Optical characterization of Langmuir-Blodgett films of alkylDCNQI and alkylDCNQI-Cu complexes

To develop a new family of Langmuir-Blodgett (LB) films of charge-transfer (CT) complexes, a long alkyl chain is attached to N,N′-dicyanoquinodiimine (DCNQI). Although no reaction in mixed solutions of the obtained alkylDCNQI and CuI were detected, it has been found that the alkylDCNQI is reduced by CuI when mixed solutions are spread on to the water surface. The optical characterization of LB films of pure alkylDCNQI and those of alkylDCNQI-CuI mixtures indicates the formation of CT complexes in the latter case.