Acta Phys. -Chim. Sin. ›› 2004, Vol. 20 ›› Issue (09): 1067-1070.doi: 10.3866/PKU.WHXB20040902

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Assembly of Fluorescent and Reactive Organic Ammoniums with CdSe Nanocrystals

Liu Ze-Hua;Lai Ren-Fu;Guo Hai-Qing   

  1. College of Chemistry and Molecular Engineering, National Laboratory of Rare Earth Material Chemistry and Application, Peking University, Beijing 100871
  • Received:2004-02-02 Revised:2004-04-02 Published:2004-09-15
  • Contact: Guo Hai-Qing E-mail:guohq@pku.edu.cn

Abstract: 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.

Key words: CdSe, Supramolecular assembly, Fluorescence(FL), Energy transfer