Infrared absorption and reflection studies of organic radical salt: K +TCNQ-

Zafar Iqbal, C. W. Christoe, D. K. Dawson

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


The bulk reflectivity and absorption (using alkali halide matrices and thin film dispersions) of polycrystalline K+TCNQ- in the wavelength range between 30 and 4000 cm-1 have been examined in detail. The sharp reflectivity peaks have been analyzed using a classical oscillator fitting procedure to give the peak and oscillator parameters. Most of the observed infrared peaks have been assigned to the fundamental modes of TCNQ- and lattice vibrations. The temperature dependence of the CN stretching peaks in particular have been studied in the 300-433°K temperature range. The reversible and gradual disappearance of one set of CN stretching peaks in K+TCNQ- has been tentatively linked to a possible cell halving phase transition at Tc∼379°K. The results are compared with the spectrum of Rb+TCNQ- which is isomorphous with the postulated high temperature phase of K +TCNQ-.

Original languageEnglish (US)
Pages (from-to)4485-4489
Number of pages5
JournalThe Journal of Chemical Physics
Issue number10
StatePublished - 1975
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry


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