Ultrafast Excimer Formation and Solvent Controlled Symmetry Breaking Charge Separation in the Excitonically Coupled Subphthalocyanine Dimer

被引：49

作者：

Roy, Palas ^{[1
]}

Bressan, Giovanni ^{[2
]}

Gretton, Jacob ^{[1
]}

Cammidge, Andrew N. ^{[1
]}

Meech, Stephen R. ^{[1
]}

机构：

[1] Univ East Anglia, Sch Chem, Norwich NR4 7TJ, England

[2] Imperial Coll London, Dept Life Sci, London SW7 2BX, England

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2021年 / 60卷 / 19期

基金：

英国工程与自然科学研究理事会;

关键词：

excimer; excited states; subphthalocyanine; symmetry breaking charge separation; ultrafast dynamics;

D O I：

10.1002/anie.202101572

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Knowledge of the factors controlling excited state dynamics in excitonically coupled dimers and higher aggregates is critical for understanding natural and artificial solar energy conversion. In this work, we report ultrafast solvent polarity dependent excited state dynamics of the structurally well-defined subphthalocyanine dimer, mu-OSubPc(2). Stationary electronic spectra demonstrate strong exciton coupling in mu-OSubPc(2). Femtosecond transient absorption measurements reveal ultrafast excimer formation from the initially excited exciton, mediated by intramolecular structural evolution. In polar solvents the excimer state decays directly through symmetry breaking charge transfer to form a charge separated state. Charge separation occurs under control of solvent orientational relaxation.

引用

页码：10568 / 10572

页数：5