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Abstract
Even though metallacyclopentadienes (MCPs) are among the most common metallacycles, their electron delocalization (aromaticity) has received far less attention than other metallacycles, such as metallabenzenes. We systematically studied the aromaticity of MCPs with energetic (isomerization stabilization energy), density (delocalization index) and magnetic (current density) aromaticity indices. The indices agree that metallacyclopentadienes are, in general, weakly aromatic at most. The 18e− complexes showed the expected weak aromaticity, and only the d8 molecules are somewhat anti-aromatic. However, the theoretical account of the aromaticity of the 16e− MCPs is more convoluted. We find that the aromatic criteria for a 16e−d4 ruthenacyclopentadiene disagree. The lack of agreement shows that significant electron delocalization is not always related to great stability or to strong diatropic currents.
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2
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Alonso-Lanza T, González JW, Aguilera-Granja F, Ayuela A. Out-of-plane magnetic anisotropy energy in the Ni 3Bz 3 molecule. Phys Chem Chem Phys 2019; 21:5305-5311. [DOI: 10.1039/c8cp04251a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ni3Bz3 molecule shows a large magnetic anisotropy energy of 8 meV, with the easy axis perpendicular to the plane of Ni metal atoms. Note that the corresponding bare Ni3 cluster has an in-plane easy axis.
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Affiliation(s)
- Tomás Alonso-Lanza
- Centro de Física de Materiales CFM-MPC CSIC-UPV/EHU
- Donostia International Physics Center (DIPC)
- Departamento de Física de Materiales
- Fac. de Químicas
- UPVEHU
| | - Jhon W. González
- Centro de Física de Materiales CFM-MPC CSIC-UPV/EHU
- Donostia International Physics Center (DIPC)
- Departamento de Física de Materiales
- Fac. de Químicas
- UPVEHU
| | - Faustino Aguilera-Granja
- Centro de Física de Materiales CFM-MPC CSIC-UPV/EHU
- Donostia International Physics Center (DIPC)
- Departamento de Física de Materiales
- Fac. de Químicas
- UPVEHU
| | - Andrés Ayuela
- Centro de Física de Materiales CFM-MPC CSIC-UPV/EHU
- Donostia International Physics Center (DIPC)
- Departamento de Física de Materiales
- Fac. de Químicas
- UPVEHU
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3
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Talavera M, Peña-Gallego A, Alonso-Gómez JL, Bolaño S. Metallaaromatic biaryl atropisomers. Chem Commun (Camb) 2018; 54:10974-10976. [PMID: 30209448 DOI: 10.1039/c8cc06443a] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Synthesis of stable irida-binaphthyl and -phenanthryl complexes, the first examples of metallaaromatic biaryl atropisomers, has been achieved. The combination of experimental and theoretical studies revealed that the nature of these systems is comparable to that of well-known 1,1'-binaphthalene both in terms of aromaticity and atropisomerism.
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Affiliation(s)
- M Talavera
- Departamento de Química Inorgánica, Universidad de Vigo, Campus Universitario, E-36310 Vigo, Spain.
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4
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Mallick S, Lu Y, Luo MH, Meng M, Tan YN, Liu CY, Zuo JL. Aromaticity-Driven Molecular Structural Variation and Electronic Configuration Alternation: An Example of Cyclic π Conjugation Involving a Mo-Mo δ Bond. Inorg Chem 2017; 56:14888-14899. [PMID: 29206033 DOI: 10.1021/acs.inorgchem.7b02133] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We have synthesized and characterized the mixed-ligand dimolybdenum paddlewheel complex Na[(DAniF)3Mo2(C3S5)] (Na[1]; DAniF = N,N'-di-p-anisylformamidinate, dmit = 1,3-dithiole-2-thione-4,5-dithiolate), which has a six-membered chelating [Mo2S2C2] ring created by equatorial coordination of the dmit (C3S5) ligand to the Mo2 unit. One-electron oxidation of Na[1] using Cp2FePF6 yields the neutral complex [(DAniF)3Mo2(C3S5)] ([1]), and removal of two electrons from Na[1] using AgBPh4 gives [(DAniF)3Mo2(C3S5)]BPh4 ([1]BPh4). In the crystal structures, [1]- and [1] present dihedral angles of 118.9 and 142.3° between the plane defined by the Mo-Mo bond vector and the dmit ligand, respectively, while DFT calculations show that in [1]+ the Mo-Mo bond and the dmit ligand are coplanar. Complex [1] is paramagnetic with a g value of 1.961 in the EPR spectrum and has a Mo-Mo bond distance of 2.133(1) Å, increased from 2.0963(9) Å for [1]-. Consistently, a broad absorption band is observed for [1] in the near-IR region, which arises from charge transfer from the dmit ligand to the cationic Mo25+ centers. Interestingly, complex [1]+ has an aromatic [Mo2S2C2] core, as evidenced by a large diamagnetic anisotropy, in addition to the coplanarity of the core structure, which shifts downfield the 1H NMR signal of the horizontal methine proton (ArN-(CH)-NAr) but upfield those of the vertical protons, relative to the methine proton resonances for the precursor ([1]-). The magnetic anisotropy (Δχ = χ⊥ - χ∥) for the [Mo2S2C2] ring in [1]+ is -105.5 ppm cgs, calculated from the McConnell equation, which is about 2-fold larger than that for benzene. The aromaticity of the [Mo2S2C2] ring is supported by theoretical studies, including single-point calculations and gauge-including atomic orbital (GIAO) NMR spectroscopic calculations at the density functional theory (DFT) level. DFT calculations also show that the [Mo2S2C2] core in [1]+ possesses a set of three highest occupied and three lowest unoccupied molecular orbitals in π character, corresponding to those of benzene in symmetry, and six π electrons that conform to the Hückel 4n + 2 rule for aromaticity. Therefore, this study shows that an aromatic [Mo2S2C2] core is formed by coupling the δ orbital of the Mo≣Mo bond with the π orbital of the C═C bond through the bridging atoms (S), thus validating the equivalency in bonding functionality between δ and π orbitals.
