Interplay of Light Antenna and Excitation “Energy Reservoir” Effects in a Bichromophoric System Based on Ruthenium−Polypyridine and Pyrene Units Linked by a Long and Flexible Poly(ethylene glycol) Chain
作者:Angeles Farrán Morales、Gianluca Accorsi、Nicola Armaroli、Francesco Barigelletti、Simon J. A. Pope、Michael D. Ward
DOI:10.1021/ic025811d
日期:2002.12.1
case of complex 2, the linking chain in the extended conformation is as long as 21 A. Direct excitation of the pyrene unit (lambda(exc) = 410 nm) results in singlet-to-singlet energy transfer (an antenna effect) to the Ru-based component, (1)pyr --> (1)MLCT, which we analyze in terms of the Förster mechanism taking place with unit efficiency. Analysis of the time-resolved pyrene fluorescence reveals that