A new family of Langmuir–Blodgett films of tetracyanoquinodimethane charge transfer salts: Pristine and iodine doped conducting films

A new family of semiamphiphilic tetracyanoquinodimethane (TCNQ) ionic salts of nonconjugated cations, namely octadecyl‐dimethylsulfonium, octadecyl‐methyl‐ethyl‐sulfonium, and octadecyl‐trimethylphosphonium labeled a, b, and c, respectively, has been synthetized. Langmuir–Blodgett (LB) films are built up from these three compounds, which are mixed with octadecylurea in a molar ratio 1/1, in order to improve the stability of the film at the water surface. The structural properties of the transferred films are thoroughly investigated by linear dichroism in the IR and UV–visible ranges, together with ESR spectroscopy. In the films of the three compounds, the polar sheets contain (TCNQ− • )2 dimers, which are the largely prevalent species. The molecular planes of these dimers are found to be roughly parallel to the substrate. Moreover, a strong in‐plane orientation of the dimers is found in films of compound c. This phenomenon is thought to be related to an overall flow orientation of rod‐shaped crystallites ...

[1]  P. Lesieur,et al.  Structural properties of Langmuir-Blodgett films of charge transfer salts: Pristine and iodine doped conducting films of (N-docosyl-pyridinium)TCNQ , 1987 .

[2]  P. Lesieur,et al.  A novel highly conducting tetracyanoquinodimethane (TCNQ) Langmuir–Blodgett film , 1987 .

[3]  P. Lesieur,et al.  Electronic transport properties in conducting Langmuir-Blodgett films , 1986 .

[4]  Shin-ichi Kuroda,et al.  Direct observation of in-plane molecular alignment in LB films of a merocyanine dye using ESR spectroscopy , 1986 .

[5]  M. Vandevyver,et al.  Couches de Langmuir-Blodgett conductrices obtenues à partir d'un sel complexe de TCNQ , 1986 .

[6]  P. Lesieur,et al.  Structure and properties of an n-docosylpyridinium-tetracyanoquinodimethane salt in Langmuir-Blodgett multilayers , 1985 .

[7]  A. Barraud,et al.  Novel Conducting LB Films , 1985 .

[8]  C. S. Jacobsen,et al.  Organic conductors: evidence for correlation effects in infrared properties , 1984 .

[9]  P. Maillard,et al.  Structure of porphyrin multilayers obtained by the Langmuir Blodgett technique , 1982 .

[10]  T. Ohta,et al.  Low-temperature Reflection Spectra of the Single Crystals of TCNQ Complex Salts , 1981 .

[11]  R. Bozio,et al.  Intramolecular phase phonon absorptions as probes of the donor and acceptor chain contributions to the phase transitions of TTF-TCNQ , 1981 .

[12]  A. Ruaudel-Teixier,et al.  Energy transfer in dye monomolecular layers , 1980 .

[13]  L. Alcácer.  Highly Anisotropic Solids. (Book Reviews: The Physics and Chemistry of Low Dimensional Solids) , 1980 .

[14]  J. Torrance.  The difference between metallic and insulating salts of tetracyanoquinodimethone (TCNQ): how to design an organic metal , 1979 .

[15]  J. Hubbard,et al.  Generalized Wigner lattices in one dimension and some applications to tetracyanoquinodimethane (TCNQ) salts , 1978 .

[16]  A. Girlando,et al.  Influence of the intermolecular charge transfer interaction on the solution and solid state infrared spectra of 7,7,8,8-tetracyanoquinodimethane (TCNQ) alkaline salts , 1978 .

[17]  Y. Koyama,et al.  The relation between the crystal axes and the dipping direction of built-up films of octadecanoic acid as revealed by polarized infrared transmission spectroscopy , 1977 .

[18]  G. Gaines,et al.  Insoluble Monolayers at Liquid-gas Interfaces , 1966 .

[19]  W. D. Phillips,et al.  Solution Dimerization of the Tetracyanoquinodimethane Ion Radical , 1965 .

[20]  K. B. Blodgett.  Films Built by Depositing Successive Monomolecular Layers on a Solid Surface , 1935 .