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Affiliation(s)
- Suman Mallick
- Department of Chemistry, Jinan University , 601 Huang-Pu Avenue West, Guangzhou-510632, China
| | - Ye Lu
- Department of Chemistry, Tongji University , Shanghai-200092, China
| | - Ming Hui Luo
- Department of Chemistry, Jinan University , 601 Huang-Pu Avenue West, Guangzhou-510632, China
| | - Miao Meng
- Department of Chemistry, Jinan University , 601 Huang-Pu Avenue West, Guangzhou-510632, China
| | - Ying Ning Tan
- Department of Chemistry, Jinan University , 601 Huang-Pu Avenue West, Guangzhou-510632, China
| | - Chun Y Liu
- Department of Chemistry, Jinan University , 601 Huang-Pu Avenue West, Guangzhou-510632, China.,Department of Chemistry, Tongji University , Shanghai-200092, China
| | - Jing-Lin Zuo
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing-210023, China
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5
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Wang P, Jiang X, Hu J, Huang X, Zhao J, Ahuja R. Prediction of huge magnetic anisotropies in 5d transition metallocenes. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:435802. [PMID: 28825594 DOI: 10.1088/1361-648x/aa8755] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The stability, electronic structure and non-collinear magnetic properties of a series of 5d metallocenes, namely, two cyclopentadienyl (Cp) rings sandwiched with a single 5d transition metal atom, are investigated. Our first-principles calculations reveal that Cp rings not only provide a suitable ligand environment for metal atoms, but also result in tunable magnetism depending on the transition metal element. Among them, HfCp2 and WCp2 show a high preference for the magnetization axis perpendicular to the Cp plane, with large magnetic anisotropy energies (MAEs) around 10 meV. We further consider triple decker metallocenes (M2Cp3), and find a huge MAE of above 60 meV in Ta2Cp3. The orbital energy split and shifts induced by composition change in metallocenes is mainly responsible for the significant MAE enhancement. By choosing a suitable crystal field for transition metal atoms, we pave a feasible pathway for designing promising building blocks of future magnetic storage devices.
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Affiliation(s)
- Peng Wang
- Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Dalian University of Technology, Ministry of Education, Dalian 116024, People's Republic of China
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6
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Li J, Li G, Xie Y, King RB, Schaefer HF. Enhanced Relative Stability of Metallabenzenes versus Metallocenes upon Ring Perfluorination: Nickel, Palladium, and Platinum Systems. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201700810] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Jing Li
- MOE Key Laboratory of Theoretical Chemistry of the Environment Center for Computational Quantum Chemistry South China Normal University 510006 Guangzhou P. R. China
| | - Guoliang Li
- MOE Key Laboratory of Theoretical Chemistry of the Environment Center for Computational Quantum Chemistry South China Normal University 510006 Guangzhou P. R. China
- Guangzhou Key Laboratory of Materials for Energy Conversion and Storage School of Chemistry and Environment South China Normal University 510006 Guangzhou P. R. China
- Department of Chemistry and Center for Computational Chemistry University of Georgia 30602 Athens Georgia USA
| | - Yaoming Xie
- Department of Chemistry and Center for Computational Chemistry University of Georgia 30602 Athens Georgia USA
| | - R. Bruce King
- MOE Key Laboratory of Theoretical Chemistry of the Environment Center for Computational Quantum Chemistry South China Normal University 510006 Guangzhou P. R. China
- Department of Chemistry and Center for Computational Chemistry University of Georgia 30602 Athens Georgia USA
| | - Henry F. Schaefer
- Department of Chemistry and Center for Computational Chemistry University of Georgia 30602 Athens Georgia USA
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7
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Núñez R, Tarrés M, Ferrer-Ugalde A, de Biani FF, Teixidor F. Electrochemistry and Photoluminescence of Icosahedral Carboranes, Boranes, Metallacarboranes, and Their Derivatives. Chem Rev 2016; 116:14307-14378. [DOI: 10.1021/acs.chemrev.6b00198] [Citation(s) in RCA: 325] [Impact Index Per Article: 40.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Rosario Núñez
- Institut de Ciència de Materials
de Barcelona (ICMAB-CSIC), Campus de la Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
| | - Màrius Tarrés
- Institut de Ciència de Materials
de Barcelona (ICMAB-CSIC), Campus de la Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
| | - Albert Ferrer-Ugalde
- Institut de Ciència de Materials
de Barcelona (ICMAB-CSIC), Campus de la Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
| | - Fabrizia Fabrizi de Biani
- Dipartimento
di Biotecnologie, Chimica e Farmacia, Universita degli Studi di Siena, via Aldo Moro, 2, 53100 Siena, Italy
| | - Francesc Teixidor
- Institut de Ciència de Materials
