Poly（N-trityl serine lactone）（PTSL） and mPEG-block-poly（N-trityl serine lactone）（mPEG-b-PTSL, PEG= polyethylene glycol） were synthesized via the ring-opening polymerization of N-trityl serine lactone（TSL） with diethyl zinc（ZnEt2） as catalyst. The structures of these polymers were confirmed with hydrogen nuclear magnetic resonance（IH NMR） spectroscopy, carbon nuclear magnetic resonance（13C NMR） spectroscopy and infrared（IR） spectrometer. The thermal decomposition temperature and glass transition temperature of PTSL were 241 and 161 ℃, respectively. A series of mPEG-b-PTSL with different molecular weights（Mn＇s from 7000 to 32000） was obtained by tuning the TSL/mPEG feed ratio. After the removal of the trityl groups, mPEG-block-poly（serine lactone）（mPEG- b-PSL） was obtained as a new kind of cationic block copolymer. Low cytotoxicity of these polymers to L929 cells was confirmed via 3-（4,5-dimethylthiazol-2-yl）-2,5-diphenyltetrazolium bromide（MTT） assay.
Aldehyde group-functionalized [Ru（bpy）2L]（PF6）2 catalyst was prepared and immobilized onto the mesoporous silica nanoparticles to act as a heterogeneous catalyst for the selective oxidation of thioanisole to methyl phenyl sulfoxide under visible light.The heterogeneous catalyst can be easily recovered by simple centrifugation without chemical treatment,exhibiting comparable catalytic efficiency with homogeneous ones and no decrease in catalytic efficiency after at least 5 cycles.
HE HongyanLI WenliangXIE ZhigangJING XiabinHUANG Yubin
