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Photochromic Spiropyran Dendrimers: ‘Click’ Syntheses, Characterization, and Optical Properties
Author(s) -
Zhang Qiong,
Ning Zhijun,
Yan Yongli,
Qian Shixiong,
Tian He
Publication year - 2008
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200700703
Subject(s) - photochromism , spiropyran , dendrimer , monomer , click chemistry , polymer chemistry , materials science , absorption (acoustics) , photochemistry , methyl methacrylate , chemistry , polymer , composite material
Resorting to ‘click chemistry’, four photochromic dendrimers, A‐Tri‐SP, B‐Tri‐SP, C‐Tri‐SP, and D‐Hex‐SP, have been synthesized facilely in sound yields of 85, 88, 94, and 80%, respectively. These dendrimers have been obtained by the straightforward coupling of azido‐attached photochromic spiropyran units to acetylenic‐terminated dendritic cores. The photochromic dendrimers show typical photochromic properties both in tetrahydrofuran solution and in poly(methyl methacrylate) film. They are demonstrated to be endowed with superior performance in comparison to the corresponding spiropyran monomer in terms of larger optical density, better stability of the open ring form, higher sensitivity towards the coordination of ferric ions, and better two‐photon absorption properties.