期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 9, 期 20, 页码 4878-4886出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.200304947
关键词
diarylethene; photochromism; hydrogen bonding; X-ray analysis
Photochromic diarylethenes, which bear carboxyl groups at the ortho, meta, or para positions of both terminal phenyl groups, have been synthesized. The diarylethenes adopt linear chain structures as a result of hydrogen bonding in the crystalline phase, and the crystals exhibit photochromic properties. The absorption maximum of the photogenerated closed-ring isomer of the para-substituted derivative shows an 80 nm bathochromic shift in comparison with that of the ortho-substituted derivative. The maximum of the closed-ring isomer of the meta-substituted derivative is located in between those of the para- and ortho-substituted derivatives. The shifts can be attributed to the differences in conformation among the derivatives, arising from the restrictions imposed by the hydrogen-bonded chains.
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