期刊
JOURNAL OF ORGANOMETALLIC CHEMISTRY
卷 690, 期 8, 页码 2133-2141出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jorganchem.2005.01.022
关键词
phthalocyanine; photostability; electrospray mass spectrometry; ruthenium; ruthenium monosulfophthalocyanine
The thermal and photochemical stabilities were investigated for tetrasulfophthalocyanines of Cu, Co, Ni, Fe and Ru (MPcS) and for two mono sulfophthalocyanines of Ru, either without (RuPcS1) or with the coordination of two units of DMSO in apical positions ([RuPcS1(DMSO)(2)]DMSO). The thermal degradation of all of the studied complexes never showed the formation of spectroscopically detectable intermediates. CuPcS was the most stable complex, while all of the Ru-sulfophthalocyanines were particularly prone to thermal degradation. Photodegradation showed a better selectivity, and as with thermal degradation, the order of reactivity goes from the most stable CuPcS, to the least stable Ru-sulfophthalocyanines (RuPcS, RuPcS1 and [RuPcS(DMSO)(2)]DMSO). In particular, when the RuPcS complex was irradiated, a stable intermediate was detected that had an absorption band at 532 nm and a mass spectrum attributable to the tetrasulfophthalocyanine from oxidative ring cleavage by the action of the singlet oxygen formed via (1)*RuPcS photo sensitization. The most probable molecular formula demonstrates a new complex, with a cleaved ring containing an -N=O group and two -OH groups that are all bonded at the two extremities of the open-chain molecule. (c) 2005 Published by Elsevier B.V.
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