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Xu Y, Luo F, Zheng JM. Syntheses, Structures, and Magnetic Properties of a Series of Heterotri-, Tetra- and Pentanuclear Ln III⁻Co II Compounds. Polymers (Basel) 2019; 11:E196. [PMID: 30960180 PMCID: PMC6418803 DOI: 10.3390/polym11020196] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2018] [Revised: 12/29/2018] [Accepted: 01/08/2019] [Indexed: 12/18/2022] Open
Abstract
Three types of Ln(III)⁻Co(II) heterometallic compounds, LnCo₂(L1)₇(bipy)₂ (Ln = Pr-1, Eu-2, Sm-3, Gd-4, Tb-5, Dy-6) (L1 = 4-chlorobenzoate, bipy = 2,2'-bipyridine), Ln₂Co₂(L₂)10(bipy)₂ (Ln = Sm-7, Gd-8, Tb-9, Dy-10, Ho-11, Er-12, Yb-13), (L2 = 2,4-dichlorobenzoate, bipy = 2,2'-bipyridine, phen = 1,10-phenanthroline), and Ln₂Co₃(L1)12(bipy)₂ (Ln = Ho-14, Er-15, Yb-16), were synthesized under hydrothermal conditions and characterized by single crystal X-ray diffraction, IR spectroscopy and magnetic measurements. Structural analyses revealed that 14⁻16 take on a unique linear pentanuclear structural motif. Interestingly, the Ho-containing compound 14 exhibits magnetic relaxation behavior.
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Affiliation(s)
- Yun Xu
- Department of Chemistry, Nankai University, Tianjin 300071, China.
- College of Chemistry and Materials Science, HuaiBei Normal University, Huaibei 235000, China.
| | - Feng Luo
- Department of Chemistry, Nankai University, Tianjin 300071, China.
| | - Ji-Min Zheng
- Department of Chemistry, Nankai University, Tianjin 300071, China.
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2
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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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3
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Theoretical study on relationship between spin structure and electron conductivity of one-dimensional tri-nickel(II) complex. Polyhedron 2017. [DOI: 10.1016/j.poly.2017.02.020] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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4
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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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5
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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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6
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Wang Z, Jagličić Z, Han LL, Zhuang GL, Luo GG, Zeng SY, Tung CH, Sun D. Octanuclear Ni(ii) cubes based on halogen-substituted pyrazolates: synthesis, structure, electrochemistry and magnetism. CrystEngComm 2016. [DOI: 10.1039/c6ce00528d] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Ting T, Hsu L, Huang M, Horng E, Lu H, Hsu C, Jiang C, Jin B, Peng S, Chen C. Energy‐Level Alignment for Single‐Molecule Conductance of Extended Metal‐Atom Chains. Angew Chem Int Ed Engl 2015; 54:15734-8. [DOI: 10.1002/anie.201508199] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2015] [Indexed: 11/06/2022]
Affiliation(s)
- Ta‐Cheng Ting
- Department of Chemistry and Center for Emerging Material and Advanced Device, National Taiwan University, 1, Sec. 4, Roosevelt Road, Taipei, 10617 (Taiwan)
| | - Liang‐Yan Hsu
- Department of Chemistry and Center for Emerging Material and Advanced Device, National Taiwan University, 1, Sec. 4, Roosevelt Road, Taipei, 10617 (Taiwan)
| | - Min‐Jie Huang
- Department of Chemistry and Center for Emerging Material and Advanced Device, National Taiwan University, 1, Sec. 4, Roosevelt Road, Taipei, 10617 (Taiwan)
| | - Er‐Chien Horng
- Department of Chemistry and Center for Emerging Material and Advanced Device, National Taiwan University, 1, Sec. 4, Roosevelt Road, Taipei, 10617 (Taiwan)
| | - Hao‐Cheng Lu
- Department of Chemistry and Center for Emerging Material and Advanced Device, National Taiwan University, 1, Sec. 4, Roosevelt Road, Taipei, 10617 (Taiwan)
