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Gao P, Cai XP, Xie Q, Yang Q, Ou H, Wu WQ, Xu X, Xu Z, Lin X. Theoretical Studies on the Structures of Metal String Complexes Cr n(L) 4Cl 2 ( n = 3, 5, 7; L = Oligo-α-Pyridylamide) under the Effect of an Electric Field. Inorg Chem 2021; 60:9378-9386. [PMID: 34137268 DOI: 10.1021/acs.inorgchem.1c00206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
To study the electronic structures and properties of [Crn(L)4Cl2] (n = 3, L = dpa: di(2-pyridyl)amido; n = 5, L = tpda: tripyridyldiamido; n = 7, L = teptra: tetrapyridyltriamine) metal string complexes, the BP86 method was used by considering the influence of the electric field (EF) applied parallel to the metal axis. As the EF increases, the migration of more positively charged Crodd is more significant than that of Creven, which results in alternating long-short Cr-Cr bonds. This happens because of the natural charges on the Crodd of 1-3, which are more electropositive than those on Creven. The electrons are pulled to the Cr and Cl(r) atoms at the high-potential side from Cl(l) at the low-potential side by the EF, which leads to asymmetrical FMOs. After the critical electric field (Ec), the configuration turns into a remarkably asymmetric one with alternating Cr-Cr quadruple bonds and weak interactions. The electrons are transferred from equatorial ligands (L) to metal chains. In the meantime, the asymmetry of the FMOs increases and the delocalization is further reduced, which affects the conductivity. Especially for [Cr7(teptra)4Cl2], the delocalized electrons of HOMO are completely transformed into a localized model after the critical electric field. It is observed that this supports the electric switching phenomenon ascribed to the conformations of delocalized and localized electrons. In addition, the longer the length of the metal chain, the smaller the Ec and the easier is for the complexes to be polarized by the EF.
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Affiliation(s)
- Pan Gao
- Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, School of Chemistry, South China Normal University, Guangzhou 510006, P. R. China
| | - Xue-Ping Cai
- Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, School of Chemistry, South China Normal University, Guangzhou 510006, P. R. China
| | - Qiongyi Xie
- Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, School of Chemistry, South China Normal University, Guangzhou 510006, P. R. China
| | - Qingyun Yang
- Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, School of Chemistry, South China Normal University, Guangzhou 510006, P. R. China
| | - Hong Ou
- Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, School of Chemistry, South China Normal University, Guangzhou 510006, P. R. China
| | - Wei-Qing Wu
- Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, School of Chemistry, South China Normal University, Guangzhou 510006, P. R. China
| | - Xuan Xu
- Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, School of Chemistry, South China Normal University, Guangzhou 510006, P. R. China
| | - Zhiguang Xu
- Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, School of Chemistry, South China Normal University, Guangzhou 510006, P. R. China
| | - Xiaoming Lin
- Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, School of Chemistry, South China Normal University, Guangzhou 510006, P. R. China
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Ou JH, Jin BY. Band Structures of Quasi-One-Dimensional Incommensurate Helical Systems: A Case Study of Infinite Chromium Extended Metal Atom Chain. J Phys Chem A 2018; 122:9199-9208. [PMID: 30444123 DOI: 10.1021/acs.jpca.8b07144] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Extended metal atom chains (EMACs) are promising candidates for molecular wires but their band structures remain to be explored. As a quasi-one-dimensional (Q1D) system, the incommensurate helical nature of EMACs hinders such calculations. In this work, we resolved this issue via explicit implementation of helical symmetry. Moreover, the pattern of metal d bands was rationalized by a systematic investigation on a series of related Q1D helical systems. Two critical factors, helical ligand field and chemically asymmetric ligand field, are proposed and identified. We found that the symmetry and ligand fields of the system dominate the pattern of the metal d bands, instead of specific chemical composition of ligands. The presented method and rationale are applicable to not only EMACs but also related Q1D helical systems.
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Affiliation(s)
- Jen-Hao Ou
- Department of Chemistry , National Taiwan University , Taipei 10617 , Taiwan
| | - Bih-Yaw Jin
- Department of Chemistry , National Taiwan University , Taipei 10617 , Taiwan
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Linear pentanuclear nickel(II) and tetranuclear copper(II) complexes with pyrazine-modulated tripyridyldiamine ligand: Synthesis, structure and properties. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2018.08.045] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Cheng CH, Wang WZ, Peng SM, Chen IC. Excited state dynamics of symmetric and asymmetric Cr 3(dpa) 4Cl 2 measured using femtosecond transient absorption spectroscopy. Phys Chem Chem Phys 2018; 19:25471-25477. [PMID: 28900646 DOI: 10.1039/c7cp03968a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein, the excited-state dynamics of an extended metal atom chain complex, Cr3(dpa)4Cl2 (dpa = dipyridylamide), in tetrahydrofuran solution were investigated using femtosecond transient absorption spectroscopy. Upon excitation at a wavelength of 330 nm, two distinct excited-state absorption species with varied dynamics were identified and assigned to the symmetric (s-) and unsymmetric (u-) Cr3(dpa)4Cl2. The major species is s-Cr3(dpa)4Cl2 that undergoes rapid conversion at less than 100 fs from the ligand-centred π-π* state, which is the initially accessed state, to the metal-centred d-d state and then vibrational cooling accompanying the structural relaxation at a time constant ∼2.2 ps. Most of the s-form is recovered to the ground state at ∼200 ps. For u-Cr3(dpa)4Cl2, a similar rapid conversion to d-d states is observed, and the geometric/vibrational relaxation is ∼0.8 ps. The second recovery of the ground state with approximately equal amplitude is observed at a time constant of ∼5 ns. This might be because many d-d states exist and about half of them inefficiently couple with the ground state surface.
