PHOTOSENSITIZED PRODUCTION OF VIOLOGEN CATION RADICAL

摘要

PURPOSE:To obtain the title radical, useful for the production of hydrogen by the sunlight, readily and rapidly, by irradiating a viologen with visible light using an alcohol as reducing agent and a poly(pyridyl)ruthenium complex as a photosensitizer. CONSTITUTION:The production of a viologen cation radical by irradiating a viologen with visible light, can be accelerated by using an inexpensive and easily available alcohol as reducing agent and a poly(pyridyl)ruthenium complex of the formula I (L is a coordinator of ruthenium, e.g. alpha,alpha'-bipyridyl, alpha,alpha',alpha''-terpyridyl, o- phenanthroline, and their substituted derivatives; X- is halogen ion; m is an integer of 1, 2, 3; n is an integer of 0-20) as a photosensitizer. The above radical can be used for the production of hydrogen by the chemical transformation of the solar energy.