Langmuir–Blodgett (LB) films of mixtures of 3,4,9,10-perylenetetracarboxylic diimide (PTCDI), merocyanine dye (DO) and arachidic acid(C20) with different molecular ratios, were prepared on Cd2+-containing and pure-water subphases. The characterization of mixed Langmuir and LB films were performed by using, respectively, surface pressure-molecular area isothermetry and UV-Vis-IR absorption spectroscopy. The analysis indicates that interaction between the two dyes modifies their arrangements and electronic states in their mixed Langmuir films spread upon the Cd2+-containing subphase. However, the mixed LB films with the pure-water subphase are showed to be simple physical mixtures. The difference in the mixing effect observed for the Langmuir films upon the Cd-containing and pure-water subphases may be caused by the formation of metal chelation with the former subphase.

LB films of organic-inorganic charge-transfer systems, Cu-complexes of 2-methyl-5-octadecyIDCNQI(C18MeDCNQI) and 2-alkylTCNQ(CnTCNQ with n=12,15 and 18), were successfully fabricated by utillizing the airwater interface as a reaction field for the reduction of the acceptor moieties. The charge transfer degrees of the C18MeDCNQI and CnTCNQ in the LB films were estimated at -1, respectively, from the changes in their IR absorption spectra upon the reduction. The molecular orientation in the films were discussed on the basis of polarized IR spectroscopy. It is suggested that the molecular orientation in the present LB films is largely affected by the coordinate bonds between the Cu cations and the cyanic groups.

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 alkylDCNQ1 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.

The photoelectric conversion of a novel Langmuir-Blodgett (LB) jilm consisting of 3.4.9.10-perylenetetracarboxylic diimides (PTCDI) and amphiphilic zinc phthalocyanine (AmZnPc) were investigated. The results show that the PTCDI molecules were embedded in the cavity between the long alkyl chains of AmZnPc in the monomolecular layer of LB film. The Voc of the monomolecular layer of a mixture of PTCDI (E) and AmZnPc was as high as 145 mV. Copyright

This article reports the photoelectric conversion of 3, 4, 9, lO-perylenetetracarboxylic diimides (PTCDI) in multilayers of Langmuir-Blodgett (L-B) films using the photoelectrochemistry technique and absorption spectroscopy. The rate of electron transfer caused by five different PTCDI molecules was determined and the results demonstrate the photoelectric conversion properties of PTCDI molecules in L-B films.