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Affiliation(s)
- Chao-Han Cheng
- Department of Chemistry, National Tsing Hua University, Hsinchu, Taiwan 30013, Republic of China.
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Wang WZ, Zhao D, Zhao MJ, Li H, Liu S, Ismayilov RH, Lee GH, Peng SM. Linear hexanuclear nickel complexes with rich electrochemical features and facility to reduction. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2016.11.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Ismayilov RH, Wang WZ, Lee GH, Peng SM, Suleimanov BA. Synthesis, crystal structure and properties of a pyrimidine modulated tripyridyldiamino ligand and its complexes. Polyhedron 2017. [DOI: 10.1016/j.poly.2016.11.023] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Wu LC, Thomsen MK, Madsen SR, Schmoekel M, Jørgensen MRV, Cheng MC, Peng SM, Chen YS, Overgaard J, Iversen BB. Chemical Bonding in a Linear Chromium Metal String Complex. Inorg Chem 2014; 53:12489-98. [DOI: 10.1021/ic501603x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Lai-Chin Wu
- Center
for Materials Crystallography, Department of Chemistry and iNANO, Aarhus University, Langelandsgade 140, Aarhus DK-8000, Denmark
| | - Maja K. Thomsen
- Center
for Materials Crystallography, Department of Chemistry and iNANO, Aarhus University, Langelandsgade 140, Aarhus DK-8000, Denmark
| | - Solveig R. Madsen
- Center
for Materials Crystallography, Department of Chemistry and iNANO, Aarhus University, Langelandsgade 140, Aarhus DK-8000, Denmark
| | - Mette Schmoekel
- Center
for Materials Crystallography, Department of Chemistry and iNANO, Aarhus University, Langelandsgade 140, Aarhus DK-8000, Denmark
| | - Mads R. V. Jørgensen
- Center
for Materials Crystallography, Department of Chemistry and iNANO, Aarhus University, Langelandsgade 140, Aarhus DK-8000, Denmark
| | | | - Shie-Ming Peng
- Department
of Chemistry, Academia Sinica, Taipei, Taiwan
| | - Yu-Sheng Chen
- ChemMatCARS Beamline, Advanced Photon Source, The University of Chicago, Argonne, Illinois 60439, United States
| | - Jacob Overgaard
- Center
for Materials Crystallography, Department of Chemistry and iNANO, Aarhus University, Langelandsgade 140, Aarhus DK-8000, Denmark
| | - Bo B. Iversen
- Center
for Materials Crystallography, Department of Chemistry and iNANO, Aarhus University, Langelandsgade 140, Aarhus DK-8000, Denmark
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Hua SA, Tsai YC, Peng SM. A Journey of Metal-metal Bonding beyond Cotton's Quadruple Bonds. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.201300417] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Po-Chun Liu I, Chen CH, Peng SM. The Road to Molecular Metal Wires: The Past and Recent Advances of Metal String Complexes. ACTA ACUST UNITED AC 2012. [DOI: 10.4019/bjscc.59.3] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Affiliation(s)
- Isiah Po-Chun Liu
- Department of Chemistry and Center for Emerging Material and Advanced Devices, National Taiwan University
| | - Chun-hsien Chen
- Department of Chemistry and Center for Emerging Material and Advanced Devices, National Taiwan University
| | - Shie-Ming Peng
- Department of Chemistry and Center for Emerging Material and Advanced Devices, National Taiwan University
- Institute of Chemistry, Academia Sinica
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Zhang J, Zhu LG. Synthesis, structures, and properties of three coordination compounds based on trinickel clusters extended by phenyldicarboxylate ligands. CrystEngComm 2011. [DOI: 10.1039/c0ce00166j] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Pardo E, Ferrando-Soria J, Dul MC, Lescouëzec R, Journaux Y, Ruiz-García R, Cano J, Julve M, Lloret F, Cañadillas-Delgado L, Pasán J, Ruiz-Pérez C. Oligo-m-phenyleneoxalamide Copper(II) Mesocates as Electro-Switchable Ferromagnetic Metal-Organic Wires. Chemistry 2010; 16:12838-51. [DOI: 10.1002/chem.201001737] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Mashima K. Linearly Aligned Metal Clusters: Versatile Reactivity and Bonding Nature of Tetrametal M–Mo–Mo–M Complexes (M = Pt, Pd, Ir, and Rh) Supported by 6-Diphenylphosphino-2-pyridonato Ligand. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2010. [DOI: 10.1246/bcsj.20090281] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Cheng CH, Hung RD, Wang WZ, Peng SM, Chen IC. Excited-State Dynamics of Metal String Complex Ni3(dpa)4X2from Femtosecond Transient Absorption Spectra. Chemphyschem 2010; 11:517-24. [DOI: 10.1002/cphc.200900737] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Tabookht Z, López X, de Graaf C. Analysis of the Magnetic Coupling in M3(dpa)4Cl2 Systems (M = Ni, Pd, Cu, Ag) by Ab Initio Calculations. J Phys Chem A 2010; 114:2028-37. [DOI: 10.1021/jp910763d] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Zahra Tabookht
- Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, C/Marcel·lí Domingo s/n, 43007, Tarragona, Spain, and Institució Catalana de Recerca i Estudi Avançats (ICREA), Passeig Lluís Companys 23, 08010 barcelona, Spain
| | - Xavier López
- Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, C/Marcel·lí Domingo s/n, 43007, Tarragona, Spain, and Institució Catalana de Recerca i Estudi Avançats (ICREA), Passeig Lluís Companys 23, 08010 barcelona, Spain
| | - Coen de Graaf
- Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, C/Marcel·lí Domingo s/n, 43007, Tarragona, Spain, and Institució Catalana de Recerca i Estudi Avançats (ICREA), Passeig Lluís Companys 23, 08010 barcelona, Spain
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Metal–Metal Bonds in Chains of Three or More Metal Atoms: From Homometallic to Heterometallic Chains. STRUCTURE AND BONDING 2010. [DOI: 10.1007/978-3-642-05243-9_1] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Yin CX, Su J, Huo FJ, Ismayilov RH, Wang WZ, Lee GH, Yeh CY, Peng SM. Synthesis, structure, magnetism, and electrochemical properties of a linear pentanuclear Ni5 compound derived from an oligo-α-pyridylamino ligand: Ni5(μ-dmpdda)4(NCS)2. J COORD CHEM 2009. [DOI: 10.1080/00958970902988837] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Cai-Xia Yin
- a Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of Education , Institute of Molecular Science, Shanxi University , Taiyuan 030006, PR China
- c Department of Chemistry , National Taiwan University , Taipei, Taiwan, ROC
| | - Jing Su
- a Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of Education , Institute of Molecular Science, Shanxi University , Taiyuan 030006, PR China
| | - Fang-Jun Huo
- b Research Institute of Applied Chemistry, Shanxi University , Taiyuan, 030006, PR China
| | - Rayyat-H. Ismayilov
- c Department of Chemistry , National Taiwan University , Taipei, Taiwan, ROC
| | - Wen-Zhen Wang
- c Department of Chemistry , National Taiwan University , Taipei, Taiwan, ROC
| | - Gene-Hsiang Lee
- c Department of Chemistry , National Taiwan University , Taipei, Taiwan, ROC
| | - Chen-Yu Yeh
- d Department of Chemistry , National Chung Hsing University , Taichung, Taiwan, ROC
| | - Shie-Ming Peng
- c Department of Chemistry , National Taiwan University , Taipei, Taiwan, ROC
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Synthesis, Structure, Magnetism and Electrochemical Properties of Linear Pentanuclear Complex: Ni5(µ-dmpzda)4(NCS)2. CHINESE J CHEM 2009. [DOI: 10.1002/cjoc.200990216] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Liu IPC, Wang WZ, Peng SM. New generation of metal string complexes: strengthening metal-metal interaction via naphthyridyl group modulated oligo-alpha-pyridylamido ligands. Chem Commun (Camb) 2009:4323-31. [PMID: 19597588 DOI: 10.1039/b904719k] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
To design new metal string complexes, several naphthyridyl group modulated oligo-alpha-pyridylamido ligands have been synthesized in the past five years. Because these ligands are less anionic than pyridylamido ligands, the resulting metal string complexes tend to form reduced mixed-valence [Ni(2)(napy)(4)](3+) dinuclear units which contain a delocalized unpaired electron and thus significantly enhance the conductance of metal string complexes. Furthermore, the asymmetric naphthyridyl group modulated oligo-alpha-pyridylamido ligands can stabilize the central heteronuclear or charge disproportionational metal frameworks, providing a plausible strategy to build inorganic molecular rectifiers.
