Abstract
Energy transfer from tris(4,7-diphenyl-1,10-phenanthroline)ruthenium(II) perchlorate (denoted by Ru(II)) to tris(4,7-diphenyl-1,10-phenanthroline)osmium(II) perchlorate (denoted by Os(II)) has been studied in cast and Langmuir−Blodgett (LB) films. The work is focused on the packing effects of chiral metal complexes on energy-transfer rates. Three kinds of films were prepared: a cast film of a 100:1 mixture of Λ-Ru(II) and Λ-Os(II) (or Δ-Os(II)) (sample 1), a Y-type LB film of a 100:1 mixture of Λ-Ru(II) and Λ-Os(II) (or Δ-Os(II)) (sample 2), and an alternative Y-type LB film of Λ-Ru(II) and Λ-Os(II) (or Δ-Os(II)) monolayers (sample 3). In all of these samples, stearic acid (SA) is added at a molecular ratio of [SA]/[Ru(II)] = 3 to stabilize a monolayer state. From the analyses of the decay curves of excited Os(II) (denoted by Os(II)*), the apparent unimolecular energy-transfer rate constant from excited Ru(II) (denoted by Ru(II)*) to Os(II), k2, is determined. As a result, k2 is found to be larger for Λ-...
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