Thermal stability and photostability of water solutions of sulfophthalocyanines of Ru(II), Cu(II), Ni(II), Fe(III) and Co(II)

被引:25
作者
d'Alessandro, N
Tonucci, L
Morvillo, A
Dragani, LK
Di Deo, M
Bressan, A
机构
[1] Univ G DAnnunzio, Dept Sci, Pescara, Italy
[2] Univ Padua, Dept Inorgan Chem, I-35100 Padua, Italy
[3] Consorzio Mario Negri Sud, Analyt Biochem Unit, I-66030 Santa Maria Imbaro, Chieti, Italy
关键词
phthalocyanine; photostability; electrospray mass spectrometry; ruthenium; ruthenium monosulfophthalocyanine;
D O I
10.1016/j.jorganchem.2005.01.022
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
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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页码:2133 / 2141
页数:9
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