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Affiliation(s)
- Isiah Po-Chun Liu
- Department of Chemistry, National Taiwan University, Taipei, 106, Taiwan, ROC
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Ismayilov RH, Wang WZ, Lee GH, Chien CH, Jiang CH, Chiu CL, Yeh CY, Peng SM. Redox Modification of EMACs Through the Tuning of Ligands: Heptametal(II) Complexes of Pyrazine-Modulated Oligo-α-pyridylamido Ligands. Eur J Inorg Chem 2009. [DOI: 10.1002/ejic.200900046] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Huang GC, Liu IPC, Kuo JH, Huang YL, Yeh CY, Lee GH, Peng SM. Further investigations of linear trirhodium complexes: experimental and theoretical studies of [Rh3(dpa)4Cl2] and [Rh3(dpa)4Cl2](BF4) [dpa = bis(2-pyridyl)amido anion]. Dalton Trans 2009:2623-9. [DOI: 10.1039/b820060b] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Cotton FA, Murillo CA, Wang Q, Young MD. Unusual Magnetism of an Unsymmetrical Trinickel Chain. Eur J Inorg Chem 2008. [DOI: 10.1002/ejic.200800808] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Ismayilov RH, Wang WZ, Wang RR, Huang YL, Yeh CY, Lee GH, Peng SM. Stabilization of Long Cationic EMACs by Reduction or Loss of One Metal Ion. Eur J Inorg Chem 2008. [DOI: 10.1002/ejic.200800450] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Chan ZK, Lin CH, Wang CC, Chen JD, Wang JC, Liu CW. Syntheses, structures and magnetism of linear tri- and tetra-copper chains containing anions of N,N′-bis(pyrimidine-2-yl)formamidine. Dalton Trans 2008:2183-9. [DOI: 10.1039/b715995a] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Ikeda M, Haraguchi S, Numata M, Shinkai S. Controlled Stability of the Triple-Stranded Helical Structure of a β-1,3-Glucan with a Chromophoric Aromatic Moiety at a Peripheral Position. Chem Asian J 2007; 2:1290-8. [PMID: 17696178 DOI: 10.1002/asia.200700150] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
We synthesized a semiartificial beta-1,3-glucan, curdlan with dialkylaniline groups (CUR-DA), that bears chromophoric aromatic groups at its peripheral positions. Spectroscopic studies as well as microscopic observations indicate that CUR-DA adopts a triple-stranded helical structure in water- or methanol-rich solutions of dimethyl sulfoxide (DMSO). This triple-stranded helical structure exhibits high thermal stability and resistance to base, attributes that are similar to those of the triple-stranded helical structure of native beta-1,3-glucans such as schizophyllan. Moreover, we found that the stability of the triple-stranded helical structure can be easily modulated by solvent composition and metal-ion (Zn2+) binding. As beta-1,3-glucan polysaccharides are known to serve as "polymeric" hosts, including certain DNA molecules, carbon nanotubes, and conjugated polymers, and complexation occurs only with the single-stranded structure, this information is very useful for the creation of these attractive polymeric composites, the controlled release of DNA, and so on.
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Affiliation(s)
- Masato Ikeda
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, Fukuoka 819-0395, Japan
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Novel multi-spin-state linear hexanickel complexes and their singly oxidized products with 1,8-naphthyridine-based ligands: Tuning the redox properties of the metal string. Polyhedron 2007. [DOI: 10.1016/j.poly.2007.04.036] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Kuo CK, Liu IPC, Yeh CY, Chou CH, Tsao TB, Lee GH, Peng SM. Oxidation of Linear Trinuclear Ruthenium Complexes [Ru3(dpa)4Cl2] and [Ru3(dpa)4(CN)2]: Synthesis, Structures, Electrochemical and Magnetic Properties. Chemistry 2007; 13:1442-51. [PMID: 17133641 DOI: 10.1002/chem.200601219] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The neutral, monocationic, and dicationic linear trinuclear ruthenium compounds [Ru(3)(dpa)(4)(CN)(2)], [Ru(3)(dpa)(4)(CN)(2)][BF(4)], [Ru(3)(dpa)(4)Cl(2)][BF(4)], and [Ru(3)(dpa)(4)Cl(2)][BF(4)](2) (dpa=the anion of dipyridylamine) have been synthesized and characterized by various spectroscopic techniques. Cyclic voltammetric and spectroelectrochemical studies on the neutral and oxidized compounds are reported. These compounds undergo three successive metal-centered one-electron-transfer processes. X-ray structural studies reveal a symmetrical Ru(3) unit for these compounds. While the metal--metal bond lengths change only slightly, the metal--axial ligand lengths exhibit a significant decrease upon oxidation of the neutral complex. The electronic configuration of the Ru(3) unit changes as the axial chloride ligands are replaced by the stronger "pi-acid" cyanide axial ligands. Magnetic measurements and (1)H NMR spectra indicate that [Ru(3)(dpa)(4)Cl(2)] and [Ru(3)(dpa)(4)Cl(2)][BF(4)](2) are in a spin state of S=0 and [Ru(3)(dpa)(4)Cl(2)][BF(4)], [Ru(3)(dpa)(4)(CN)(2)], and [Ru(3)(dpa)(4)(CN)(2)][BF(4)] are in spin states of S=1/2, 1, and 3/2, respectively. These results are consistent with molecular orbital (MO) calculations.
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Affiliation(s)
- Ching-Kuo Kuo
- Department of Chemistry, National Taiwan University, No 1, Roosevelt Rd., Sec. 4, Taipei, Taiwan
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Ismayilov RH, Wang WZ, Wang RR, Yeh CY, Lee GH, Peng SM. Four quadruple metal–metal bonds lined up: linear nonachromium(ii) metal string complexes. Chem Commun (Camb) 2007:1121-3. [PMID: 17347712 DOI: 10.1039/b614597c] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Through a new pyrazine-modulated penta-pyridyl-tetraamine ligand, H(4)N(9)-mpz, linear nonachromium(II) complexes with four quadruple metal-metal bonds were successfully obtained, and their structure, magnetic and electrochemistry properties were studied.
