A novel binuclear ruthenium complex: spectroscopic and electrochemical characterization, and formation of Langmuir and Langmuir-Blodgett films

Journal of the Brazilian Chemical Society

Oliveira Jr, Osvaldo N.¹  Santos, Poliana M. dos¹  Universidade Federal de São Carlos, São Carlos, Brazil¹  Garcia, Jarem R.¹  Sandrino, B.¹  Universidade de São Paulo, São Carlos, Brazil¹  Batista, Alzir A.¹  Universidade Estadual de Ponta Grossa, Ponta Grossa, Brazil¹  Wohnrath, Karen¹ 

关键词: binuclear ruthenium complexes;    bipyridine;    Langmuir-Blodgett films;    thin films;   

DOI  :  10.1590/S0103-50532006000800022

学科分类：化学（综合）

来源: SciELO

【 摘 要 】

[{RuCl3(dppb)}2(µ-4,4'-bipy)] was prepared from the reaction of the 4,4'-bipyridine and mer-[RuCl3(dppb)].H2O, in good yield. The characteristics of the binuclear complex studied with FT-IR, UV-Vis, EPR and elemental analysis were similar to those of the [RuCl3(dppb)L] (L= N-heterocycle). [{RuCl3(dppb)}2(µ-4,4'-bipy)] is soluble in weakly polar organic solvents, facilitating its use in the production of Langmuir and Langmuir-Blodgett (LB) films production. While the cast films and the complex in solution were red, the LB films were green-bluish, probably due to oxidation of the bisphosphine. The nanostructured nature of the LB films was manifested in electrochemical measurements, as these films exhibited higher peak currents than cast or dip-coated films. For all films, the electrochemical response was dominated by the RuIIIRuIII/RuIIRuII process, which differed from that of the binuclear compound. For the latter, an irreversible process appeared due to formation of new species. The electroactivity of LB films from [{RuCl3(dppb)}2(µ-4,4'-bipy)] also pointed to their possible use in electrochemical devices.

【 授权许可】

Unknown