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首页> 外文期刊>Spectrochimica acta, Part A. Molecular and biomolecular spectroscopy >Dual fluorescence of diphenyl carbazide and benzanilide: Effect of solvents and pH on electronic spectra
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Dual fluorescence of diphenyl carbazide and benzanilide: Effect of solvents and pH on electronic spectra

机译:二苯基卡巴肼和苯甲酰苯胺的双重荧光:溶剂和pH对电子光谱的影响

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The absorption and fluorescence spectra of benzanilide (BA) and diphenyl carbazide (DPC) in solvents of different polarities and pH have been analysed. The spectral characteristics of DPC and BA are compared with diphenyl amine molecule. In water and methanol, a dual fluorescence is observed for both DPC and BA molecules. The normal stokes shifted emission originates from a locally excited pi* electronic state and the large stokes shifted band is due to emission from a twisted intramolecular charge transfer (TICT) state. pH studies show that both monocations and monoanions are non-fluorescent. The excited state acidity constants determined by fluorimetric titration and Forster cycle methods, have been reported and discussed. (c) 2005 Elsevier B.V. All rights reserved.
机译:分析了苯甲酰苯胺(BA)和二苯卡巴肼(DPC)在不同极性和pH值的溶剂中的吸收光谱和荧光光谱。将DPC和BA的光谱特征与二苯胺分子进行了比较。在水和甲醇中,DPC和BA分子均观察到双重荧光。正常的斯托克斯位移发射源于局部激发的π电子态,大的斯托克斯位移能带归因于分子内电荷转移(TICT)状态的发射。 pH研究表明,单阳离子和单阴离子均不含荧光。已经报道和讨论了通过荧光滴定法和Forster循环法测定的激发态酸度常数。 (c)2005 Elsevier B.V.保留所有权利。

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