Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, USA.
J Phys Chem B. 2010 Sep 16;114(36):11731-6. doi: 10.1021/jp104836k.
Femtosecond time-resolved absorption spectroscopy has been used to study the excited-state charge transfer dynamics in a set of self-assembled cyclic Fe(II)-bisterpyridine compounds with different π-conjugated ligands. By analyzing the dynamics, the internal conversion process involving a ligand-centered π-π* state to a lower lying metal-to-ligand charge transfer (MLCT) state was investigated. This is followed by intersystem crossing to the lowest MLCT state, which was found to occur at the ∼100 fs time scale. Vibrational cooling in the lowest MLCT state was found to occur on the 10s of femtoseconds time scale. The lowest MLCT state had an excited-state lifetime longer than 5 ns, indicating the possibility of light-induced excited-state spin trapping (LIESST).
飞秒时间分辨吸收光谱已被用于研究一系列具有不同π共轭配体的自组装环状 Fe(II)-联吡啶化合物中的激发态电荷转移动力学。通过分析动力学，研究了涉及配体中心π-π*态到较低的金属-配体电荷转移（MLCT）态的内转换过程。随后发生系间窜越至最低 MLCT 态，发现在约 100 fs 的时间尺度上发生。在最低 MLCT 态中发生的振动冷却发生在 10 飞秒的时间尺度上。最低 MLCT 态的激发态寿命长于 5 ns，表明存在光诱导激发态自旋捕获（LIESST）的可能性。