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Affiliation(s)
- Rayyat H Ismayilov
- Department of Chemistry, National Taiwan University, Taipei, Taiwan, ROC
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Wang WZ, Ismayilov RH, Lee GH, Liu IPC, Yeh CY, Peng SM. The nano-scale molecule with the longest delocalized metal–metal bonds: linear heptacobalt(ii) metal string complexes [Co7(µ7-L)4X2]. Dalton Trans 2007:830-9. [PMID: 17297510 DOI: 10.1039/b614661a] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new type of pyrazine-modulated oligo-alpha-pyridylamino ligands, N2-(pyrazin-2-yl)-N6-(6-(pyrazin-2-ylamino)pyridin-2-yl)pyridine-2,6-diamine (H3pzpz) and N2-(pyrazin-2-yl)-N6-(6-(pyridin-2-ylamino)pyridin-2-yl)pyridine-2,6-diamine (H3tpz), were synthesized and characterized by IR, 1H NMR and MS(FAB). Using and , the linear heptacobalt(II) metal string complexes [Co7(micro7-L)4X2] (L=pzpz3-, X=Cl-, NCS-; L=tpz3-, X=Cl-, X=NCS-) were synthesized and structurally characterized. The structures showed the shortest Co-Co distance (2.194 A) and the longest Co chain (13.5 A) obtained to date with direct Co-Co bonds. The Co-Co distances are in the range 2.194-2.309 A. Electrochemical studies showed two reversible oxidations and one reversible reduction, while all the redox reactions of H3pzpz complexes, and , occurred at higher potentials than H3tpz complexes, and . The complexes are fairly stable to oxidation. Temperature-dependent magnetic research on revealed anomalous magnetic behavior with intermediate magnetic moment values between quartet and doublet states, and deviation from the Curie-Weiss law.
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Affiliation(s)
- Wen-Zhen Wang
- Department of Chemistry, National Taiwan University, Taipei, Taiwan, ROC
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Ismayilov RH, Wang WZ, Lee GH, Wang RR, Liu IPC, Yeh CY, Peng SM. New versatile ligand family, pyrazine-modulated oligo-α-pyridylamino ligands, from coordination polymer to extended metal atom chains. Dalton Trans 2007:2898-907. [PMID: 17607404 DOI: 10.1039/b700533d] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Here we designed and synthesized a new ligand, di(2-pyrazyl)amine (Hdpza) (1) and studied its coordination modes and the corresponding complexes with Cu(II), Co(II), Ni(II) and Cr(II). Hdpza is an analogue of the well-studied di(2-pyridyl)amine (Hdpa) ligand, which was used to generate the first extended metal atom chain. Three types of coordination modes were found: anti-anti style which resulted in a mononuclear compound [Cu(Hdpza)(2)(H(2)O)(2)](ClO(4))(2) (2); anti-syn which was observed in a complex for the first time and resulted in a 2-D coordination polymer [Co(mu(2)-Hdpza)(2)(NCS)(2)] (3); and syn-syn type which was observed in extended metal atom chains [Ni(3)(mu(3)-dpza)(4)Cl(2)] (4), [Ni(3)(mu(3)-dpza)(4)(NCS)(2)] (5) and [Cr(3)(mu(3)-dpza)(4)Cl(2)] (6). Weak antiferromagnetic coupling via Hdpza was observed in 3, whereas magnetic studies on extended metal atom chains 4 and 5 revealed that the interaction parameter was more than -200 cm(-1). Electrochemistry showed that the extended metal atom chains 4-6 are much more stable to oxidation than the Hdpa complexes, and are able to undergo reduction.
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López X, Bénard M, Rohmer MM. Linear trimetallic complexes with 24 d electrons: Magnetic interactions in [Ni3]6+ and [Ni–Pd–Ni]6+ dipyridylamide chain complexes from density functional theory. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/j.theochem.2006.08.040] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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34
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Xu J, Raymond KN. Structurally Characterized Quadruple-Stranded Bisbidentate Helicates. Angew Chem Int Ed Engl 2006; 45:6480-5. [PMID: 16952184 DOI: 10.1002/anie.200602060] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Jide Xu
- Department of Chemistry, University of California, Berkeley, CA 94720-1460, USA
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35
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Xu J, Raymond KN. Structurally Characterized Quadruple-Stranded Bisbidentate Helicates. Angew Chem Int Ed Engl 2006. [DOI: 10.1002/ange.200602060] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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36
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López X, Huang MY, Huang GC, Peng SM, Li FY, Bénard M, Rohmer MM. Even-Numbered Metal Chain Complexes: Synthesis, Characterization, and DFT Analysis of [Ni4(μ4-Tsdpda)4(H2O)2] (Tsdpda2- = N-(p-toluenesulfonyl)dipyridyldiamido), [Ni4(μ4-Tsdpda)4]+, and Related Ni4 String Complexes. Inorg Chem 2006; 45:9075-84. [PMID: 17054368 DOI: 10.1021/ic0612505] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The synthesis and the X-ray structure of two complexes exhibiting a linear chain of four nickel atoms is reported, following Ni4(mu4-phdpda)4 (1), which had been characterized previously. [Ni4(mu4-Tsdpda)4(H2O)2], where H2Tsdpda is N-(p-toluenesulfonyl)dipyridyldiamine (2), is axially coordinated to two water molecules, at variance with 1. One-electron oxidation of 2 resulted in the loss of the axial ligands, yielding [Ni4(mu4-Tsdpda)4]+, [3]+, which was also structurally characterized. Finally, we report the structure of Ni4(mu4-DAniDANy)4 (4), a complex synthesized starting from the new ligand N,N'-bis-p-anisyl-2,7-diamino-1,8-naphthyridine. Magnetic measurements concluded that 4 is diamagnetic, like 1, whereas 2 is antiferromagnetic (-2J(14) = 80 cm(-)(1), using the Heisenberg Hamiltonian H = -2J(14) S(1).S(4)), as are other axially coordinated chains with an odd number of nickel atoms. DFT calculations are reported on these complexes in order to rationalize their electronic structure and their magnetic behavior. The magnetic properties of the [Ni4]8+ complexes are governed by the electronic state of the Ni(II) atoms, which may be either low-spin (S = 0), or high-spin (S = 1). DFT calculations show that the promotion to high spin of two Ni atoms in the chain, either external or internal, depends on the interplay between axial and equatorial coordination. The synergy between axial coordination and the presence of electron-withdrawing toluenesulfonyl substituents in 2 favors the promotion to the high-spin state of the terminal Ni atoms, thus yielding an antiferromagnetic ground state for the complex. This is at variance with complexes 1 and 4, for which the lowest quintet state results from the promotion to high spin of the internal nickel atoms, together with an important ligand participation, and is destabilized by 9 to 16 kcal mol(-1) with respect to the diamagnetic ground state.
