ACCEPTOR PROPERTIES OF SOLVENTS - THE USE OF ISOKINETIC RELATIONSHIPS TO ELUCIDATE THE RELATIONSHIP BETWEEN THE ACCEPTOR NUMBER AND THE SOLVATOCHROMISM OF N-PHENOLATE BETAINE DYES
ACCEPTOR PROPERTIES OF SOLVENTS - THE USE OF ISOKINETIC RELATIONSHIPS TO ELUCIDATE THE RELATIONSHIP BETWEEN THE ACCEPTOR NUMBER AND THE SOLVATOCHROMISM OF N-PHENOLATE BETAINE DYES
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DOI：
10.1039/p29930001415
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发表时间：
1993-08-01
期刊：
影响因子：
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通讯作者：
JAMESON, RF
中科院分区：
文献类型：
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作者：
LINERT, W;JAMESON, RF
研究了吡啶n -苯氧基甜菜碱染料甜菜碱1和甜菜碱2在不同溶剂和温度范围内的热致变色性，结果表明它们具有等参数（等动力学）关系（IKR）。（使用亲脂性更强的甜菜碱2使溶剂的范围扩大到涵盖甜菜碱1不溶的极极性溶剂。）这些IKRs导致鉴定出五种不同的溶剂组，每组显示出不同的溶质-溶剂和溶剂-溶剂机制，并由其官能团表征。根据理论要求，相应的T（iso）值与远红外吸收有关，这是反应热浴的特征，在这些系统中发现这是甜菜本身。这些组反映在Reichardt的E(T)值和Gutmann的受体数（AN）之间的关系中，该关系被重新研究，每个组显示在E(T)与AN图中的一系列平行线上。结果表明，受体参数在很大程度上取决于用于获得它们的探针的施主性质。
The thermochromism of the pyridinium N-phenoxide betaine dyes, betaine 1 and betaine 2, has been studied in different solvents and over a range of temperatures and shown to yield isoparametric (isokinetic) relationships (IKR). (The use of the more lipophilic betaine 2 enabled the range of solvents to be extended to cover very apolar solvents in which betaine 1 is insoluble.) These IKRs led to the identification of five different groups of solvents, each group showing different solute-solvent and solvent-solvent mechanisms and being characterised by their functional groups. The corresponding T(iso) values are, as demanded by theory, related to far-IR absorptions that are characteristic of reaction heat baths, which in these systems are found to be the betaines themselves. These groups are reflected in the relationship between Reichardt's E(T) values and Gutmann's acceptor numbers (AN) which is reinvestigated and each group shown to lie on one of a series of parallel lines in the E(T) vs. AN plot. It is demonstrated that acceptor parameters depend strongly on the donor properties of the probe used to obtain them.