Abstract
Recently a new class of conductive Langmuir-Blodgett (LB) films has been generated using M(dmit) 2 ( M = Au or Ni, H 2dmit = 4, 5-dimercapto-1, 3-dithiol-2-thione) as an electron acceptor. One member of this class, the LB film of 3C 10-Au(dmit) 2 (3C 10 = trialkymethylammonium), has after electro-oxidation been reported as the first example of a macroscopically metallic LB film system (σ ≈ 30 S cm −, because of the observed increase in its conductivity with decreasing temperature down to 200 K. Electron spin resonance (ESR) measurements have been performed on LB films of alkylammonium-M(dmit) 2 complexes as well as powder samples. The ESR spectra observed for LB and powder samples are different from each other, suggesting a change in molecular arrangements. ESR spectra are also dependent on the central metal species and the number of alkyl chains. The comparatively low spin density in the electro-oxidized film of 3C 10(dmit) 2 observed at low temperatures suggests a lower amount of disorder and/or a higher degree of dimensionality of the system than for other conductive LB films of charge transfer complexes reported so far.
Published Version
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