Abstract
We used time-correlated single photon counting and Femtosecond Transient Absorption to investigate two photoinduced electron transfer dialkylsilylene-spaced monomer . The aniline is the electron Donor, trans-stilbene is the electron Acceptor and SiMe2 as a spacer.This monomer has two conformer anti and syn. We excited DA with a 266 nm laser beam. In non-polar solvents, The observed lifetimes, arranged from short to long are assigned to, the energy transfer lifetime of trans-stilbene (τ_1^TA) is around 1-3 ps, aniline relaxation lifetime between 1ππ* and 2ππ* (τ_2^TA) is around 60-100 ps and the aniline and trans-stilbene fluorescence lifetime (τ_3^TA) are 1 ns and 4 ns. In slightly polar solvents, we detect the charge transfer state (CT state) absorption. The observed lifetimes, arranged from short to long are assigned to, the energy transfer and the first charge transfer state lifetime (τ_1^TA) is around 0.5 ps and a rise lifetime (_2^(r,TA)) is around 2-8 ps, the second charge transfer state lifetime of anti to syn (τ_3^TA) and the charge transfer state decay lifetime (τ_4^TA) is 10 ns. In polar solvents, we detect four exponential decay. The observed lifetimes, arranged from short to long are assigned to, the lifetime of energy transfer and the formation of charge transfer state is ultrashort at_1^(,TA)= 0.2-0.6 ps and a rise lifetime _2^(r,TA) = 0.8-2 ps, the second charge transfer state lifetime of anti to syn (τ_3^TA) is around 18-30 ps and the charge recombination lifetime (τ_4^TA) is around 145-270 ps. In polar and high viscosity solvents,we find syn charge transfer state decay lifetime (_5^(,TA)) around 400~1500 ps. The experimental results imply the efficient charge transfer of this monomer in polar environments. This dialkysilylene-spaced monomer is suitable for using in photoinduced electron transfer materials.