The optical properties of pyridyl-substituted dihydroazulene (DHA) photoswitches can be tuned by protonation/deprotonation as well as the thermal back-reaction rate and amount of heat release from the vinylheptafulvene (VHF) photoisomers.
Tetra(4-aminophenyl)ethene shows three paths of π-conjugation, linear-cis, linear-trans and a cross-conjugation, of which only the linear and the cross configurations are able to show conductance in molecular junctions.
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