Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 2011-03-01

Fluorescence spectroscopic investigation of the interaction between triphenyltin and humic acids.

Hong-Mei Zhang, Qiu-Hua Zhou, Mei-Gui Xue, Yan-Qing Wang

Index: Spectrochim. Acta. A. Mol. Biomol. Spectrosc. 78(3) , 1018-22, (2011)

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Abstract

The interaction between triphenyltin (TPT) and humic acid (HA) was investigated using UV-vis and fluorescence spectra techniques. The experimental results showed that the fluorescence quenching of HA by TPT was a result of the interaction of TPT with HA. The binding constant K(b) and corresponding thermodynamic parameters were measured at different temperatures. The binding of TPT molecule to HA is a spontaneous molecular interaction procedure in which entropy increased and Gibbs free energy decreased. Hydrophobic interaction force plays a major role in stabilizing the TPT-HA complex. The three-dimensional fluorescence contour spectra revealed that TPT could enter into the hydrophobic cavities in some domain of HA.Copyright © 2010 Elsevier B.V. All rights reserved.