cis–trans Reversible Photoisomerization of an Amphiphilic Azobenzene Derivative in Its Pure LB Film Prepared as Polyion Complexes with Polyallylamine

Abstract

Abstract By using polyallylamine (PAA) for the aqueous subphase, the pure LB films of an azobenzene derivative with a long alkyl-chain showed reversible cis–trans photoisomerization due to the relatively large cross section of the molecule determined by the surface density of the ammonium cations of protonated PAA.