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標題: | The nano-scale molecule with the longest delocalized metal-metal bonds: linear heptacobalt(II) metal string complexes Co-7(mu(7)-L)(4)X-2 | 作者: | Wang, W.Z. Ismayilov, R.H. Lee, G.H. Liu, I.P.C. Yeh, C.Y. Peng, S.M. |
關鍵字: | magnetic-properties;tricobalt compounds;crystal-structures;ligands;chains;wires;oxidation;model;ncs;cl | Project: | Dalton Transactions | 期刊/報告no:: | Dalton Transactions, Issue 8, Page(s) 830-839. | 摘要: | A new type of pyrazine-modulated oligo-a-pyridylamino ligands, N-2-(pyrazin-2-yl)-N-6-(6-(pyrazin-2-ylamino)pyridin-2-yl)pyridine-2,6-diamine (H(3)pzpz) (1) and N-2-(pyrazin-2-yl)-N-6-(6-(pyridin-2-ylamino)pyridin-2-yl)pyridine-2,6-diamine (H(3)tpz) (2), were synthesized and characterized by IR, H-1 NMR and MS(FAB). Using 1 and 2, the linear heptacobalt(II) metal string complexes [Co-7(mu(7)-L)(4)X-2] (L = pzpz(3-), X = Cl- (3), NCS- (4); L = tpz(3-), X = Cl- (5), X = NCS- (6)) were synthesized and structurally characterized. The structures showed the shortest Co-Co distance (2.194 angstrom) 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 angstrom. Electrochemical studies showed two reversible oxidations and one reversible reduction, while all the redox reactions of H(3)pzpz complexes, 3 and 4, occurred at higher potentials than H(3)tpz complexes, 5 and 6. The complexes 3-6 are fairly stable to oxidation. Temperature-dependent magnetic research on 3-6 revealed anomalous magnetic behavior with intermediate magnetic moment values between quartet and doublet states, and deviation from the Curie-Weiss law. |
URI: | http://hdl.handle.net/11455/68658 | ISSN: | 1477-9226 | DOI: | 10.1039/b614661a |
Appears in Collections: | 期刊論文 |
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