Synthesis and characterisation of polymerisable photochromic spiropyrans: towards photomechanical biomaterials
摘要:
A methodology for the synthesis of novel polymerisable spiropyrans with photomechanical properties suitable for subsequent copolymerisation with either vinyl or acrylate-based biomaterials is described. UV-vis spectroscopic characterisation of photoisomerism shows that photochromic behaviour with respect to related non-polymerisable compounds is retained and is solvent dependent. In acetone, conventional spiropyran-merocyanine photochromism is observed for nitro-spiropyran derivatives, whereas in dichloromethane both nitro-spiropyrans and spiropyrans isomerise to merocyanines which rapidly form H-aggregates. The monomers were designed such that an alkyl spacer of variable length, both electronically and sterically, separates the polymerisable moiety from the photochromic core and allows steric aspects of the resulting photomechanical behaviour to be explored. (c) 2006 Elsevier Ltd. All rights reserved.
Reversibly Switchable Surfactants and Methods of Use
申请人:WARNER BABCOCK INSTITUTE FOR GREEN CHEMISTRY, LLC
公开号:US20190152993A1
公开(公告)日:2019-05-23
Disclosed herein are reversibly-switchable surfactants and methods of extracting natural products, coating surfaces, cleaning laundry, and osmotic extraction using same.
Synthesis and characterisation of polymerisable photochromic spiropyrans: towards photomechanical biomaterials
作者:Colin P. McCoy、Louise Donnelly、David S. Jones、Sean P. Gorman
DOI:10.1016/j.tetlet.2006.11.110
日期:2007.1
A methodology for the synthesis of novel polymerisable spiropyrans with photomechanical properties suitable for subsequent copolymerisation with either vinyl or acrylate-based biomaterials is described. UV-vis spectroscopic characterisation of photoisomerism shows that photochromic behaviour with respect to related non-polymerisable compounds is retained and is solvent dependent. In acetone, conventional spiropyran-merocyanine photochromism is observed for nitro-spiropyran derivatives, whereas in dichloromethane both nitro-spiropyrans and spiropyrans isomerise to merocyanines which rapidly form H-aggregates. The monomers were designed such that an alkyl spacer of variable length, both electronically and sterically, separates the polymerisable moiety from the photochromic core and allows steric aspects of the resulting photomechanical behaviour to be explored. (c) 2006 Elsevier Ltd. All rights reserved.