发光反应型有机铵分子与CdSe纳米晶的组装

用巯基乙酸做稳定剂制备了水溶性CdSe纳米颗粒, 用十六烷基三甲基溴化铵(HTAB)、发光性(4-甲氧基均二苯乙烯基)二甲基乙基溴化铵 (MODAB)及末端含有双键的(4-甲基丙烯酰氧基均二苯乙烯基)二甲基乙基溴化铵(MSDAB)对该CdSe纳米颗粒进行了混合组装.通过改变三种有机分子的比例可以调控所得组装体的溶解性、聚合性及其发光性质.实验结果表明,当HTAB:MODAB:MSDAB=1:5.98～5.90:0.02～0.10(摩尔比)时,所得组装体具有较好的聚合性、溶解性和荧光性质.

Assembly of Fluorescent and Reactive Organic Ammoniums with CdSe Nanocrystals

A kind of supramolecular assembly with high fluorescence was prepared by reaction of mixed organic ammoniums with mercaptocarboxylic acid stabilized CdSe nanoparticles. The assembly contains double bonds and can polymerize to high polymers with unique structure and properties. Hexadecyltrimethylammonium bromide (HTAB), 4-methoxyl-stilbenyl- dimethylethylammonium bromide (MODAB) and 4-methacryloyloxy trans-stilbenyl- dimethylethylammonium bromide (MSDAB) provide the assembly with oil solubility, fluorescence and polymerizability, respectively. The assembly shows a good balance of these properties when the molar ratio of HTAB:MODAB:MSDAB is 1 : 5.98～5.90 : 0.02～0.10. There was an extraordinary enhancement of the photoluminescent intensity at 495 nm of the assembly and its polymer for the energy transfer from MODAB and MSDAB to CdSe. The solubility of the assembly and its polymer in organic solvent was improved significantly by using mixed organic ammoniums compared with the one using MODAB alone.