| | - Chan‐Hsiang Hsu
- Department of Chemistry and Center for Emerging Material and Advanced Device, National Taiwan University, 1, Sec. 4, Roosevelt Road, Taipei, 10617 (Taiwan)
| | - Ching‐Hong Jiang
- Department of Chemistry and Center for Emerging Material and Advanced Device, National Taiwan University, 1, Sec. 4, Roosevelt Road, Taipei, 10617 (Taiwan)
| | - Bih‐Yaw Jin
- Department of Chemistry and Center for Emerging Material and Advanced Device, National Taiwan University, 1, Sec. 4, Roosevelt Road, Taipei, 10617 (Taiwan)
| | - Shie‐Ming Peng
- Department of Chemistry and Center for Emerging Material and Advanced Device, National Taiwan University, 1, Sec. 4, Roosevelt Road, Taipei, 10617 (Taiwan)
- Institute of Chemistry, Academia Sinica, Taipei, 11529 (Taiwan)
| | - Chun‐hsien Chen
- Department of Chemistry and Center for Emerging Material and Advanced Device, National Taiwan University, 1, Sec. 4, Roosevelt Road, Taipei, 10617 (Taiwan)
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8
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Ting T, Hsu L, Huang M, Horng E, Lu H, Hsu C, Jiang C, Jin B, Peng S, Chen C. Energy‐Level Alignment for Single‐Molecule Conductance of Extended Metal‐Atom Chains. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201508199] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Ta‐Cheng Ting
- Department of Chemistry and Center for Emerging Material and Advanced Device, National Taiwan University, 1, Sec. 4, Roosevelt Road, Taipei, 10617 (Taiwan)
| | - Liang‐Yan Hsu
- Department of Chemistry and Center for Emerging Material and Advanced Device, National Taiwan University, 1, Sec. 4, Roosevelt Road, Taipei, 10617 (Taiwan)
| | - Min‐Jie Huang
- Department of Chemistry and Center for Emerging Material and Advanced Device, National Taiwan University, 1, Sec. 4, Roosevelt Road, Taipei, 10617 (Taiwan)
| | - Er‐Chien Horng
- Department of Chemistry and Center for Emerging Material and Advanced Device, National Taiwan University, 1, Sec. 4, Roosevelt Road, Taipei, 10617 (Taiwan)
| | - Hao‐Cheng Lu
- Department of Chemistry and Center for Emerging Material and Advanced Device, National Taiwan University, 1, Sec. 4, Roosevelt Road, Taipei, 10617 (Taiwan)
| | - Chan‐Hsiang Hsu
- Department of Chemistry and Center for Emerging Material and Advanced Device, National Taiwan University, 1, Sec. 4, Roosevelt Road, Taipei, 10617 (Taiwan)
| | - Ching‐Hong Jiang
- Department of Chemistry and Center for Emerging Material and Advanced Device, National Taiwan University, 1, Sec. 4, Roosevelt Road, Taipei, 10617 (Taiwan)
| | - Bih‐Yaw Jin
- Department of Chemistry and Center for Emerging Material and Advanced Device, National Taiwan University, 1, Sec. 4, Roosevelt Road, Taipei, 10617 (Taiwan)
| | - Shie‐Ming Peng
- Department of Chemistry and Center for Emerging Material and Advanced Device, National Taiwan University, 1, Sec. 4, Roosevelt Road, Taipei, 10617 (Taiwan)
- Institute of Chemistry, Academia Sinica, Taipei, 11529 (Taiwan)
| | - Chun‐hsien Chen
- Department of Chemistry and Center for Emerging Material and Advanced Device, National Taiwan University, 1, Sec. 4, Roosevelt Road, Taipei, 10617 (Taiwan)
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Miyake R, Shionoya M. Concerted Ligand Exchange and the Roles of Counter Anions in the Reversible Structural Switching of Crystalline Peptide Metallo-Macrocycles. Inorg Chem 2014; 53:5717-23. [DOI: 10.1021/ic500478p] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Ryosuke Miyake
- Department
of Chemistry and Biochemistry, Graduate School of Humanities and Sciences, Ochanomizu University, 2-1-1 Otsuka, Bunkyo-ku,
Tokyo 112-8610, Japan
| | - Mitsuhiko Shionoya
- Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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Kitagawa Y, Matsui T, Nakanishi Y, Shigeta Y, Kawakami T, Okumura M, Yamaguchi K. Theoretical studies of electronic structures, magnetic properties and electron conductivities of one-dimensional Ni(n) (n = 3, 5, 7) complexes. Dalton Trans 2013; 42:16200-8. [PMID: 24091592 DOI: 10.1039/c3dt51466h] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Electronic structures, magnetic properties and electron conductivities of linearly aligned one-dimensional (1-D) Ni(II)3, Ni(II)5 and Ni(II)7 complexes, i.e. [Ni3(dpa)4NCS2], [Ni5(tpda)4X2] (X = Cl, CN, N3, NCS) and [Ni7(teptra)4Cl2], are systematically investigated by the broken-symmetry B3LYP calculations and simulations based on an elastic scattering Green's function theory. Calculated spin densities appear only at terminal Ni ions, while inner Ni ions are the closed-shell. The calculated effective exchange integrals (J(ab)) values reproduce well the experimental results that indicate anti-ferromagnetic (AF) interactions between two terminal Ni ions. Natural orbitals and their occupation numbers show that a change in the weak AF couplings by axial ligands in penta-nickel complexes originates in σ-type orbitals. Simulated electron conductivities of [Ni3(dpa)4NCS2] and [Ni5(tpda)4NCS2] semi-quantitatively correspond to the experimental results. By the analyses, it is elucidated that electrons are mainly transmitted by σ-type orbitals, but the bonds between Au and axial ligands are also dominant factors for conductivity.
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Affiliation(s)
- Yasutaka Kitagawa
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan.
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11
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A novel triruthenium metal string complex with naphthylridylamide ligand: Synthesis, structure, magnetism, and molecular conductance. INORG CHEM COMMUN 2013. [DOI: 10.1016/j.inoche.2013.10.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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12
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Bandeira NA, Tabookht Z, de Graaf C, López X. Simple versus composite nature of the magnetic coupling in copper and nickel-based metallic chains. Over- and underestimation of J. CR CHIM 2012. [DOI: 10.1016/j.crci.2011.10.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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13
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Tabookht Z, de Graaf C, López X. Towards a low-spin configuration in extended metal atom chains. Theoretical study of trimetallic systems with 22 metal electrons. Dalton Trans 2012; 41:498-504. [PMID: 22042414 DOI: 10.1039/c1dt11260k] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Different electronic configurations of a series of trinuclear heterometallic chains with 22 metallic electrons, MM'M(dpa)(4)X(2) (M = Co, Rh; M' = Ni, Pd; X = Cl, NCS), have been modelled in search of new systems with novel electrical properties. For this purpose, we explore the possibility of obtaining low-spin (extensively closed-shell) states by introducing chemical changes to the reference compound CoPdCo(dpa)(4)Cl(2) (1), isoelectronic to the herein studied systems, but possessing magnetically coupled localized electrons. The discussion is based on the orbital energies obtained by the DFT methodology. Among the systems herein analysed, CoNiCo(dpa)(4)(NCS)(2) has only two unpaired electrons vs. six in the case of 1, its closed-shell configuration appearing at high energies. For Rh(2)M-based chains, changes go a step further and the RhPdRh(dpa)(4)Cl(2) and RhPdRh(dpa)(4)(NCS)(2) molecules present a closed-shell ground state in close competition with the broken symmetry solution with S = ½ on each Rh(II). One-electron reduction of the latter compounds has been computed with marked structural changes. Our calculations show that the two lowest 23-electron states are separated by 7-8 kcal mol(-1) in favour of the state with an unpaired localized electron on the δ(Pd-N)* orbital instead of the delocalized one (σ(nb))(2)(σ*)(1).
