Synthesis, characterization and crystal structure of a novel thiocyanate–ruthenium(II) complex |
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| Authors: | Rgia Maria Cordeiro Brito Alzir Azevedo Batista Javier Ellena Eduardo E Castellano Izaura Cirino Nogueira Digenes Luiz Gonzaga de Frana Lopes Jackson Rodrigues de Sousa Ícaro de Sousa Moreira |
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| Affiliation: | aDepartamento de Química Orgânica e Inorgânica, Universidade Federal do Ceará, Cx. Postal 12200, Campus do Pici s/n, CEP 60455-760, Fortaleza – CE, Brazil;bDepartamento de Química, Universidade Federal de São Carlos, Cx. Postal 676, CEP 13565-905, São Carlos – SP, Brazil;cInstituto de Física de São Carlos-USP, Cx. Postal 780, CEP 13560-970, São Carlos – SP, Brazil |
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| Abstract: | The cis-Ru(dppb)(Me-bipy)(NCS)2], dppb = 1,4-bis (diphenylphosphino)butane, Me-bipy = 4,4′-dimethyl-2,2′-bipyridine, and NCS = thiocyanate, was synthesized and characterized by spectroscopic and electrochemical techniques and its structure was determined by crystal X-ray analysis. The crystal structure reveals that the coordination geometry around the Ru(II) center is distorted octahedron where two molecules of thiocyanate are bonded to the ruthenium through nitrogen atom in cis orientation. The half-wave formal potential value E1/2 = 0.8 V (versus Ag/AgCl) observed is considerable higher than that for the cis-RuCl2(dppb)(Me-bipy)] complex, E1/2 = 0.6 V (versus Ag/AgCl), well illustrating the strong π-acceptor effect the NCS ligand toward the backbonding interaction with the Ru(II) metal center. The MLCT absorption bands of the thiocyanate complex present a higher molar absorptivity (about 12%) compared with the cis-RuCl2(dppb)(Me-bipy)] complex, in the same experimental conditions. These properties make the complex potentially promising for the photosensitization process. |
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| Keywords: | Thiocyanate complex dppb Ruthenium complex |
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