Complexation Enhanced Excited-State Deactivation by Lithium Ion Coordination to a Borondipyrromethene (Bodipy) Donor-Bridge-Acceptor Dyad
作者:Andrew C. Benniston、Songjie Yang、Helge Lemmetyinen、Nikolai V. Tkachenko
DOI:10.1002/ejoc.201300867
日期:2013.10
aliquots of LiClO4 to a DMF solution of the dyad resulted in alterations to the absorption spectrum associated with the 2,2′-biphenol unit. Changes were modelled as Li+ ions bound to the oxygen atoms of the 2,2′-biphenol to produce 1:1 (Li+/ligand) and 2:1 (Li+/ligand) complexes. The rate constant for excited state quenching is enhanced upon lithium ion binding.
制备了供体-受体二元组,由作为受体的硼二吡咯甲烯(Bodipy)发色团和作为供体的二甲氨基部分组成。这两个基团由 2,2'-联苯酚部分隔开。Bodipy 的激发态通过涉及来自二甲基氨基的捐赠的电子转移而有效猝灭。DMF 中正向电子转移的速率常数测量为大约 2 × 1010 s–1。电荷复合过程超快。将 LiClO4 的等分试样滴定到二元组的 DMF 溶液中,导致与 2,2'-双酚单元相关的吸收光谱发生变化。变化被模拟为 Li+ 离子与 2,2'-双酚的氧原子结合以产生 1:1(Li+/配体)和 2:1(Li+/配体)复合物。激发态猝灭的速率常数在锂离子结合后增强。