Ultraviolet–visible and infrared spectroscopic study of Langmuir–Blogett films of a charge transfer complex based on 2-dodecyl-7,7,8,8-tetracyanoquinodimethane and copper

Majumder, Tapas Pal; Ikegami, Keiichi
June 2002
Journal of Chemical Physics;6/15/2002, Vol. 116 Issue 23, p10428
Academic Journal
Electronic absorption spectra of Langmuir films of 2-dodecyl-7,7,8,8-tetracyano-quinodimethane (C[sub 12]TCNQ) mixed with CuT, prepared on pure water, indicated charge-transfer (CT) reactions in these films. The films could be deposited onto solid substrates as Langmuir-Blogett (LB) films and optically characterized. The CT degree of C[sub 12]TCNQ in these LB films was estimated at - 1 from the red shifts of C...C and C...N stretching modes. The polarized infrared spectra and x-ray diffraction patterns suggested a bimolecular-layer structure for the present films, in contrast to the alkyldicyanoquinonediimine-CuI mixed LB films, for which a monomolecular-layer structure was previously proposed. This distinct difference reflects the effect of the number of cyano groups in acceptor molecules on the structure of LB films based on this kind of transition metal-organic acceptor complexes.


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