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Affiliation(s)
- Xavier López
- Laboratoire de Chimie Quantique, Institut de Chimie, LC3-UMR 7177, CNRS-ULP, Strasbourg, France.
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37
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Aromí G, Gamez P, Boldron C, Kooijman H, Spek AL, Reedijk J. A Zig-Zag [MnII4] Cluster from a Novel Bis(β-diketonate) Ligand. Eur J Inorg Chem 2006. [DOI: 10.1002/ejic.200600105] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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38
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Chien CH, Chang JC, Yeh CY, Lee GH, Fang JM, Song Y, Peng SM. Weak antiferromagnetic coupling for novel linear hexanuclear nickel(II) string complexes (Ni6 12+) and partial metal-metal bonds in their one-electron reduction products (Ni6 11+). Dalton Trans 2006:3249-56. [PMID: 16802043 DOI: 10.1039/b516749c] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The preparation, crystal structures, magnetic properties and electrochemistry of novel linear hexanuclear nickel string complexes (Ni6(12+)) and their corresponding 1-e(-) reduction products (Ni6(11+)) are reported. In these complexes, the hexanickel chain is in a symmetrical arrangement (approximately D(4) symmetry) and is helically supported by four bpyany(2-) ligands [bpyany(2-) = the dianion of 2,7-bis(alpha-pyridylamino)-1,8-naphthyridine]. The Ni6(12+) complexes show that the two terminal nickel ions have high-spin states (S = 1) and the four inner ones have low-spin states (S = 0). The two terminal nickel ions exhibit weak antiferromagnetic coupling of ca.-5 cm(-1). All of Ni6(12+) complexes display three reversible redox couples at about -0.70, -0.20 and +1.10 V (vs. Ag/AgCl). The first reduction wave at about -0.20 V suggests facility of 1-e(-) reduction for the Ni(6)(12+) compounds. The reaction of Ni(6)(12+) complexes with hydrazine afforded the 1-e(-) reduction products (Ni6(11+)). As far as we are aware, the shortest bond distance of 2.202 A with a partial metal-metal bond was observed in Ni6(11+) compounds. The magnetic results of these Ni6(11+) compounds are in agreement with a localized model, in which the two terminal nickel ions are in a spin state of S = 1 whereas the central Ni3-Ni4 pair in a spin state of S = 1/2. The N6(11+) compounds show relatively strong antiferromagnetic coupling of about 60 cm(-1) between the terminal and the central dinickel ions.
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Affiliation(s)
- Chih-Hsien Chien
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
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39
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Chien CH, Chang JC, Yeh CY, Lee GH, Fang JM, Peng SM. Novel linear hexanuclear cobalt string complexes (Co6(12+)) and one-electron reduction products (Co6(11+)) supported by four bpyany2- ligands. Dalton Trans 2006:2106-13. [PMID: 16625255 DOI: 10.1039/b515311e] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The new ligand, 2,7-bis(alpha-pyridylamino)-1,8-naphthyridine (H2bpyany), was synthesized by the reaction of 2,7-dichloro-1,8-naphthyridine with 2-aminopyridine in the presence of t-BuOK under palladium(0)-catalyzed conditions. The preparation and characterization of novel hexacobalt string complexes, [Co6(mu6-bpyany)4(NCS)2](PF6)n (n=1 (1); n=2 (2)) and [Co6(mu6-bpyany)4(OTf)2](OTf)n (n = 2 (3); n = 1 (4)) are presented. The crystal structures for compounds have been determined by X-ray crystallography. Compounds 1 and 4 have the Co6 11+ configurations and are air-stable. Compounds 2 and 3 with Co6 12+ configurations are structurally similar to 1 and 4, respectively. The electrochemistry of 1 displays four redox couples at E1/2= -0.55, +0.38, +0.91, and +1.18 V (vs. Ag/AgCl). The magnetic data show that compounds 1 and 4 are in a spin state of S = 1/2, and 2 and 3 in a spin state of S = 1. The results of the EHMO calculations on compounds 1 and 2 are in agreement with their magnetic measurements.
