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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Rotational Dynamics of Nondipolar Probes in Butanols: Correlation of Reorientation Times with Solute-Solvent Interaction Strengths
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Rotational Dynamics of Nondipolar Probes in Butanols: Correlation of Reorientation Times with Solute-Solvent Interaction Strengths

机译：丁醇中非偶极探针的旋转动力学：重定向时间与溶质-溶剂相互作用强度的相关性

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摘要

Rotational relaxation of two structurally similar nondipolar solutes,2,5-dimethyl-l,4-dioxo-3,6-diphenylpyrrolo-[3,4-c]pyrrole(DMDPP)and l,4-dioxo-3,6-diphenylpyrrolo[3,4-c]pyrrole(DPP),has been examined in four isomeric butanols as a function of temperature in order to find out how the rotation of the solute molecules is influenced by the solute-solvent interaction strength.It has been observed that the hydrogen bonding interactions with the butanols do not influence the rotation of DMDPP.On the other hand,the rotation of DPP is affected by its interactions with the solvents,and as a result the reorientation times of DPP have been found to be over a factor of 2 longer than that of DMDPP.Two sets of reorientation times have been obtained,one corresponding to DMDPP and the other to DPP,when the reorientation times of both probes were normalized by the solvent viscosities.The observed pattern is a consequence of almost identical interaction strengths between the four isomeric butanols and the given probes.These results indicate that the relative differences in the hydrogen bond donating abilities of the butanols do not manifest in the measured reorientation times of the solute molecules.
机译：两种结构相似的非偶极溶质，2,5-二甲基-1,4-二氧代-3,6-二苯基吡咯-[[3,4-c]吡咯（DMDPP）和l，4-二氧代-3,6-二苯基吡咯的旋转弛豫为了确定溶质分子的旋转如何受溶质-溶剂相互作用强度的影响，已经在四种异构体丁醇中研究了[3,4-c]吡咯（DPP）随温度的变化。氢与丁醇的键合反应不影响DMDPP的旋转。另一方面，DPP的旋转受其与溶剂的相互作用的影响，结果发现DPP的重取向时间超过1。比DMDPP长2倍。当通过溶剂粘度对两个探针的重新定向时间进行归一化时，已经获得了两组重新定向时间，一组对应于DMDPP，另一组对应于DPP。四种异构丁醇之间的相互作用强度相同在给定的探针下，这些结果表明丁醇的氢键给体能力的相对差异并未在溶质分子的重新取向时间中体现出来。

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