Fluorescence spectroscopic investigation of the interaction between triphenyltin and humic acids.
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.
Jiangsu Provincial Key Laboratory of Coastal Wetland Bioresources and Invironmental Protection, Yancheng City, Jiangsu Province, People's Republic of China. hxzhm@126.com
Hong-Mei
HM
Zhang
Qiu-Hua
QH
Zhou
Mei-Gui
MG
Xue
Yan-Qing
YQ
Wang
D000890:Anti-Infective Agents / Q000737:chemistry; D006812:Humic Substances; D009947:Organotin Compounds / Q000737:chemistry*; D013050:Spectrometry, Fluorescence / Q000379:methods*; D013816:Thermodynamics
D000890:Anti-Infective Agents; D006812:Humic Substances; D009947:Organotin Compounds; C030665:triphenyltin