Thionine sensitized areobic photooxidation of thiourea in acidic medium  

作　　者：Rafia AZMAT Nida SALEEM 

机构地区：[1]Department of Chemistry,Jinnah University for Women,Karachi 74600,Pakistan

出　　处：《Frontiers of Chemistry in China》2011年第2期120-126,共7页中国化学前沿（英文版）

摘　　要：An investigation of the thionine sensitized aerobic photooxidation of thiourea was observed spectrophotometrically at a wavelength of 598 nm.Articles 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 reduction.The rate of reaction in all studied parameters followed first order kinetics with respect to maximum absorption of the dye in the visible band region.Reaction 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 dye.The 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 complex.Lower 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.

关 键 词：thionine sensitized photo oxidation THIOUREA singlet oxygen FRAGMENT 

分 类 号：O62[理学—有机化学]