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首页> 外文期刊>Spectrochimica acta, Part A. Molecular and biomolecular spectroscopy >Spectrophotometric study of interaction of 2,3-dichloro-5,6-dicyano-1,4-benzoquinone with diaza-18-crown-6 and diaza-15-crown-5 in acetonitrile and chloroform solutions
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Spectrophotometric study of interaction of 2,3-dichloro-5,6-dicyano-1,4-benzoquinone with diaza-18-crown-6 and diaza-15-crown-5 in acetonitrile and chloroform solutions

机译：分光光度法研究乙腈和氯仿溶液中2,3-二氯-5,6-二氰基-1,4-苯醌与diaza-18-crown-6和diaza-15-crown-5的相互作用

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摘要

Interactions of diaza-18-crown-6 and diaza-15-crown-5, as electron donors, with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ), as an electron acceptor, have been investigated spectrophotometrically in acetonitrile and chloroform solutions. The results indicated immediate formation of an electron donor-electron acceptor complex DA:D + A (kf)reversible arrow(fast) DAwhich is followed by two relatively slow consecutive reactions:DA (k1)--> D(+)A(-) (k2)--> ProductThe pseudo-first-order rate constants for the formation of the ionic intermediate and the final product have been evaluated at various temperatures by computer fitting of the absorbance time data to appropriate equations. The formation constants of the resulting DA complexes have also been determined. The influences of both the azacrown's structure and the solvent properties on the formation of DA complexes and the rates of subsequent reactions are discussed. (C) 2004 Elsevier B.V. All rights reserved.
机译：作为电子给体的diaza-18-crown-6和diaza-15-crown-5与作为电子受体的2,3-二氯-5,6-二氰基-1,4-苯醌（DDQ）的相互作用具有用乙腈和氯仿溶液分光光度法进行了研究。结果表明立即形成电子给体-电子受体复合物DA：D + A（kf）可逆箭头（快速）DA，随后发生两个相对缓慢的连续反应：DA（k1）-> D（+）A（- ）（k2）->乘积通过计算机将吸收时间数据拟合为适当的方程式，已在各种温度下评估了形成离子中间体和最终产物的拟一级反应速率常数。还确定了所得DA复合物的形成常数。讨论了氮杂冠结构和溶剂性质对DA配合物形成及后续反应速率的影响。 （C）2004 Elsevier B.V.保留所有权利。

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