Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Photoresponsive Arylether Dendrimers with Azobenzene Core and Terminal Vinyl Groups

  • Lee, Ji-Hye (Department of Chemistry, Sunchon National University) ;
  • Choi, Dae-Ock (Department of Chemistry, Sunchon National University) ;
  • Park, Ji-Eun (Department of Chemistry, Sunchon National University) ;
  • Shin, Eun-Ju (Department of Chemistry, Sunchon National University)
  • Published : 2008.04.20
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Abstract

Photoresponsive arylether dendrimers Bis-azo-Gn(3,5) 1a-1c and Bis-azo-Gn(3,4,5) 2a-2c (n = 1-3) with an azobenzene unit at the core and several vinyl groups (3,5-bis(but-3-enyloxy)phenyl groups or 3,4,5-tris(but-3- enyloxy)phenyl groups) at the periphery have been prepared. Their structures and reversible trans-cis isomerization behaviors have been investigated by $^1H$-NMR, $^{13}C$-NMR, MALDI-TOF-Mass, and UV-vis spectra. All six azobenzene-cored dendrimers carried out very fast trans $\rightarrow$ cis photoisomerization on irradiation of 350 nm light and reached to the photostationary state within 180 s. During the dark incubation, slow thermal back reversion from cis to trans form is observed for all six dendrimers and is completed within 3 days for 1a-1c and 1 day for 2a-2c. Isomerization efficiency decreases with increasing generation. However, the initial reaction rates of both trans $\rightarrow$ cis photochemical isomerization and cis $\rightarrow$ trans thermal isomerization increases significantly with increasing generation for dendrimers for 1a-1c but only slightly for 2a-2c.

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