Synthesis and photochromic properties of a bis(diarylethene)-naphthopyran hybrid
Synthesis and photochromic properties of a bis(diarylethene)-naphthopyran hybrid
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DOI：
10.1016/j.dyepig.2014.12.015
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发表时间：
2015-04
影响因子：
4.5
通讯作者：
Firealem G. Erko;L. Cseh;J. Berthet;G. Mehl;S. Delbaere
中科院分区：
文献类型：
--
作者：
Firealem G. Erko;L. Cseh;J. Berthet;G. Mehl;S. Delbaere
报道了一种由一个萘并吡喃和两个二芳基乙烯单元组成的三光致变色分子的合成及其光致变色性能。六种不同的状态，从开放/封闭的萘并吡喃与一个或两个开放/环化的二芳基乙烯已被表征。随后的三光致变色目标的六个状态之间的光化学和热相互转换，允许确定现有的途径后，用313和365 nm的光激发照射，并在热演化。萘并吡喃基团的转换是可能的，与二芳基乙烯基团的状态无关。然而，如果萘并吡喃基团是开放的，则二芳基乙烯基团不能是闭合的。
The synthesis and photochromic properties of a triphotochromic molecule consisting of one naphthopyran flanked by two diarylethene units investigated by UV–Visible and Nuclear Magnetic Resonance spectroscopies are reported. Six different states resulting from the open/closed naphthopyran associated with one or two open/cyclized diarylethenes have been characterized. The photochemical and thermal interconversion between the six states of the triphotochromic target was followed allowing to determine the existing pathways upon irradiation with 313 and 365 nm light excitation, and during thermal evolution. Switching of the naphthopyran group is possible, independently of the state of the diarylethene groups. However, the diarylethene groups cannot be closed if the naphthopyran group is open.