2013年9月11日、九州大学 カーボンニュートラル・エネルギー国際研究所（I²CNER）水素製造研究部門主任研究者の酒井健教授の研究グループは、『Angewandte Chemie International Edition』に研究成果を発表しました。

■　概要

We focus herein on the use of triphenylsilyl (TPS) groups as bulky moieties to prevent ligand substitution and thus further improve the inertness as well as the sensitivity of Ir^III photosensitizers. In our previous studies, TPS groups together with related groups were successfully attached to neutral Ir^III complexes to provide highly efficient organic light-emitting devices.These studies showed that arylsilyl groups, such as TPS groups, provide sufficient steric hindrance to protect typical reactive centers by imparting a so-called “site-isolation effect” to the chromophores. Herein we show that the three aryl rings around the silicon atom of TPS groups are remarkably efficient in protecting the complex from ligand substitution only if the groups are introduced at the N^N site. The enhanced stability of a series of TPS-containing Ir^III photosensitizers are examined in detail in conjunction with their actual photosensitization characteristics in the photoreduction of water.

■　論文

Title:

Highly Efficient Photocatalytic Water Reduction with Robust Iridium(III) Photosensitizers Containing Arylsilyl Substituents (PDF 430K)

Authors: Dong Ryeol Whang, Prof. Ken Sakai, Prof. Soo Young Park^,

DOI: 10.1002/anie.201305684

Publication Date(online): Sep. 11, 2013