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Affiliation(s)
- Zahra Tabookht
- Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, Marcel·lí Domingo s/n, 43007, Tarragona, Spain
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Babbini DC, Schulhauser HR, Kramer FR, Nichol GS, Hurst SK. Interactions of weakly coordinating anions with tripalladium sandwich complexes. J Organomet Chem 2011. [DOI: 10.1016/j.jorganchem.2011.06.022] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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15
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Samson D, Daltrozzo E. Synthesis of Diheteroarylamine Ligands by Palladium-Catalyzed Mono- and Diamination of Dichloroheteroarenes with Heteroarenamines. Helv Chim Acta 2011. [DOI: 10.1002/hlca.201000148] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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16
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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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17
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Papatriantafyllopoulou C, Stamatatos TC, Wernsdorfer W, Teat SJ, Tasiopoulos AJ, Escuer A, Perlepes SP. Combining azide, carboxylate, and 2-pyridyloximate ligands in transition-metal chemistry: ferromagnetic Ni(II)5 clusters with a bowtie skeleton. Inorg Chem 2010; 49:10486-96. [PMID: 20964448 DOI: 10.1021/ic1014829] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The combined use of the anion of phenyl(2-pyridyl)ketone oxime (ppko(-)) and azides (N(3)(-)) in nickel(II) carboxylate chemistry has afforded two new Ni(II)(5) clusters, [Ni(5)(O(2)CR')(2)(N(3))(4)(ppko)(4)(MeOH)(4)] [R' = H (1), Me (2)]. The structurally unprecedented {Ni(5)(μ-N(3))(2)(μ(3)-N(3))(2)}(6+) cores of the two clusters are almost identical and contain the five Ni(II) atoms in a bowtie topology. Two N(3)(-) ions are end-on doubly bridging and the other two ions end-on triply bridging. The end-on μ(3)-N(3)(-) groups link the central Ni(II) atoms with the two peripheral metal ions on either side of the molecule, while the Ni···Ni bases of the triangles are each bridged by one end-on μ-N(3)(-) group. Variable-temperature, solid-state direct- (dc) and alternating-current (ac) magnetic susceptibility, and magnetization studies at 2.0 K were carried out on both complexes. The data indicate an overall ferromagnetic behavior and an S = 5 ground state for both compounds. The ac susceptibility studies on 1 reveal nonzero, frequency-dependent out-of-phase (χ(M)") signals at temperatures below ~3.5 K; complex 2 reveals no χ(M)" signals. However, single-crystal magnetization versus dc field scans at variable temperatures and variable sweep rates down to 0.04 K on 1 reveal no noticeable hysteresis loops, except very minor ones at 0.04 K assignable to weak intermolecular interactions propagated by nonclassical hydrogen bonds.
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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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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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Leong WL, Vittal JJ. Alkali metal ion directed self-assembled Ni(ii) molecular clusters. NEW J CHEM 2010. [DOI: 10.1039/c0nj00157k] [Citation(s) in RCA: 11] [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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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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23
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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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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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Pantazis DA, Murillo CA, McGrady JE. A re-evaluation of the two-step spin crossover in the trinuclear cation [Co3(dipyridylamido)4Cl2]+. Dalton Trans 2008:608-14. [DOI: 10.1039/b715021k] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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27
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Otsuki J, Akasaka T, Araki K. Molecular switches for electron and energy transfer processes based on metal complexes. Coord Chem Rev 2008. [DOI: 10.1016/j.ccr.2007.03.005] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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28
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Liu IPC, Bénard M, Hasanov H, Chen IWP, Tseng WH, Fu MD, Rohmer MM, Chen CH, Lee GH, Peng SM. A New Generation of Metal String Complexes: Structure, Magnetism, Spectroscopy, Theoretical Analysis, and Single Molecular Conductance of an Unusual Mixed-Valence Linear [Ni5]8+ Complex. Chemistry 2007; 13:8667-77. [PMID: 17847146 DOI: 10.1002/chem.200700750] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Two new linear pentanickel complexes [Ni5(bna)4(Cl)2][PF6]2 (1) and [Ni5(bna)4(Cl)2][PF6]4 (2; bna=binaphthyridylamide), were synthesized and structurally characterized. A derivative of 1, [Ni5(bna)4(NCS)2][NCS]2 (3), was also isolated for the purpose of the conductance experiments carried out in comparison with [Ni5(tpda)4(NCS)2] (4; tpda=tripyridyldiamide). The metal framework of complex 2 is a standard [Ni5]10+ core, isoelectronic with that of [Ni5(tpda)4Cl2] (5). Also as in 5, complex 2 has an antiferromagnetic ground state (J=-15.86 cm(-1)) resulting from a coupling between the terminal nickel atoms, both in high-spin sate (S=1). Complex 1 displays the first characterized linear nickel framework in which the usual sequence of NiII atoms has