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Affiliation(s)
- Chih-Hsien Chien
- Department of Chemistry, National Taiwan University, Taipei, 106, Taiwan
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40
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Hirva P, Haukka M, Jakonen M, Pakkanen TA. Growth of the metal framework in linear ruthenium and osmium carbonyls. Inorganica Chim Acta 2006. [DOI: 10.1016/j.ica.2005.06.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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41
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Huang MY, Yeh CY, Lee GH, Peng SM. Control of magnetic spin states by various mixed anionic ligands in trinickel complexes: synthesis, crystal structures and physical properties. Dalton Trans 2006:5683-90. [PMID: 17146533 DOI: 10.1039/b612123c] [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
This study provides an opportunity to control the magnetic spin of nickel atoms using various mixed anionic ligands. A series of linear trinickel complexes supported by two kinds of ligands, oligo-alpha-pyridylamido and sulfonyl amido/amido, were synthesized and their structures were determined by X-ray diffraction. The three nickel atoms of [Ni(3)(Lpts)(2)(dpa)(2)] (dpa(-) = dipyridylamido, Lpts(2-) = N,N'-bis(p-toluenesulfonyl)pyridyldiamido) display short Ni-N ( approximately 1.90 Angstrom) bond distances, which are consistent with a low spin state of Ni(II) ions, and exhibit spin states of (0, 0, 0) for the three Ni(II) ions. One of the terminal Ni(II) ions of [Ni(3)(Lms)(2)(dpa)(2)(H(2)O)] (Lms(2-) = N,N'-bis(4-methylsulfonyl)-pyridyldiamido) and [Ni(3)(Lpts)(2)(pepteaH(2))] (pepteaH(2)(2-) = pentapyridyldiamidodiamine) bonded with an axial ligand exhibits a square pyramidal (NiN(4)X) geometry with long Ni-N bond distances ( approximately 2.10 Angstrom) which are consistent with a high spin Ni(II) configuration. The spin states of these trinickel complexes are (1, 0, 0). Complexes interchanged by the removal or addition of an axial water molecule. The structural features of are comparable with those of . Both the terminal Ni(II) ions in [Ni(3)(LAc)(2)(dpa)(2)] (Lac(2-) = N,N'-biacetyl-pyridyldiamido) are in square pyramidal geometry and exhibit high spin. The spin states of the nickel ions in are (1, 0, 1), and the two terminal nickel ions exhibit antiferromagnetic interactions. The molecular structure of [Ni(3)(Lpts)(2)(dpa)(2)](BF(4)), which was obtained by the one-electron oxidation is similar to those of the neutral analogue , except for the presence of a counter anion to compensate for the positive charge on the Ni(3) core. All of the Ni-Ni bond lengths of are slightly shorter (ca. 0.05 Angstrom) than those in the neutral analogues. This is attributed to the formation of partial Ni-Ni bonding.
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Affiliation(s)
- Ming-Yi Huang
- Department of Chemistry, National Taiwan University, Taipei, Taiwan
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42
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Cotton FA, Chao H, Murillo CA, Wang Q. A trimetal chain cocooned by two heptadentate polypyridylamide ligands. Dalton Trans 2006:5416-22. [PMID: 17102867 DOI: 10.1039/b612076h] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Compounds of nickel in which a chain of three metal atoms is closely embraced by two interlocking heptadentate dianions derived from a chain of five pyridyl groups linked at the 2, or 2 and 6, positions by four amide nitrogen atoms are reported. This new type of extended metal atom chain (EMAC) compound differs from earlier ones in that ligand exchange at the axial positions cannot occur, because the axial ligands are part of the entire ligand. Four such compounds, all crystallographically characterized, are reported. This work is a proof-of-concept project that will be extended to other metals with these and other homologous ligands.
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Affiliation(s)
- F Albert Cotton
- 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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43
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Bai SD, Guo JP, Liu DS. A convenient route to silyl linked bis(amidinate) ligands and synthesis of group(i) metal derivatives. Dalton Trans 2006:2244-50. [PMID: 16673039 DOI: 10.1039/b516283a] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel type of linked bis(amidinate) ligands (D) were developed successfully. Their lithium derivatives 1-4 were synthesized by treating the silyl-bridged diamines I-IV with two equivalents of LiBu(n) and PhCN in sequence, which underwent a silyl-bridge migration process. In addition, the linked bis(amidinate) configuration proved to be the thermodynamically stable form rather than the mono(amidinate) type by contrasting reaction of I with one equivalent of LiBu(n) and PhCN in sequence.
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Affiliation(s)
- Sheng-Di Bai
- Institute of Modern Chemistry, Shanxi University, Taiyuan, Shanxi 030006, P. R. China
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44
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Chan ZK, Wu YY, Chen JD, Yeh CY, Wang CC, Tsai YF, Wang JC. Linear and cyclic tetranuclear copper(i) complexes containing anions of N,N′-bis(pyrimidine-2-yl)formamidine. Dalton Trans 2005:985-90. [PMID: 15726154 DOI: 10.1039/b417911k] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reaction of Kpmf (pmf = anion of N,N[prime or minute]-bis(pyrimidyl-2-yl)formamidine, Hpmf) with CuSCN afforded the complexes K[Cu4(pmF)3(SCN)2], 1, and Cu(4)(pmf)4, 2. Reaction of 1 with [(n-Bu)4N]PF6 in THF gave the complex [(n-Bu)4N][Cu4(pmf)3(SCN)2], 3. Their structures were characterized by X-ray crystallography. Complexes 1 and 3 are the first linear tetranuclear complexes containing only Cu(I) atoms, while complex 2 is cyclic. The four Cu(I) atoms of complexes 1 and 3 are helically bridged by three tetradentate pmf- ligands. The [Cu4(pmf)3(SCN)2]- anions of 1 show weak interactions with adjacent [K(THF)5]+ cations through the sulfur atoms, forming infinite chains which are subjected to a series of intermolecular pi-pi interactions. In complex 2, the pmf- ligands are coordinated to the copper atoms in bidentate fashion through the two central amine nitrogen atoms, leaving the pyrimidine nitrogen atoms uncoordinated. Unexpected fluxional behaviors were observed for complexes 1 and 3 in solution. By the DNMR analysis, the free energy of activation (DeltaGc(not equal)) for the exchange is 12.8 kcal mol(-1) at 278 K (T(c)), and the rate constant of exchange (K(c)) is 470 s(-1) for 1. The DeltaGc(not equal) and Kc are 12.6 kcal mol(-1) at 273 K and 433 s(-1), respectively, for 3.
