DETAILED INVESTIGATION ON A NEGATIVE PHOTOCHROMIC SPIROPYRAN

被引：73

作者：

ZHOU, JW ^{[1
]}

LI, YT ^{[1
]}

TANG, YW ^{[1
]}

ZHAO, FQ ^{[1
]}

SONG, XQ ^{[1
]}

LI, EC ^{[1
]}

机构：

[1] ACAD SINICA,INST CHEM,NATL KEY LAB STRUCT STABLE & UNSTABLE SPECIES,BEIJING 100080,PEOPLES R CHINA

来源：

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY | 1995年 / 90卷 / 2-3期

关键词：

SPIROPYRAN; NEGATIVE PHOTOCHROMISM; SOLVATOCHROMISM; PH EFFECT; H-1; NMR;

D O I：

10.1016/1010-6030(95)04082-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：

The negative photochromic properties of a spiropyran are investigated in various solvents and in solutions of different acidity. The results indicate that the polarity of the solvent has a prominent effect on lambda(max) of the coloured merocyanine form (MC), whereas its effects on lambda(max) of the closed form (SP) and on the coloration rates after visible bleaching are very weak. From the effect of acid concentration on the coloration rates the pK(a) of the cis intermediate Y in the coloration process is determined to be about 1.1 lower than that of the protonated merocyanine (MCH(+)). The structures and configurations of MC, SP, MCH(+) and Y are assigned via their H-1 NMR spectra.

引用

页码：117 / 123

页数：7

共 30 条

[1]

BERCOVICI T, 1969, MOL PHOTOCHEM, V1, P189

[2]

Brown GH, 1971, TECHNIQUES CHEM, VIII

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