been reduced by two electrons. Each dinickel unit attached to the naphthyridyl moieties is assumed to undergo a one-electron reduction, whereas the central nickel formally remains NiII. DFT calculations suggest that the metal framework of the mixed-valence complex 1 should be described as intermediate between a localized picture corresponding to NiII-NiI-NiII-NiI-NiII and a fully delocalized model represented as (Ni2)3+-NiII-(Ni2)3+. Assuming the latter model, the ground state of 1 results from an antiferromagnetic coupling (J=-34.03 cm(-1)) between the two (Ni2)3+ fragments, considered each as a single magnetic centre (S=3/2). An intervalence charge-transfer band is observed in the NIR spectrum of 1 at 1186 nm, suggesting, in accordance with DFT calculations, that 1 should be assigned to Robin-Day class II of mixed-valent complexes. Scanning tunnelling microscopy (STM) methodology was used to assess the conductance of single molecules of 3 and 4. Compound 3 was found approximately 40% more conductive than 4, a result that could be assigned to the electron mobility induced by mixed-valency in the naphthyridyl fragments.
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Affiliation(s)
- Isiah Po-Chun Liu
- Department of Chemistry, National Taiwan University, 1, Roosevelt Rd., Sec. 4, Taipei 106, Taiwan
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Liu IPC, Lee GH, Peng SM, Bénard M, Rohmer MM. Cu−Pd−Cu and Cu−Pt−Cu Linear Frameworks: Synthesis, Magnetic Properties, and Theoretical Analysis of Two Mixed-Metal Complexes of Dipyridylamide (dpa), Isostructural, and Isoelectronic with [Cu3(dpa)4Cl2]+. Inorg Chem 2007; 46:9602-8. [DOI: 10.1021/ic070319l] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Isiah Po-Chun Liu
- Laboratoire de Chimie Quantique, Institut de Chimie, UMR 7177, CNRS-ULP, Strasbourg, France, Department of Chemistry, National Taiwan University, Taipei 10764, Taiwan, Republic of China, Institute of Chemistry, Academia Sinica, Taipei, Taiwan ROC
| | - Gene-Hsiang Lee
- Laboratoire de Chimie Quantique, Institut de Chimie, UMR 7177, CNRS-ULP, Strasbourg, France, Department of Chemistry, National Taiwan University, Taipei 10764, Taiwan, Republic of China, Institute of Chemistry, Academia Sinica, Taipei, Taiwan ROC
| | - Shie-Ming Peng
- Laboratoire de Chimie Quantique, Institut de Chimie, UMR 7177, CNRS-ULP, Strasbourg, France, Department of Chemistry, National Taiwan University, Taipei 10764, Taiwan, Republic of China, Institute of Chemistry, Academia Sinica, Taipei, Taiwan ROC
| | - Marc Bénard
- Laboratoire de Chimie Quantique, Institut de Chimie, UMR 7177, CNRS-ULP, Strasbourg, France, Department of Chemistry, National Taiwan University, Taipei 10764, Taiwan, Republic of China, Institute of Chemistry, Academia Sinica, Taipei, Taiwan ROC
| | - Marie-Madeleine Rohmer
- Laboratoire de Chimie Quantique, Institut de Chimie, UMR 7177, CNRS-ULP, Strasbourg, France, Department of Chemistry, National Taiwan University, Taipei 10764, Taiwan, Republic of China, Institute of Chemistry, Academia Sinica, Taipei, Taiwan ROC
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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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31
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Zhang M, Ni J, Xie Y. Synthesis and crystal structures of two mixed-ligand Cu(II) complexes of tripyridyldiamine. J COORD CHEM 2007. [DOI: 10.1080/00958970601009851] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Min Zhang
- a Department of Chemistry , University of Science and Technology of China , Hefei, 230026, P.R. China
| | - Jia Ni
- b Center Lab , Shantou University , Shantou, P.R. China
| | - Yongshu Xie
- a Department of Chemistry , University of Science and Technology of China , Hefei, 230026, P.R. China
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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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33
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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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34
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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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35
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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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36
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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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37
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Pantazis DA, McGrady JE. A Three-State Model for the Polymorphism in Linear Tricobalt Compounds. J Am Chem Soc 2006; 128:4128-35. [PMID: 16551122 DOI: 10.1021/ja0581402] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The remarkable polymorphism exhibited by the linear tricobalt compounds, Co3(mu3-dpa)4Cl2 and Co3(mu3-dpa)4Br2, can be explained using a model involving three distinct electronic states. At high temperatures, symmetric and unsymmetric forms arise from the population of doublet (2A) and quartet (4B) states, respectively, the latter containing a localized high-spin Co(II) center. In the unsymmetric form, a reduction in temperature leads to a spin-crossover to a second quite distinct doublet state, 2B, where, uniquely, the d(x2-y2) character on the localized Co(II) center is distributed between the occupied and vacant manifolds. The variable population of the Co d(x2-y2) orbital gives rise to the continuous change in Co-Co and Co-N bond lengths as the temperature is decreased.
