Lewis acid enhanced switching of the 1,1-dicyanodihydroazulene/ vinylheptafulvene photo/thermoswitch

摘要

Mild Lewis acids enhance the rate of the thermal conversion of vinylheptafulvene (VHF) to dihydroazulene (DHA). In the absence of light, stronger Lewis acids promote the otherwise photoinduced DHA to VHF conversion.rnPhotoswitches have been used extensively for controlling the state of supramolecular systems and assemblies by means of light.1 The most prevalent of these have been the azobenzenes and dithienylethenes, which can be interconverted between their two states by light of different wavelengths. Another system that.