The Synthesis And Studies Of Thiazine And Schiff Base Derivatives Properties

Photoisomerization material is a new kind of functional material that has the special photochemistry properties.These materials have extensive potential applications both in biological field and in high technique field,such as biological medicine,photo switches dyes,ophthalinic lenses,optical storage and memory devices,etc.In this thesis,derivatives of thiazine and some Schiff bases compounds were synthesized,and their properties on photoisomerization were studied.First,the synthesis and characterization of the compound 2-Thioxo-1,2-dihydrobenzo[d][1,3]thiazin-4-one(TDBTO) were described.The photoinduced proton transfer reaction,transforming the initially thione form into the thiol form,was found in this molecular and characterized by UV,fluorescence spectra and infrared spectra.Second,the photoisomerization properties of the four derivatives of N, N-dimethylamino-thiosemicarbazones Schiff bases were detailly studied by ~1HNMR spectra,UV-Vis absorption spectra and fluorescence spectra,it was found that these molecules experience cis isomerism to trans isomerism when exposed to UV light and the photoisomeration is somewhat reversible.Third,a novel and simple fluorescence enhancement method for selectively sensing iodide anion was proposed based on metal complex forming between mercuric(â…¡) ion and fluorophore(p-((dimethylamino)benzylidene)thiosemicarbazide, DMABTS) and with anion in aqueous solution.The DMABTS-Hg complex was found to show selectively and sensitively fluorescence enhancement response toward iodide anion.