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首页> 外文期刊>Spectrochimica acta, Part A. Molecular and biomolecular spectroscopy >Spectral investigations of preferential solvation and solute-solvent interactions of 1,4-dimethylamino anthraquinone in CH2Cl2/C2H5OH mixtures
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Spectral investigations of preferential solvation and solute-solvent interactions of 1,4-dimethylamino anthraquinone in CH2Cl2/C2H5OH mixtures

机译：CH2Cl2 / C2H5OH混合物中1,4-二甲基氨基蒽醌优先溶剂化和溶质-溶剂相互作用的光谱研究

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摘要

The optical absorption and IR spectra of 1,4-dimethylamino anthraquinone (1,4-DMAAQ) in CH2Cl2/C2H5OH mixtures have been investigated. The preferential solvation of 1,4-DMAAQ in CH2Cl2/C2H5OH mixed solvents has been studied by monitoring the charge transfer band of 1,4-DMAAQ. The optical absorption spectral study indicates that 1,4-DMAAQ is preferentially solvated by CH2Cl2 in CH2Cl2/C2H5OH mixtures. This can be confirmed by the observed index of preferential solvation value (delta(s1)) as well as higher mole fraction of CH2Cl2 in the solvation microsphere (x(1)(L)) than in the bulk solvent (x(1)). The CH2Cl2 molecules become more available to enter the solvation shell of 1,4-DMAAQ because of the hydrogen bonded clusters formed by ethanol molecules. This is also evident from the non-linear behavior of the transition energy (E-12) as well as the absence of synergistic behavior. IR spectral studies show that the observed shifts in the v(C=O) and v(NH) of 1,4-DMAAQ are due to the dipole-dipole interaction between the 1,4-DMAAQ and the associated ethanol. (C) 2006 Elsevier B.V. All rights reserved.
机译：研究了CH2Cl2 / C2H5OH混合物中1,4-二甲基氨基蒽醌（1,4-DMAAQ）的光吸收和IR光谱。通过监测1,4-DMAAQ的电荷转移带，研究了1,4-DMAAQ在CH2Cl2 / C2H5OH混合溶剂中的优先溶剂化。光学吸收光谱研究表明，在CH2Cl2 / C2H5OH混合物中，CH2Cl2优先溶解了1,4-DMAAQ。这可以通过观察到的优先溶剂化值指数（delta（s1））以及溶剂化微球体（x（1）（L））中CH2Cl2的摩尔分数高于本体溶剂（x（1））中的CH2Cl2摩尔分数来证实。 。由于乙醇分子形成氢键簇，因此CH2Cl2分子更易于进入1,4-DMAAQ的溶剂化壳。从过渡能量（E-12）的非线性行为以及不存在协同行为，这也很明显。红外光谱研究表明，在1,4-DMAAQ的v（C = O）和v（NH）中观察到的位移归因于1,4-DMAAQ与相关乙醇之间的偶极-偶极相互作用。 （C）2006 Elsevier B.V.保留所有权利。

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