Langmuir-Blodgett films containing TCNQ incorporated from the aqueous subphase

Films containing TCNQ (tetracyanoquinodimethane) anions were prepared by in corporating it from a LiTCNQ aqueous subphase. The TCNQ moiety was transfer red from the subphase as the counterion of a positively charged monolayer o f DPOP+ (diphenyl-bis(octadecylamino)phosphonium). The isotherm shape, the area per molecule, the collapse pressure, and the monolayer stability were dependent on the LiTCNQ concentration in the subphase. The obtained Langmui r-Blodgett films were classified into three types depending on the TCNQ oxi dation state. The oxidation state depends on the transference pressure as w ell as on the monolayer age. The degree of both order and architecture of t he films was studied by means of SEM, IR, UV-vis spectroscopy, and X-ray di ffraction. Conductivity studies were also performed. (C) 2001 Academic Pres s.