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Affiliation(s)
- Zhi-Kai Chan
- Department of Chemistry, Chung-Yuan Christian University, Chung-Li, Taiwan R.O.C
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45
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46
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Berry JF, Cotton FA, Lu T, Murillo CA, Roberts BK, Wang X. Molecular and Electronic Structures by Design: Tuning Symmetrical and Unsymmetrical Linear Trichromium Chains. J Am Chem Soc 2004; 126:7082-96. [PMID: 15174879 DOI: 10.1021/ja049055h] [Citation(s) in RCA: 114] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The preparation, properties, and crystal structures of 12 trichromium extended metal atom chain (EMAC) compounds of the type Cr(3)(L)(4)X(2) (L = equatorial ligands dipyridylamide (dpa) or di-4,4'-ethyl-2,2'-pyridylamide (depa), and X = axial ligands, e.g., halide or pseudohalide ions) with large variations in metal-metal distances are reported here. These complexes, which belong to a broad class of fundamentally interesting trinuclear molecules over which the electrons may or may not be delocalized, pose significant theoretical and experimental challenges which are dealt with in this report. Complexes with strongly donating axial or equatorial ligands tend to favor a symmetrical (D(4)) molecular structure, while more weakly donating ligands give rise to unsymmetrical (C(4)) structures; the physical properties of these two classes of compounds are discussed fully, and important comparisons with a reported DFT model of the electronic structures of the compounds are made.
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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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47
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Sheng T, Appelt R, Comte V, Vahrenkamp H. Chain-Like Tetra-, Penta- and Heptanuclear Cyanide-Bridged Complexes by Attachment of Organometallic Cyanides to M2, M3 and M5 Units. Eur J Inorg Chem 2003. [DOI: 10.1002/ejic.200300276] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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48
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Kempe R. The Strained η
2
‐
N
Amido
−
N
Pyridine
Coordination of Aminopyridinato Ligands. Eur J Inorg Chem 2003. [DOI: 10.1002/ejic.200390108] [Citation(s) in RCA: 109] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Rhett Kempe
- Fachbereich Chemie, University of Oldenburg, P. O. Box 2503, 26111 Oldenburg, Germany
- Institut für Organische Katalyseforschung Rostock, Buchbinderstraße 5−6, 18055 Rostock, Germany
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49
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Berry JF, Albert Cotton F, Murillo CA. Making connections with molecular wires: extending tri-nickel chains with axial cyanide, dicyanamide, and phenylacetylide ligands. Dalton Trans 2003. [DOI: 10.1039/b305258c] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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50
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Yeh CY, Chiang YL, Lee GH, Peng SM. Unsymmetrical linear pentanuclear nickel string complexes: [Ni(5)(tpda)(4)(H(2)O)(BF(4))](BF(4))(2) and [Ni(5)(tpda)(4)(SO(3)CF(3))(2)](SO(3)CF(3)). Inorg Chem 2002; 41:4096-8. [PMID: 12160392 DOI: 10.1021/ic025582v] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The one-electron oxidized linear pentanuclear nickel complexes [Ni(5)(tpda)(4)(H(2)O)(BF(4))](BF(4))(2) (1) and [Ni(5)(tpda)(4)(SO(3)CF(3))(2)](SO(3)CF(3)) (2) have been synthesized by reacting the neutral compound [Ni(5)(tpda)(4)Cl(2)] with the corresponding silver salts. These compounds have been characterized by various spectroscopic techniques. Compound 1 crystallizes in the monoclinic space group P2(1)/n with a = 15.3022(1) A, b = 31.0705(3) A, c = 15.8109(2) A, beta = 92.2425(4) degrees, V = 7511.49(13) A(3), Z = 4, and compound 2 crystallizes in the monoclinic space group C2/c with a = 42.1894(7) A, b = 17.0770(3) A, c = 21.2117(4) A, beta = 102.5688(8) degrees, V = 14916.1(5) A(3), Z = 8. X-ray structural studies reveal an unsymmetrical Ni(5) unit for both compounds 1 and 2. Compounds 1 and 2 show stronger Ni-Ni interactions as compared to those of the neutral compounds.
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Affiliation(s)
- Chen-Yu Yeh
- Department of Chemistry, National Taiwan University, Taipei, Taiwan, and Institute of Chemistry, Academia Sinica, Taipei, Taiwan
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