A tetranuclear cobalt complex with mercaptopyridine N-oxide as ligand. Synthesis and crystal structure of [Na3Co4(μ3-O)2-(mpo)8(DMF)4]Br·2DMF (mpo = 2-mercaptopyridine-N-oxide)
1995; Elsevier BV; Volume: 231; Issue: 1-2 Linguagem: Inglês
10.1016/0020-1693(94)04349-z
ISSN1873-3255
AutoresFeilong Jiang, Maochun Hong, Xiulan Xie, Rong Cao, Bei‐Sheng Kang, Daxu Wu, Hanqin Liu,
Tópico(s)Metal-Catalyzed Oxygenation Mechanisms
ResumoA new compound [Na3Co4(μ3-O)2(mpo)8(DMF)4]Br·2DMF (1) was prepared by reacting CoBr(PPh3)3 and Nampo (mpo = 2-mercaptopyridine-N-oxide), and structurally characterized by X-ray diffraction methods. The title compound crystallizes in the triclinic space group P1̄ with a = 13.393(7), b = 14.00(1), c = 13.029(4) Å, α = 92.29(4), β = 110.56(3), γ = 115.32(4)°, V = 2015(2) Å3, Z = 1 and R (Rw) = 0.047 (0.053) for 1820 reflections (I > 3 σ(I)). The complex contains four cobalt atoms in the form of a square plane with indirect metal-metal bonds. Each Co atom is coordinated by two bidentate mpo ligands with StOb-D and StOb-T coordination modes, respectively. Two Co2(mpo)4O groups each bridged by μ3-O in the Na3Co4 core are linked by Na3 through the oxygen atoms of the mpo ligands and the bridging μ3-O atoms to form a dumbbell-like structure. The structure of the symmetric tetracobalt cation [Na3Co4(μ3-O)2(mpo)8(DMF)4]+ possesses a crystallographic inversion center through the Na(1) atom. The relevance of the spectroscopic and magnetic properties to the structure of 1 is also discussed.
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