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The thermal cis-to-trans isomerisation process has been studied for a series of para-, ortho-and polyhydroxy-substituted azobenzenes in different solvents. The kinetics of the thermal back reaction for the p-hydroxy-substituted azobenzenes depend strongly on the nature of the solvent used, with relaxation times ranging from 200-300 milliseconds in ethanol to half an hour in toluene. Otherwise, the process rate is mainly independent of the solvent nature for the ortho substituted analogues.doi:10.1039/c004340k pmid:20820477 fatcat:7a6rtc4mtfaw5e6yjxhvypegxy