Abstract
Authors studied to investigate whether it was possible or not, to extend the spectral sensitivity to the visible region keeping the high sensitivity.
From the result of the calculation of π-electronic state on benzene diazonium cations substituted by the different substituents by Hückel theory, a certain relationship between the charge density of the diazo group in the excited state and the quantum yield was found.
According to this relationship, authors synthesized some diazonium salts having the higher sensitivity than that of the conventional one.