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Affiliation(s)
- Dimitrios A Pantazis
- WestCHEM, Department of Chemistry, University of Glasgow, Glasgow G12 8QQ, United Kingdom
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38
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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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39
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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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40
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Sevryugina Y, Olenev AV, Petrukhina MA. “Dimers of Dimers” of Ruthenium(I): Ru···BRu vs. Ru···BO Axial Interactions. J CLUST SCI 2005. [DOI: 10.1007/s10876-005-4545-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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41
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Kuo CK, Chang JC, Yeh CY, Lee GH, Wang CC, Peng SM. Synthesis, structures, magnetism and electrochemical properties of triruthenium–acetylide complexes. Dalton Trans 2005:3696-701. [PMID: 16258622 DOI: 10.1039/b506267e] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of triruthenium complexes with arylacetylide axial ligands Ru(3)(dpa)(4)(C(2)X)(2)(BF(4))(y)(dpa = dipyridylamido; X = Fc, y= 0 (1); X = Ph, y= 0 (2); X = PhOCH(3), y= 1 (3); X = PhC(5)H(11), y= 1 (4); X = PhCN, y= 0 (5); X = PhNO(2), y= 0 (6)) have been synthesized. The crystal structures show that the Ru-Ru bond lengths (2.3304(9)-2.3572(5)A) of these compounds are longer than those of Ru(3)(dpa)(4)Cl(2)(Ru-Ru=2.2537(1)A). This is ascribed to the formation of the stronger pi-backbonding from metal to axial ligand which weakens the Ru-Ru interactions and the bond order is reduced in the triruthenium unit. Cyclic voltammetry and differential pulse voltammetry show that compound exhibits electronic coupling between the two ferrocenyl units with DeltaE(1/2) close to 100 mV. Compounds 2-6 display three triruthenium-based reversible one-electron redox couples, two oxidations and one reduction, and the electrode potentials shift upon varying the substituents. A linear relationship is observed when the Hammett constants are plotted against the redox potentials.
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Affiliation(s)
- Ching-Kuo Kuo
- Department of Chemistry, National Taiwan University, Taipei, Taiwan
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42
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Sanz Miguel PJ, Lippert B. Cationic tetrakis(nucleobase)complexes of PtII as metalloligands and potential building blocks for molecular architectures. Dalton Trans 2005:1679-86. [PMID: 15852118 DOI: 10.1039/b502251g] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Three cationic tetrakis(nucleobase) complexes of Pt(II) have been synthesized: [Pt(Hmhyp-N7)4](NO3)2.H2O 1, [Pt(Hegua-N7)4](NO3)2.2KNO(3).5H2O and trans-[Pt(Hmcyt-N3)2(Hegua-N7)2](NO3)2 3 (Hmhyp = 9-methylhypoxanthine, Hegua = 9-ethylguanine, Hmcyt = 1-methylcytosine). The X-ray crystal structure of has been determined. All three cationic compounds rapidly react with Hg(II), but gel formation prevented an adequate characterization of the products formed. However, a Cu(II) adduct of was isolated in crystalline form and characterized crystallographically. [{(H2O)Cu(Hmhyp)4Pt}2Cu(ClO4)4)](ClO4)2(NO3)4.6H2O crystallizes in a centrosymmetric Cu-Pt-Cu-Pt-Cu chain structure with Cu-Pt separations of 2.791(1)A(outside) and 3.8980(9)A(inside). Two of the three Cu(II) ions are bound via exocyclic O(6) sites of the Hmhyp nucleobases. At neutral and moderate alkaline pH both and form virtually insoluble precipitates, which redissolve at strongly alkaline pH to give eventually anionic [Pt(L)4]2- species (L = mhyp, egua). Finally, interacts with complementary Hmcyt to give Watson-Crick associates, as demonstrated by 1H NMR spectroscopy in DMSO-d(6).
