Thionine sensitized areobic photooxidation of thiourea in acidic medium

作     者：Rafia AZMAT Nida SALEEM 

作者机构：Department of ChemistryJinnah University for WomenKarachi 74600Pakistan 

出 版 物：《中国化学前沿:英文版》 (Frontiers of Chemistry in China)

年 卷 期：2011年第6卷第2期

页      面：120-126页

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070303[理学-有机化学] 0703[理学-化学] 

主　　题：thionine sensitized photo oxidation thiourea singlet oxygen fragment 

摘      要：An investigation of the thionine sensitized aerobic photooxidation of thiourea was observed spectrophotometrically at a wavelength of 598 *** reported two types of reactions which generally occur in the presence of oxygen:1)Singlet oxygen,produced by dye sensitization due to the hydrolysis that reacts with thiourea to form oxidative products like urea and other sulfur-containing fragments and 2)bleaching of dye,which leads to the *** rate of reaction in all studied parameters followed first order kinetics with respect to maximum absorption of the dye in the visible band *** kinetics was significantly dependent upon the medium and the reaction accelerated more rapidly at low pH.A direct relation was exhibited between the thiourea concentration and dye sensitizer,which was not pragmatic with the concentration of *** reaction was effected by the temperature,and the values of energy parameters suggested that the energy of activation was low while the entropy of activation increases with the rise in temperature,which indicated a highly solvated state of intermediate *** value of ΔH* and ΔG*at elevated temperature showed that free energy is the driving force for the completion of reaction.A mechanism based on the above findings has been suggested.