Optical and electron-energy-loss studies of the monomeric and dimeric phases of decamethylferrocenium tetracyanoquinodimethanide, (DMeFc)(TCNQ)

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Publication Type Journal Article
School or College College of Science
Department Chemistry
Creator Miller, Joel Steven
Other Author Tanner, D. B.; Rice, M. J.; Ritsko, J. J.
Title Optical and electron-energy-loss studies of the monomeric and dimeric phases of decamethylferrocenium tetracyanoquinodimethanide, (DMeFc)(TCNQ)
Date 1980
Description The optical properties of the two crystallographic phases of 1:l decaniethylferrocenium tetracyanoauinodimethanide, (DMeFc)(TCNQ), have been measured from 0.1 to 10 eV. One phase consists of isolated paramagnetic TCNQ anion monomers while the other contains isolated diamagnetic dimers. The spectrum of the monomeric phase exhibits a strong localized monomer exciton which is not normally observed in solid TCNQ salts, while the dimeric phase shows a charge-transfer excitation as well as a shifted local exciton. From the frequency- dependent conductivity of the dimeric phase the effective on-site Coulomb interaction and the transfer matrix element are measured to be 1.0 and 0.27 eV, respectively. The infrared absorption spectrum of the dimeric phase shows an unusual activity of the symmetric phonon modes due to the interaction of these modes with the radical electron, whereas in the monomeric phase only normally infrared active phonons are observed. In electron-energy-loss measurements an anomalous momentum dependence of the line shape of the monomeric exciton was observed. This result is attributed to a dielectric effect caused by the decrease in strength of local excitons with increasing momentum.
Type Text
Publisher American Physical Society
Volume 21
Issue 12
First Page 5835
Last Page 5845
Subject Ions; Spectrum
Language eng
Bibliographic Citation Tanner, D. B., Rice, M. J., & Ritsko, J. J.(1980). Optical and electron-energy-loss studies of the monomeric and dimeric phases of decamethylferrocenium tetracyanoquinodimethanide, (DMeFc)(TCNQ). Physical Review B, 21(12), 5835-45.
Rights Management (c) American Physical Society
Format Medium application/pdf
Format Extent 1,383,931 bytes
Identifier ir-main,5380
ARK ark:/87278/s6w38dhb
Setname ir_uspace
Date Created 2012-06-13
Date Modified 2012-06-13
ID 703605
Reference URL https://collections.lib.utah.edu/ark:/87278/s6w38dhb
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