摘要
设计构建了以羧脒盐桥联接的二苯酮和萘超分子体系,NA-(脒基-羧基)-BP和NA-(羧基-脒基)-BP,以及相应的模型体系.稳态和时间分辨荧光光谱研究表明,置于羧脒盐桥两端的萘和二苯酮基团之间可以发生有效的单重态能量传递,超分子体系NA-(脒-羧)-BP(NA-Am/BP-COOH=1/1)和NA-(羧-脒)-BP(NA-COOH/BP-Am=1/1)中单重态能量传递效率分别为0.998和0.970,速率常数分别为6.8×1010和1.5×1010s-1.推断羧脒盐桥介导了超分子体系中单重态能量传递过程并具备方向性性质,单重态能量传递"通过键"以电子交换机制进行.
The amidinium-carboxylate salt bridge systems bearing a pair of energy transfer donor （naphthalene, NA） and acceptor （benzophenone, BP）, NA-（amidinium-carboxylate）-BP and NA-（carboxlateamidinium）-BP, were constructed. Steady state and time-resolved fluorescence studies demonstrate that the singlet-singlet energy transfer from NA to BP can occur efficiently with efficiencies of 0.998, 0.970 and rate constants of 6.8 ×10^10 and 1.5 × 10^10 s^-1 for NA-（amidinium-carboxylate）-BP （NA-Am/BP-COOH： 1/1） and NA-（carboxylate-amidinium）-BP （NA-COOH/BP-Am = 1/1）, respectively. We infer that the singlet-singlet energy transfer proceeds via a ＂through-bond＂ electron exchange mechanism, and the amidinium-carboxylate salt bridge mediates the energy transfer process with directionality.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2009年第13期1481-1486,共6页
Acta Chimica Sinica
基金
国家自然科学基金(Nos20603042
20733007
20772134)
科技部国家重点基础研究发展规划(No2007CB808004)资助项目
关键词
羧脒盐桥
能量传递
二苯酮
萘
amidinium-carboxylate salt bridge
energy transfer
benzophenone
naphthalene