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Rüffer T, Ohashi M, Shima A, Mizomoto H, Kaneda Y, Mashima K. Unique Oxidative Metal−Metal Bond Formation of Linearly Aligned Tetranuclear Rh−Mo−Mo−Rh Clusters. J Am Chem Soc 2004; 126:12244-5. [PMID: 15453739 DOI: 10.1021/ja046552p] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Reaction of Mo2(pyphos)4 (1) with [RhCl(CO)2]2 followed by treatment of excess amounts of tBuNC resulted in the clean formation of [Mo2Rh2(tBuNC)4(pyphos)4](X)2 (4a; X = Cl). The X-ray diffraction study as well as spectroscopic analyses of 4c (X = BPh4) implied that there is no direct sigma-bonding interaction between each Rh(I) atom and the Mo2 core. Each Rh(I) atom in 4 can be oxidized concurrently by 2 equiv of [Cp2Fe]PF6 to afford [Mo2Rh2(Cl)2(tBuNC)4(pyphos)4](PF6)2 (5) along with the formation of two Mo-Rh(II) single bonds and the reduction of the bond orders of the Mo-Mo moiety.
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Affiliation(s)
- Tobias Rüffer
- Department of Chemistry, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
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Kiehl P, Rohmer MM, Bénard M. Electron Delocalization in Nickel Metallic Wires: A DFT Investigation of Ni3(dpa)4Cl2 and [Ni3(dpa)4]3+ (dpa = Dipyridylamide) and Extension to Higher Nuclearity Chains. Inorg Chem 2004; 43:3151-8. [PMID: 15132621 DOI: 10.1021/ic040011j] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The electronic structure of Ni(3)(dpa)(4)Cl(2) (1) has been investigated within the framework of the density functional theory (DFT), using two types of exchange-correlation functionals and various basis sets. The "broken-symmetry" approach proposed by Noodleman for the characterization of electronic states displaying an antiferromagnetic coupling has been applied to 1. All calculations lead to the conclusion that the ground state results from an antiferromagnetic coupling between the terminal Ni atoms, both displaying a high-spin electronic configuration. The central Ni atom is in a low-spin configuration, but is involved in a superexchange interaction connecting the two magnetic centers. These results are in agreement with the assignments recently proposed by the group of F. A. Cotton on the basis of magnetic measurements. It is shown that the ground state electronic configuration calculated for 1 provides the trinickel framework with some delocalized sigma bonding character. The observed geometry of 1 is accurately reproduced by the broken-symmetry solution. The doublet ground state assigned to the oxidized species [Ni(3)(dpa)(4)](3+) (2) and the dramatic contraction of the coordination sphere of the terminal metals observed upon oxidation are also confirmed by the calculations. However, the formal Ni-Ni bond order is not expected to increase in the oxidized species. The contraction of the Ni-Ni distance in 2 is shown to result in part from the vanishing of the important trans influence originating in the axial ligands, and for the rest from a more efficient shielding of the metal nuclear charge along the Ni-Ni-Ni axis. The conclusions deduced from the analysis of the bonding in 1 and 2 can be extended to their homologues with higher nuclearity. More specifically, it is predicted that the single occupancy of the most antibonding sigma orbital, extending over the whole metal framework, will provide the (Ni(p))(2)(p)(/(2)(p)(+1)+) chains with some delocalized bonding character and, possibly, with electrical conduction properties.
