Синтез и комплексообразование краунсодержащего полигетероциклического производного - мультипараметрического сенсора на катионы металлов

Molecular sensors became very popular among the researchers in these latter days due to the possibility to use them for development of new effective methods in the fields of biochemical analysis and environmental monitoring. Polythiophene derivatives, containing ionophoric residues, demonstrate changes in electrochemical characteristics during the complexation with different metal cations. Also some polythiophene derivatives demonstrating an optical response upon the complex formation with alkaline and alkaline-earth metals are known from the literature. Only a couple of polythiophene derivatives that can be considered as multiparametric sensors are known. The presence of thiophene chain in the ligand molecule allows detection of metal cations using optical as well as electrochemical methods. In the present report the synthesis and investigations of crown-containing polythiophene derivative possessing optical and electrochemical characteristics as well as ability toward complex formation with alkaline-earth metals are given. The novel ligand has an extended chromophoric system with a donor crown ether part at one end and acceptor benzothiazol residue at the other end. This kind of structure provides good optical characteristics in UV-Vis spectral range. The long-wavelength band in the absorption spectrum of donor-acceptor type compound is caused by charge transfer from donor to acceptor part at photoexcitation. Two thiophenic rings are introduced into the ligand to provide