Abstract
The luminescence quenching of excited Tris(2,2-bipyridine)ruthenium(II) ions by trans-[RuCl 2{P(OR) 3} 4] complexes with different alkyl chain ligands (R=C 2H 5, C 2H 5Cl, n C 4H 9, iC 3H 7 o-tolyl and tC 4H 9) was investigated. None of the acceptor Ru(II) phosphite complexes were luminescent, and the rate constants of the bimolecular system were determined within the range of 1.15 and 0.28×10 8 M −1 s −1 for R=C 2H 5 and tC 4H 9, respectively. The results indicate a direct effect of the alkyl chains in the rate constants, showing a decrease of k q as a function of increased of the alkyl chains (R) in the ruthenium(II) tetraphosphite complexes. The greater the R group content in the phosphite ligand, the more difficult the electron transfer is.
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