INFRARED AND RESONANCE RAMAN SPECTRA OF DIANION, TRIANION AND NONSTOICHIOMETRIC METAL SALTS OF TCNQ
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Date
1977
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Ohio State University
Abstract
In the vapor composition of alkali metals with TCNQ, the resultant salt is determined by the metal-organic ratio for a particular deposition. As long as the metal-organic ratio does not exceed three, nearly complete charge transfer occurs from the alkali metal atoms to the TCNQ. As a result, it is possible to prepare salts such as $M_{2}{^{+}}TCNQ^{-2}$ and $M_{3}{^{+}}TCNQ^{-3}$ and vibrational data will be presented for them. For metal-organic ratios between one and two the salt deposits contain a mixture of $TCNQ^{-}$ and $TCHQ^{-2}$. The resonance Raman spectrum varies in a consistent and understandable manner if it is presumed that the nonstoichiometric deposits are salt solutions rather than mixtures of polycrystallites of MTCNQ and $M_{2}TCHQ$. In particular, it is observed that one can tune the position of the, salt electronic absorption bands by varying the metal-organic ratio, thereby producing resonant Raman excitation curves analogous to those obtained by tuning the laser excitation frequency.
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Author Institution: Department of Chemistry, Oklahoma State University