Bimetallic transition metal-ruthenium(II) complexes containing bridging bipyrimidine ligands

resumo

The ruthenium(II) complex [Ru([14]aneS(4))(bpym)](BF4)(2) ([14]aneS(4) = 1,4,8,11-tetrathiacyclotetradecane, bpym = 2,2-bipyrimidine) has been prepared by substitution of the labile acetonitrile ligands in the complex [Ru([14]aneS(4))(CH3CN)(2)](BF4)(2) by bpym. Both the precursor acetonitrile complex and the polypyridyl complex were characterised by Ru K-edge EXAFS spectroscopy. In addition, the crystal structures of [Ru([14]aneS(4))(bpym)](X)(2) (X = BF4, PF6) were determined by X-ray diffraction. The bpym-bridged bimetallic complexes [{Ru([14]aneS(4))}(2)(bpym)](BF4)(4) and [{([14]aneS(4))Ru}(bpym){ReO3Me}](BF4)(2) were prepared using the ruthenium(II) monomeric bpym complex as starting material. In the case of the complex containing methyltrioxorhenium(VII) coordination of both metal centres to the bidentate bridging ligand was supported by a combination of Ru K-edge and Re L-edge XAFS spectroscopy, in addition to H-1 NMR. (C) 2003 Elsevier Science Ltd. All rights reserved.

palavras-chave

LEWIS BASE ADDUCTS; RUTHENIUM(II) COMPLEXES; SPECTROSCOPY; REDOX; EXAFS; NMR

categoria

Chemistry; Crystallography

autores

Nunes, CD; Pillinger, M; Hazell, A; Jepsen, J; Santos, TM; Madureira, J; Lopes, AD; Goncalves, IS

nossos autores

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