Intrachain Electron and Energy Transfer in Conjugated Organometallic Oligomers and Polymers

摘要

The synthesis of polymers of the type (-Cz-C C-PtL2-C C-Cz-X-)(n) along with the corresponding model compounds (Ph-PtL'(2)-C C-Cz)(2)-X-, where Cz=3,3'-carbazole, X = nothing, Cz, or F (2,2'-fluorene), L=PBu3, and L'=PEt3 are reported. The electronic spectra (absorption, excitation, emission, and ns-transient spectra) and the photophysics of these species in 2-methyltetrallyrofuran (2MeTHF) at 298 and 77 K are presented. Evidence for singlet electron and triplet energy transfer from the Cz chromophore to the F moiety are provided and discussed in detail. The rate for electron transfer is very fast (>4x10(11) s(-1)), whereas that for triplet-triplet energy transfer is much slower (approximate to 10(3) s(-1)). This work represents a very rare example of studies that address electronic communication in the backbone of a conjugated organometallic polymer.