Evidence for Interfacial Halogen Bonding

被引：34

作者：

Swords, Wesley B. ^{[1
]}

Simon, Sarah J. C. ^{[2
,3
]}

Parlane, Fraser G. L. ^{[2
,3
]}

Dean, Rebecca K. ^{[2
,3
]}

Kellett, Cameron W. ^{[2
,3
]}

Hu, Ke ^{[1
]}

Meyer, Gerald J. ^{[1
]}

Berlinguette, Curtis P. ^{[2
,3
]}

机构：

[1] Univ N Carolina, Dept Chem, Murray Hall 2202B, Chapel Hill, NC 27599 USA

[2] Univ British Columbia, Dept Chem, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada

[3] Univ British Columbia, Dept Chem & Biol Engn, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2016年 / 55卷 / 20期

基金：

美国国家科学基金会;

关键词：

dyes; halogen bonding; inorganic chemistry; semiconductor interfaces; reaction kinetics; SENSITIZED SOLAR-CELLS; ANION RECOGNITION; CHARGE RECOMBINATION; ENERGY CONVERSION; ELECTRON-TRANSFER; DYE REGENERATION; CHEMISTRY; NANOPARTICLES; SPECTROSCOPY; COMPLEXES;

D O I：

10.1002/anie.201510641

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A homologous series of donor--acceptor dyes was synthesized, differing only in the identity of the halogen substituents about the triphenylamine (TPA; donor) portion of each molecule. Each Dye-X (X=F, Cl, Br, and I) was immobilized on a TiO2 surface to investigate how the halogen substituents affect the reaction between the light-induced charge-separated state, TiO2(e(-))/Dye-X+, with iodide in solution. Transient absorption spectroscopy showed progressively faster reactivity towards nucleophilic iodide with more polarizable halogen substituents: Dye-F < Dye-Cl < Dye-Br < Dye-I. Given that all other structural and electronic properties for the series are held at parity, with the exception of an increasingly larger electropositive sigma-hole on the heavier halogens, the differences in dye regeneration kinetics for Dye-Cl, Dye-Br, and Dye-I are ascribed to the extent of halogen bonding with the nucleophilic solution species.

引用

页码：5956 / 5960

页数：5

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