de Barcelona (ICMAB-CSIC), Campus de la Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
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8
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The chemistry of the carbon-transition metal double and triple bond: Annual survey covering the year 2014. Coord Chem Rev 2016. [DOI: 10.1016/j.ccr.2015.09.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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10
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Chen J, Lee KH, Sung HHY, Williams ID, Lin Z, Jia G. Synthesis and Characterization of Dirhenadehydro[12]annulenes. Angew Chem Int Ed Engl 2016; 55:7194-8. [PMID: 27125726 DOI: 10.1002/anie.201601562] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2016] [Revised: 03/20/2016] [Indexed: 01/19/2023]
Abstract
The 12-membered-ring metallacycles [mer-Re{≡CCH=C(R)C≡C-}Cl(PMe2 Ph)3 )]2 (R=CMe3 , 1-adamantyl), which are organometallic analogues of antiaromatic octadehydro[12]annulene, are prepared by heating the methyl carbyne complexes mer-Re{≡CCH=C(R)C≡CH}(CH3 )Cl(PMe2 Ph)3 . An intermolecular σ-bond metathesis between the Re-CH3 bond and the acetylenic C-H bond is proposed for their formation.
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Affiliation(s)
- Jiangxi Chen
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.,Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen, China
| | - Ka-Ho Lee
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Herman H Y Sung
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Ian D Williams
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.
| | - Zhenyang Lin
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.
| | - Guochen Jia
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.
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11
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Pansini FNN, de Souza FAL. Trends in the Spin States and Mean Static Dipole Polarizability of the Group VIIIA Metallocenes. J Phys Chem A 2016; 120:2771-8. [DOI: 10.1021/acs.jpca.6b02755] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Fernando N. N. Pansini
- Departamento de Física, Universidade Federal do Espı́rito Santo, 29075-910 Vitória, Brazil
| | - Fábio A. L. de Souza
- Departamento de Física, Universidade Federal do Espı́rito Santo, 29075-910 Vitória, Brazil
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12
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Wen TB, Lee KH, Chen J, Hung WY, Bai W, Li H, Sung HHY, Williams ID, Lin Z, Jia G. Preparation of Osmium η3-Allenylcarbene Complexes and Their Uses for the Syntheses of Osmabenzyne Complexes. Organometallics 2016. [DOI: 10.1021/acs.organomet.6b00102] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Ting Bin Wen
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
| | - Ka-Ho Lee
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
| | - Jiangxi Chen
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
| | - Wai Yiu Hung
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
| | - Wei Bai
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
| | - Huacheng Li
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
| | - Herman H. Y. Sung
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
| | - Ian D. Williams
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
| | - Zhenyang Lin
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
| | - Guochen Jia
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
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13
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Wei Y, Zhou X, Hong G, Chen Z, Zhang H, Xia H. Reactions of osmapyridinium with terminal alkynes. Org Chem Front 2015. [DOI: 10.1039/c5qo00052a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reactions of osmapyridinium with terminal alkynes are presented, which lead to the formation of ten-membered osmacycles and η4-coordinated cyclopentadiene complexes.
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Affiliation(s)
- Yuanqing Wei
- State Key Laboratory for Physical Chemistry of Solid Surfaces
- Department of Chemistry
- College of Chemistry and Chemical Engineering
- Xiamen University
- Xiamen
| | - Xiaoxi Zhou
- State Key Laboratory for Physical Chemistry of Solid Surfaces
- Department of Chemistry
- College of Chemistry and Chemical Engineering
- Xiamen University
- Xiamen
| | - Guangning Hong
- State Key Laboratory for Physical Chemistry of Solid Surfaces
- Department of Chemistry
- College of Chemistry and Chemical Engineering
- Xiamen University
- Xiamen
| | - Zhixin Chen
- State Key Laboratory for Physical Chemistry of Solid Surfaces
- Department of Chemistry
- College of Chemistry and Chemical Engineering
- Xiamen University
- Xiamen
| | - Hong Zhang
- State Key Laboratory for Physical Chemistry of Solid Surfaces
- Department of Chemistry
- College of Chemistry and Chemical Engineering
- Xiamen University
- Xiamen
| | - Haiping Xia
- State Key Laboratory for Physical Chemistry of Solid Surfaces
- Department of Chemistry
- College of Chemistry and Chemical Engineering
- Xiamen University
- Xiamen
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