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Affiliation(s)
- Pascal Kiehl
- Laboratoire de Chimie Quantique, UMR 7551, CNRS and Université Louis Pasteur, 4 rue Blaise Pascal, F-67000 Strasbourg, France
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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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46
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Paine T, Rentschler E, Weyhermüller T, Chaudhuri P. Polynuclear Nickel(II) Complexes: Preparation and Magnetic Properties of NiII4, NiII5, and NiII6 Species with Ligands containing O∩X∩O (X = S, Se or N) Donor Atoms. Eur J Inorg Chem 2003. [DOI: 10.1002/ejic.200300164] [Citation(s) in RCA: 80] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Berry JF, Cotton FA, Lei P, Lu T, Murillo CA. Additional steps toward molecular scale wires: Further study of Ni(5)(10/11+) chains embraced by polypyridylamide ligands. Inorg Chem 2003; 42:3534-9. [PMID: 12767190 DOI: 10.1021/ic034071l] [Citation(s) in RCA: 103] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
This paper presents two advances in the development of the chemistry of extended metal atom chains (EMACs) that employ di(2-pyridyl)amide (dpa) and its higher homologues (loosely called polypyridylamides). As EMACs employing these ligands are extended to greater lengths, low solubility becomes an increasingly difficult problem. Also, increased stability would be desirable. We have employed a method, which is designed to be applicable to chains of any length, to introduce stabilizing substituents (ethyl groups) on some of the pyridyl rings. We illustrate this here by the synthesis and characterization of the pentanickel complexes Ni(5)(etpda)(4)Cl(2).6CHCl(3) and [Ni(5)(etpda)(4)](PF(6))(3).4Me(2)CO, etpda = the anion of N,N'-bis(4-ethylpyridyl)-2,6-diaminopyridine. As we had previously predicted, on the basis of the behavior of Ni(3)(dpa)(4)Cl(2) and [Ni(3)(dpa)(4)](PF(6))(3), oxidation causes marked changes in structure and magnetic behavior indicative of a change of electronic structure that would cause an insulator-conductor transformation. We now demonstrate that this is what occurs not only in the previously known Ni(5) compounds but in the new ethyl-substituted ones.
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Affiliation(s)
- John F Berry
- Laboratory for Molecular Structure and Bonding, Department of Chemistry, Texas A&M University, College Station, Texas 77843-3255, USA
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Berry JF, Cotton FA, Daniels LM, Murillo CA, Wang X. Oxidation of Ni3(dpa)4Cl2 and Cu3(dpa)4Cl2: nickel-nickel bonding interaction, but no copper-copper bonds. Inorg Chem 2003; 42:2418-27. [PMID: 12665379 DOI: 10.1021/ic0262740] [Citation(s) in RCA: 106] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Of the known trinuclear dipyridylamido complexes of the first-row transition metals, M(3)(dpa)(4)Cl(2) (dpa is the anion of di(2-pyridyl)amine, M = Cr, Co, Ni, Cu), the one-electron-oxidation products of only Cr(3)(dpa)(4)Cl(2) and Co(3)(dpa)(4)Cl(2) have been isolated previously. Here we report one-electron-oxidation products of Ni(3)(dpa)(4)Cl(2) (1) and Cu(3)(dpa)(4)Cl(2) (3): Ni(3)(dpa)(4)(PF(6))(3) (2) and [Cu(3)(dpa)(4)Cl(2)]SbCl(6) (4). While there are no Ni-Ni bonds in 1, the Ni-Ni distances in 2 are 0.15 A shorter than those in 1, very suggestive of metal-metal bonding interactions. In contrast, the oxidation of 3 to 4 is accompanied by a lengthening of the Cu-Cu distances, as expected for an increase in electrostatic charge between positively charged nonbonded metal ions, which is further evidence against Cu-Cu bonding in either 3 or 4. A qualitative model of the electronic structures of all [M(3)(dpa)(4)Cl(2)](n+) (n = 0, 1) compounds is presented and discussed.
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Affiliation(s)
- John F Berry
- Department of Chemistry and Laboratory for Molecular Structure and Bonding, PO Box 30012, Texas A&M University, College Station, Texas 77842-3012, USA
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