich Biologie, Chemie, Pharmazie, Freie Universität, D-14195 Berlin, Germany
| | - Cameron Evans
- WestCHEM, Department of Chemistry, University of Glasgow, Glasgow G12 8QQ, Scotland, U.K., and Institut für Chemie - Anorganische und Analytische Chemie, Fachbereich Biologie, Chemie, Pharmazie, Freie Universität, D-14195 Berlin, Germany
| | - Dieter Lentz
- WestCHEM, Department of Chemistry, University of Glasgow, Glasgow G12 8QQ, Scotland, U.K., and Institut für Chemie - Anorganische und Analytische Chemie, Fachbereich Biologie, Chemie, Pharmazie, Freie Universität, D-14195 Berlin, Germany
| | - Max Roemer
- WestCHEM, Department of Chemistry, University of Glasgow, Glasgow G12 8QQ, Scotland, U.K., and Institut für Chemie - Anorganische und Analytische Chemie, Fachbereich Biologie, Chemie, Pharmazie, Freie Universität, D-14195 Berlin, Germany
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43
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Zhang X, Li QS, Xie Y, King RB, Schaefer HF. Dimetallocene carbonyls: The limits of the 18-electron rule and metal–metal multiple bonding in highly unsaturated molecules of the early transition metals. J Mol Struct 2008. [DOI: 10.1016/j.molstruc.2008.03.032] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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44
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Xu B, Li QS, Xie Y, King RB, Schaefer HF. Unsaturated Binuclear Cyclopentadienylosmium Carbonyl Derivatives: Comparison with Their Iron Analogues. Organometallics 2008. [DOI: 10.1021/om800649r] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Bing Xu
- Institute of Chemical Physics, Beijing Institute of Technology, Beijing 100081, Peopleʼs Republic of China, Center for Computational Quantum Chemistry, School of Chemistry and Environment, South China Normal University, Guangzhou 510631, Peopleʼs Republic of China, and Department of Chemistry and Center for Computational Chemistry, University of Georgia, Athens, Georgia 30602
| | - Qian-Shu Li
- Institute of Chemical Physics, Beijing Institute of Technology, Beijing 100081, Peopleʼs Republic of China, Center for Computational Quantum Chemistry, School of Chemistry and Environment, South China Normal University, Guangzhou 510631, Peopleʼs Republic of China, and Department of Chemistry and Center for Computational Chemistry, University of Georgia, Athens, Georgia 30602
| | - Yaoming Xie
- Institute of Chemical Physics, Beijing Institute of Technology, Beijing 100081, Peopleʼs Republic of China, Center for Computational Quantum Chemistry, School of Chemistry and Environment, South China Normal University, Guangzhou 510631, Peopleʼs Republic of China, and Department of Chemistry and Center for Computational Chemistry, University of Georgia, Athens, Georgia 30602
| | - R. Bruce King
- Institute of Chemical Physics, Beijing Institute of Technology, Beijing 100081, Peopleʼs Republic of China, Center for Computational Quantum Chemistry, School of Chemistry and Environment, South China Normal University, Guangzhou 510631, Peopleʼs Republic of China, and Department of Chemistry and Center for Computational Chemistry, University of Georgia, Athens, Georgia 30602
| | - Henry F. Schaefer
- Institute of Chemical Physics, Beijing Institute of Technology, Beijing 100081, Peopleʼs Republic of China, Center for Computational Quantum Chemistry, School of Chemistry and Environment, South China Normal University, Guangzhou 510631, Peopleʼs Republic of China, and Department of Chemistry and Center for Computational Chemistry, University of Georgia, Athens, Georgia 30602
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Formal chromium–chromium triple bonds and bent rings in the binuclear cycloheptatrienylchromium carbonyls (C7H7)2Cr2(CO)n (n=6,5,4,3,2,1,0): A density functional theory study. J Organomet Chem 2008. [DOI: 10.1016/j.jorganchem.2008.06.036] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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46
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Felton GAN, Vannucci AK, Okumura N, Lockett LT, Evans DH, Glass RS, Lichtenberger DL. Hydrogen Generation from Weak Acids: Electrochemical and Computational Studies in the [(η5-C5H5)Fe(CO)2]2 System. Organometallics 2008. [DOI: 10.1021/om800366h] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Greg A. N. Felton
- Department of Chemistry, The University of Arizona, Tucson, Arizona 85721
| | - Aaron K. Vannucci
- Department of Chemistry, The University of Arizona, Tucson, Arizona 85721
| | - Noriko Okumura
- Department of Chemistry, The University of Arizona, Tucson, Arizona 85721
| | - L. Tori Lockett
