PORPHYRIN FUNCTIONALIZING OF 4-VINYLPYRIDINE POLYMERS VIA AXIAL COORDINATION REACTION
通过轴向配位反应实现4-乙烯基吡啶聚合物的卟啉功能化

Zinc tetraphenylporphyrin (ZnTPP) was bound on the side chains of the copolymers of 4-vinylpyridine and styrene (P(4VP-co-St)) via axial coordination reaction,and the porphyrin-functionalized polymer ZnTPP-P(4VP-co-St) was prepared.The structures of ZnTPP-P(4VP-co-St) were characterized with FTIR and 1H-NMR spectra.The effects of time and temperature on the bonding degree of ZnTPP on P(4VP-co-St) were analyzed.Moreover,the electronic absorption and fluorescence emission spectra of ZnTPP-P(4VP-co-St) were mainly studied,and its photo-physical behaviors were described in depth.The experimental results show that the porphyrin-functionalized macromolecules ZnTPP-P(4VP-co-St) can be favorably prepared through the axial coordination reaction between the side pyridine groups of the copolymer P(4VP-co-St) and the metalloporphyrin ZnTPP,and the lower the temperature,the higher the bonding degree of ZnTPP is.The macromolecular axial coordination compound ZnTPP-P(4VP-co-St) possesses the characteristic electronic absorption and fluorescence emission spectra of ZnTPP,and at the same time,it exhibits the characters of axial coordination compounds.As compared with the small molecular ZnTPP,all of the absorption and emission spectra of ZnTPP-P(4VP-co-St) exhibit obvious red shift.In addition,the behavior of the axial coordination compound ZnTPP-P(4VP-co-St) exhibits a polymer effect in its photophysical behavior.As the bound amount of ZnTPP on the side chain of polymer P(4VP-co-St) is increased,the energy transfer between the adjacent side ZnTPP units will be produced,resulting in the slight weakening of the fluorescence emission.