I have been thinking about a material that was made 6 months ago, which is a tetramethylsiloxane linked to a thiazolidinedione and finally to a naphthalene, but I can't find the original paper (if someone can find it please tell me) but that material had a time of duration of 2 hours until the bond of thiazolidinedione to naphthalene is broken and the material is no longer hard but I know it is an isomeration but the bond does not know why it occurred, could someone tell me that defines the time of the bond in molecular switches or is there any related role please?