Optical properties of quinolinium tetracyanoquinodimethanide, [Qn(TCNQ)2] and (N-methylphenazinium)x(phenazine)1-x (tetracyanoquinodimethane) [(NMP)x(Phen)1-x(TCNQ)]

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Publication Type Journal Article
School or College College of Science
Department Chemistry
Creator Miller, Joel Steven; Epstein, Arthur J.
Other Author McCall, R. P.; Hamberg, Ivar.; Tanner, D. B.
Title Optical properties of quinolinium tetracyanoquinodimethanide, [Qn(TCNQ)2] and (N-methylphenazinium)x(phenazine)1-x (tetracyanoquinodimethane) [(NMP)x(Phen)1-x(TCNQ)]
Date 1989
Description We present here optical-absorption data of quinolinium ditetracyanoquinodimethanide [Qn(TCNQ)2] and (N-methylphenazinium)x(phenazine)1-x(tetracyanoquinodimethanide) [(NMP)x(Phen)1-x(TCNQ)] for 0.5 <_x<_ 0.6. These materials span the range of electronic structure from commensurate, to commensurate with confined soliton-antisoliton pairs (bipolarons), to incommensurate. The data show that these materials are semiconductors up to 300 K. The semiconducting gap, due mostly to a Peierls distortion, is weakly temperature dependent, decaying slowly as the temperature increases. This behavior, determined by the observation of the totally symmetric a, vibrational modes of the TCNQ molecule, is similar for all compositions studied and is suggested to be due to the effects of an external cation potential or to Coulomb effects, which vary little with composition. Substantial in-gap absorption is observed and is suggested to be due to the presence of quantum-nucleated and thermally generated bipolarons. The variation of higher-energy electronic transitions with composition corresponds to a crossover from commensurate to incommensurate electronic structure.
Type Text
Publisher American Physical Society
Volume 39
Issue 11
First Page 7760
Last Page 7769
Subject Commensurate; Lattice; Electron
Language eng
Bibliographic Citation McCall, R. P., Hamberg, I., Tanner, D. B., Miller, J. S., & Epstein, A. J. (1989). Optical properties of quinolinium tetracyanoquinodimethanide, [Qn(TCNQ)2] and (N-methylphenazinium)x(phenazine)1-x (tetracyanoquinodimethane) [(NMP)x(Phen)1-x(TCNQ)]. Phycial Review B, 39(11), 7760-7769.
Rights Management (c) American Physical Society
Format Medium application/pdf
Format Extent 1,596,205 bytes
Identifier ir-main,5267
ARK ark:/87278/s6891q22
Setname ir_uspace
Date Created 2012-06-13
Date Modified 2012-06-13
ID 703429
Reference URL https://collections.lib.utah.edu/ark:/87278/s6891q22