Abstract
AbstractRectification, i.e. asymmetrical electrical conduction by a Langmuir‐Blodgett monolayer of dicyano{4‐[1‐cyano‐2‐(1‐hexadecylquinolin‐1‐ium‐4‐yl)vinyl]phenyl} methanide (1), occurs between both Al and Au electrodes: this rectification arises from the asymmetry of the molecule, and the interplay between the zwitterionic ground state D+‐π‐A− and the less dissociated first electronic excited state D0‐π‐A0. Two more monolayer rectifiers have been found: 1‐butyl‐2,6‐bis{2‐[4‐(dibutylamino)phenyl] vinyl}pyridin‐1‐ium iodide (2) is an interionic rectifier with back charge transfer between the iodide ion and the pyridinium ring. 1a‐[4‐(dimethylamino)phenyl]‐1aH‐1a‐aza‐1(2)a‐homo(C60‐Ih)[5,6]fullerene (3) is a moderate rectifier, with a rectification ratio of 2.
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