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Synthesis of Dendrimer Containing Dialkylated-fluorene Unit as a Core Chromophore via Click Chemistry

  • Han, Seung-Choul (Department of Chemistry and Department of Medical Bioscience, Dong-A University) ;
  • Jin, Sung-Ho (Department of Chemistry Education, Pusan National University) ;
  • Lee, Jae-Wook (Department of Chemistry and Department of Medical Bioscience, Dong-A University)
  • Received : 2011.09.19
  • Accepted : 2011.11.11
  • Published : 2012.01.20

Abstract

The convergent synthetic strategy for the emissive dendrimers having the chromophore at core via the coppercatalyzed 1,3-dipolar cycloaddition reaction between alkyne and azide was described. 2,7-Diazido-9,9-dioctyl-9H-fluorene, designed to serve as the core in dendrimer, was stitched with the alkyne-functionalized Frechettype and PAMAM dendrons by the click chemistry leading to the formation of the corresponding fluorescent dendrimers in high yields. The preliminary photoluminescence studies indicated that 2,7-diazido-9,9-dioctyl-9H-fluorene showed no fluorescence due to the quenching effect from the electron-rich ${\alpha}$-nitrogen of the azido group but the dendrimers fluoresced due to the elimination of the quenching through the formation of the triazole ring.

Keywords

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