Photoreversible Zn
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Ion Transportation Across an Interface Using Ion‐Chelating Substituted Photochromic 3,3′‐Indolospirobenzopyrans: Steric and Electronic Controlling Effects
作者:Craig J. Roxburgh、Peter G. Sammes、Ayse Abdullah
DOI:10.1002/ejic.200800614
日期:2008.11
been realised. Additionally, the spiropyran ring-opening↔closing reactions of two skeletally identical spirobenzopyrans 4 and 5, but possessing "electronically-modifying" 5-trifluoromethyl-substitutents have been studied by 1 H NMR spectroscopy: this has enabled us to realise the additional biasing, on the ring-opening↔closing process, excerpted on these systems through both selectively placed, inductively
Unusual thermo(photo)chromic properties of some mononitro- and dinitro- substituted 3′-alkyl indolospirobenzopyrans
作者:Ayse Abdullah、Thomas G. Nevell、Peter G. Sammes、Craig J. Roxburgh
DOI:10.1016/j.dyepig.2015.04.027
日期:2015.10
Isomeric equilbria of dinitro-substituted indolospirobenzopyrans, possessing 3′-gem-methyl- or 3′-cyclohexyl-substitutents, have been investigated using 1H NMR spectroscopy at six temperatures, ranging from 298 K to 410 K; isomerisation processes in a methanolic solution have been monitored by spectrophotometry. For the mononitro-substituted compounds, equilibrium favoured the colourless spirocyclic
使用1 H NMR光谱在298 K至410 K的六个温度下研究了具有3'-宝石-甲基-或3'-环己基取代基的二硝基取代的吲哚螺并苯并吡喃的异构异构体。甲醇溶液中的异构化过程已通过分光光度法进行了监测。 对于单硝基取代的化合物,平衡有利于无色螺环异构体。UV辐射产生的有色花菁异构体的还原遵循一级动力学。对于二硝基取代的化合物,有色的花菁异构体占主导。在通过可见光光辐射脱色之后,向花青结构的回复特别缓慢,吸光度异常地呈S形增加。紫外线。宝石-甲基-1和3'-环己基取代的系统的光谱观察2 在质量上与两个相对较慢的速率确定步骤同时进行有关,它们具有形成缓慢且寿命长的中间体-假定为螺环结构的氧质子化吡喃环和TCC花青素异构体,后者在相对快的过程中经历了相对较慢的异构化。 TTC异构体的中心β-烯烃键。