Energy barrier to TTC-TTT isomerisation for the merocyanine of a photochromic spiropyran

被引：83

作者：

Hobley, J ^{[1
]}

Malatesta, V ^{[1
]}

机构：

[1] Great Lakes Chem Italia, I-20097 San Donato Milanese, Italy

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2000年 / 2卷 / 01期

关键词：

D O I：

10.1039/a908360j

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 H-1 NMR signal of a proton of a spiropyran photomerocyanine was resolved at low temperature into two signals attributed to the two isomers, TTT and TTC. The equilibrium distribution and free energy difference between the TTT and TTC isomers were calculated to be 0.15 and 4.6 +/- 0.7 kJ mol(-1), respectively. By H-1 NMR lineshape analysis at various temperatures, an activation barrier for the TTC --> TTT isomerisation of 43.6 +/- 3 kJ mol(-1) was calculated.

引用

页码：57 / 59

页数：3

共 12 条

[1] PHOTOCHEMICAL RING-OPENING REACTION OF INDOLINOSPIROPYRANS STUDIED BY SUBPICOSECOND TRANSIENT ABSORPTION [J].

ERNSTING, NP ;

ARTHENENGELAND, T .

JOURNAL OF PHYSICAL CHEMISTRY, 1991, 95 (14) :5502-5509

[2]

GUGLIELMETTI R, 1990, PHOTOCHROMISM MOL SY, pCH8

[3]

Heligman-Rim R., 1962, J PHYS CHEM-US, V66, P2465

[4] Proton exchange and isomerisation reactions of photochromic and reverse photochromic spiro-pyrans and their merocyanine forms [J].

Hobley, J ;

Malatesta, V ;

Millini, R ;

Montanari, L ;

Parker, WON .

PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 1999, 1 (14) :3259-3267

[5]

HOBLEY J, 1998, 17 INT IUPAC C PHOT, P188

[6] THE NUCLEAR OVERHAUSER EFFECT IN STRONGLY COUPLED SPIN SYSTEMS [J].

KEELER, J ;

NEUHAUS, D ;

WILLIAMSON, MP .

JOURNAL OF MAGNETIC RESONANCE, 1987, 73 (01) :45-68

[7] PHOTOCHROMISM OF SPIROOXAZINES .1. INVESTIGATION OF THE PRIMARY PROCESSES IN THE RING-OPENING REACTION BY PICOSECOND TIME-RESOLVED ABSORPTION AND EMISSION-SPECTROSCOPY [J].

SCHNEIDER, S ;

MINDL, A ;

ELFINGER, G ;

MELZIG, M .

BERICHTE DER BUNSEN-GESELLSCHAFT-PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 1987, 91 (11) :1222-1224

[8] TIME-RESOLVED RESONANCE RAMAN STUDIES OF THE PHOTOCHROMIC REACTION OF 6-NITRO-1',3',3'-TRIMETHYLSPIRO[2H-1-BENZOPYRAN-2,2'-INDOLINE] [J].

TAKAHASHI, H ;

MURAKAWA, H ;

SAKAINO, Y ;

OHZEKI, T ;

ABE, J ;

YAMADA, O .

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, 1988, 45 (02) :233-241

[9] RESONANCE RAMAN STUDIES OF TRANSIENT SPECIES IN THE PHOTOCHROMISM OF 1',3',3'-TRIMETHYLSPIRO-[2H-1-BENZOPYRAN-2,2'-INDOLINE] [J].

TAKAHASHI, H ;

YODA, K ;

ISAKA, H ;

OHZEKI, T ;

SAKAINO, Y .

CHEMICAL PHYSICS LETTERS, 1987, 140 (01) :90-94

[10] FEMTOSECOND TRANSIENT ABSORPTION-SPECTROSCOPY OF A SPIROOXAZINE PHOTOCHROMIC REACTION [J].

TAMAI, N ;

MASUHARA, H .

CHEMICAL PHYSICS LETTERS, 1992, 191 (1-2) :189-194

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