Thermohalochromism of phenolate dyes conjugated with nitro-substituted aryl groups
作者:Laura Hermosilla、Marcos Caroli Rezende、Vanderlei Gageiro Machado、Rafaela I. Stock
DOI:10.1016/j.saa.2016.10.017
日期:2017.2
(sodium perchlorate) salts, in hydrogen-bond donating (water, 1-propanol, 1-butanol and 2-propanol) and hydrogen-bond accepting (acetonitrile and dimethylsulfoxide) solvents. Although a positive halochromic response was observed in water for tetraalkylammonium salts, their thermohalochromic behavior was negligible. A negative halochromic behavior was observed for the dyes in all solvents, when the added
在氢键合的有机(四正丁基溴化铵和苄基三乙基铵)盐和无机(高氯酸钠)盐存在下,研究了四种被一个或两个硝基取代的芳基部分缀合的酚盐染料的阳离子卤化和热卤化捐赠(水,1-丙醇,1-丁醇和2-丙醇)和氢键接受(乙腈和二甲基亚砜)溶剂。尽管在水中对四烷基铵盐观察到了正的变色反应,但是它们的热变色行为可以忽略不计。当所添加的阳离子为Na +时,在所有溶剂中,染料均会出现负卤光致变色行为。Δλmaxvs的图。c(Na +)可以估算溶剂化酚盐阳离子对的表观缔合常数。大多数情况下,在25-50°C的温度范围内观察到正的热致变色现象,但极性较小的溶剂2-丙醇和乙腈中位阻较大的酚盐染料除外。通过调用温度对酚盐-阳离子,酚盐-溶剂和阳离子-溶剂相互作用的影响来合理化观察到的变化。