Preferential Solvation Studies of 1, 5 Diamino Anthraquinone in Binary Liquid Mixtures
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The absorption and fluorescence spectra of 1,5-diaminoanthraquinone(1,5-DAAQ) have been investigated in organic solvents-Benzene(BZ), Ethanol (ETOH), Acetonitrile (AN), Dimethylformamide (DMF) and Dimethyl sulfoxide (DMSO). There is an intra molecular hydrogen bond formed between quinoid oxygen and the substituents NH2 [C = O...H-N]. The interaction of the hydrogen atom of - NH2 leads to red shift in both absorption and fluorescence spectra. The dipole moment ratio of 1,5 DAAQ in ground and excited states was calculated from stokes shift obtained from optical absorption and fluorescence spectra. Photo physical properties of 1,5-DAAQ dye was studied using this absorption and fluorescence spectroscopy techniques in binary liquid mixtures(AN + DMF, AN + DMSO, AN + ETOH and BZ + ETOH).
Keywords1, 5-diaminoanthraquinone Preferential solvation Photo physical properties Absorption and fluorescence spectroscopy Solute solvent interaction
One of the authors (VRK) is thankful to CSIR Government of India for the financial assistance provided in the form of a research project. The authors are thankful to Prof. S. Shamuga Sundaram Department of Micro-bio technology, Madurai Kamaraj University for permitting to make use of the Spectrofluorimeter. UGC, Government of India is gratefully acknowledged for providing the Rajeev Gandhi national fellowship to one of the authors (GS). The authors are grateful to UGC for the financial support extended under DRS Phase III for establishing UV-Visible spectrometer facility.