- Department of Chemistry, The University of Arizona, Tucson, Arizona 85721
| | - Dennis H. Evans
- Department of Chemistry, The University of Arizona, Tucson, Arizona 85721
| | - Richard S. Glass
- Department of Chemistry, The University of Arizona, Tucson, Arizona 85721
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Scapens D, Adams H, Johnson TR, Mann BE, Sawle P, Aqil R, Perrior T, Motterlini R. [(η-C5H4R)Fe(CO)2X], X = Cl, Br, I, NO3, CO2Me and [(η-C5H4R)Fe(CO)3]+, R = (CH2)nCO2Me (n = 0–2), and CO2CH2CH2OH: a new group of CO-releasing molecules. Dalton Trans 2007:4962-73. [DOI: 10.1039/b704832g] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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48
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Wang H, Xie Y, King RB, Schaefer HF. Unsaturation in Binuclear Cyclopentadienyliron Carbonyls. Inorg Chem 2006; 45:3384-92. [PMID: 16602798 DOI: 10.1021/ic051613l] [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
The binuclear cyclopentadienyliron carbonyls Cp2Fe2(CO)n (n = 4, 3, 2, 1; Cp = eta(5)-C5H5) have been studied by density functional theory (DFT) using the B3LYP and BP86 methods. The trans- and cis-Cp2Fe2(CO)2(mu-CO)2 isomers of Cp2Fe2(CO)4 known experimentally are predicted by DFT methods to be genuine minima with no significant imaginary vibrational frequencies. The energies of these two Cp2Fe2(CO)2(mu-CO)2 structures are very similar, consistent with the experimental observation of an equilibrium between these isomers in solution. An intermediate between the interconversion of the trans- and cis-Cp2Fe2(CO)2(mu-CO)2 dibridged isomers of Cp2Fe2(CO)4 can be the trans unbridged isomer of Cp2Fe2(CO)4 calculated to be 2.3 kcal/mol (B3LYP) or 9.1 kcal/mol (BP86) above the global minimum trans-Cp2Fe2(CO)2(mu-CO)2. For the unsaturated Cp2Fe2(CO)3, the known triplet isomer Cp2Fe2(mu-CO)3 with an Fe=Fe double bond similar to the O=O double bond in O2 is found to be the global minimum. The lowest-energy structure for the even more unsaturated Cp2Fe2(CO)2 is a dibridged structure Cp2Fe2(mu-CO)2, with a short Fe-Fe distance suggestive of the Fe[triple bond]Fe triple bond required to give both Fe atoms the favored 18-electron configuration. Singlet and triplet unbridged structures for Cp2Fe2(CO)2 were also found but at energies considerably higher (20-50 kcal/mol) than that of the global minimum Cp2Fe2(mu-CO)2. The lowest-energy structure for Cp2Fe2(CO) is the triplet unsymmetrically bridged structure Cp2Fe2(mu-CO), with a short Fe-Fe distance (approximately 2.1 A) suggestive of the sigma + 2pi + (2/2)delta Fe[quadruple bond]Fe quadruple bond required to give both Fe atoms the favored 18-electron rare gas configuration.
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Affiliation(s)
- Hongyan Wang
- Atomic and Molecular Physics Institute, Sichuan University, Chengdu 610065, People's Republic of China
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Fehlhammer WP, Schröder A, Sperber W, Fuchs J. Isocyanid‐ und Heteroallen‐verbrückte Metallkomplexe, VIII. Dieisenkomplexe mit Acylisocyanid‐ und Iminoacylisocyanid‐Brückenliganden. ACTA ACUST UNITED AC 2006. [DOI: 10.1002/cber.19921250517] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Wolf Peter Fehlhammer
- Institut für Anorganische und Analytische Chemie der Freien Universität Berlin, Fabeckstraße 34–36, W‐1000 Berlin 33
| | - Andreas Schröder
- Institut für Anorganische und Analytische Chemie der Freien Universität Berlin, Fabeckstraße 34–36, W‐1000 Berlin 33
| | - Wilfried Sperber
- Institut für Anorganische und Analytische Chemie der Freien Universität Berlin, Fabeckstraße 34–36, W‐1000 Berlin 33
| | - Joachim Fuchs
- Institut für Anorganische und Analytische Chemie der Freien Universität Berlin, Fabeckstraße 34–36, W‐1000 Berlin 33
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Sänger I, Heilmann JB, Bolte M, Lerner HW, Wagner M. The pentanuclear Feiicluster [(C5H4)6Fe5]2−: bringing together ferrocene sandwiches and homoleptic Feii-cyclopentadienyl σ-complexes. Chem Commun (Camb) 2006:2027-9. [PMID: 16767264 DOI: 10.1039/b602359b] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Reaction of [(fc)3(Li)6.(TMEDA)2] with FeCl2 gives the pentanuclear iron complex [(fc)3(Fe)2(Li)2.(TMEDA)2] featuring two ferra[1]ferrocenophane moieties bridged by a 1,1'-ferrocenediyl unit; the non-ferrocene Fe(II) ions are tetra-coordinate and adopt a high-spin state.
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Affiliation(s)
- Ingeborg Sänger
- Institut für Anorganische Chemie, J. W. Goethe-Universität Frankfurt, Marie-Curie-Strasse 11, D-60439 Frankfurt (Main), Germany
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