Solvent effect on photophysical properties and Mg2+ binding of 1,3-diphenyl-propane-1,3-dione
Solvent effect on photophysical properties and Mg2+ binding of 1,3-diphenyl-propane-1,3-dione
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DOI：
10.1016/j.jphotochem.2010.07.017
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发表时间：
2010-09-05
影响因子：
4.3
通讯作者：
Banerjee, Manas
中科院分区：
文献类型：
--
作者：
Chaudhuri, Tandrima;Shukla, Prashant;Banerjee, Manas
本文报道了β-二酮1，3-二苯基-1，3-丙二酮（1 k）在极性、非极性、质子性和非质子性溶剂中的吸收和发射光谱。在众多的溶剂中，然后通过多元线性回归，其中几个溶剂参数同时分析的光谱带的溶剂化变色位移进行了研究。这种π-共辄β-二酮表现出溶剂化变色性。研究了高氯酸镁溶液中1 k的电子吸收和发射光谱特性的变化。吸收光谱研究表明，镁离子和1 k之间的络合物形成在基态。确定了双酮-阳离子1：1相互作用的平衡常数、络合物形成的焓和熵以及吸收物种的摩尔吸光度。随着Mg（ClO 4）（2）的加入，荧光光谱发生了变化，表明1 k的氢键激发态的存在。在丙酮和甲醇介质中测定了1 K/Mg ~（2+）相互作用的平衡常数。(C)2010爱思唯尔有限公司版权所有。
The absorption and emission spectroscopic investigations of a beta-diketone, 1,3-diphenyl-propane-1,3-dione (1k) in various polar, non-polar as well as protic and aprotic solvents are reported. The solvatochromic shifts of the spectral bands were studied in a multitude of solvents followed by multi-linear regression in which several solvent parameters were simultaneously analysed. This pi-conjugated beta-diketone exhibits solvatochromism. Variation in the electronic absorption and emission spectral characteristics of 1k were studied in solution in presence of magnesium perchlorate. Absorption spectral studies indicate complex formation between magnesium ion and 1k in the ground state. The values of equilibrium constant, enthalpy and entropy of complex formation together with the molar absorbance of the absorbing species have been determined for the diketone-cation 1:1 interaction. Fluorescence spectral changes with the addition of Mg(ClO4)(2) revealed the existence of hydrogen bonded excited state of 1k. The values of equilibrium constant for 1k/Mg2+ interaction have been measured in acetone and methanol media. (C) 2010 Elsevier B.V. All rights reserved.