Two oxygen sensors based on the fluorescence quenching of pyrene bonding on side-chain polysiloxanes

摘要

The two novel side-chain polysiloxanes containing different pyrene groups (-COO- and -OOC-) were synthesized by the hydrosilylation of polymethylhydrogensiloxane (PMHS) respectively with two pyrene derivatives, 1-decenyl-4-(1-pyrenyl) butanoate (DCPB) and 4-(1-pyrenyl) butyl-9-decenoate (PBDE). The polymers structures were confirmed by FTIR and ~1HNMR. The photophysical properties of the monomers and polymers in toluene were studied by using Hitachi F-2500 Fluorescence Spectrometer. It was found that the spectrum of the polymer was different from that of its monomer. The fluorescence intensity and the oxygen queching sensity (OQS) of the polymers are due to the side-chain construction. The OQS of the polymer with -COO- groups was as high as 59% at the monomer emission (ME) and 54% at the excimer emission (EE). With -OOC- groups, it was about 37% at ME and 56% at EE. It was found that the side-chain polysiloxane with -COO- groups was higher oxygen quenching performance than that with -OOC- groups. With the decreasing of the concentration, the changes of fluorescence intensity and OQS were both increasing at ME and decreasing at EE.