DYE-SENSITIZED OXIDATION OF TETRAMETHYLPIPERIDINES (HALS) TO N-OXYLS

被引：6

作者：

HEPP, MG ^{[1
]}

KRAMER, HEA ^{[1
]}

机构：

[1] UNIV STUTTGART,INST PHYS CHEM,D-70569 STUTTGART,GERMANY

来源：

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY | 1994年 / 78卷 / 01期

关键词：

D O I：

10.1016/1010-6030(93)03713-Q

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Flash photolysis and electron paramagnetic. resonance (EPR) measurements show that, at high concentrations (1.28 M in methanol, p(H)(M) 11.3) of 4-hydroxy-2,2,6,6-tetramethylpiperidine (HTEMP, hindered amine light stabilizer, HALS), the oxidation product 4-hydroxy-2,2,6,6-tetramethylpiperidine-N-oxyl (TEMPOL) is formed according to a type I (radical) mechanism (and not via the competing type II (singlet oxygen) photo-oxygenation mechanism) when the dyes 9-methyllumiflavin and thionine are used as sensitizers. These dyes exhibit high electron affinity in photoreactions.

引用

页码：19 / 29

页数：11

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