Vibrational spectra of two new organic semiconductors: tetrathiafulvalene (TTF) and tetramethyltetraselenafulvalene (TMTSF) salts of paranitrophenylmalononitrile (PNMA)

Truong, K. D.; Bandrauk, A. D.; Zauhar, J.; Carlose, C.

doi:10.1139/v91-132

Cited by 4 publications

(1 citation statement)

References 16 publications

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“…The increase in complexity of the IR active Ag mode spectrum also correlates strongly with this picture. In particular, the increase in oscillator force of these vibrations is now explainable as an increase in electron-vibration coupling in the tetramer (21). Furthermore, the C=N vibrations show the greatest spectral change in crossing the phase transition (Figs.…”

Section: This Expression Requires the Detection Of All The Infrared Amentioning

confidence: 97%

A study of the phase transition in semiconducting 1:2 tetracyanoquinodimethane charge transfer complexes with dipropylamine derivatives: X-ray structure and polarized reflection spectra

Truong¹,

Pépin²,

Bandrauk³

et al. 1991

Can. J. Chem.

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Chem. 69, 1804 (1991).The donors dipropylamine (DPA), methyldipropylamine (MDPA), and ethyldipropylamine (EDPA) from 1:2 charge transfer complexes with the acceptor tetracyanoquinodimethane (TCNQ). All crystals in the above series are semiconductors and undergo a first-order phase transition at the temperature around 210 K as obtained from conductivity measurements. The X-ray structure of DPA-(TCNQ)? was obtained as a function of temperature, and shows a distinct order-disorder transition in the hydrogen-bond network between donors and acceptors. Polarized reflection spectra on single crystals of these compounds were measured as a function of temperature in the frequency range from 400 to 4000 crn-'. A detailed study of the e N modes of TCNQ indicates this mode is strongly influenced by the transition due to it being hydrogen bonded to the donors. The reflection coefficients of the IR active Ag modes of TCNQ also undergo a sharp discontinuity at the transition temperature. These results are interpreted as due to a cooperative order-disorder and electronic spin -Peierls transition.Key words: organic semiconductors, X-ray structure, polarized reflection spectra, phase transition, cooperative orderdisorder transition, spin-Peierls transition. La dipropylamine (DPA), la mCthyldipropylamine (MDPA) et l'ithyldipropylamine (EDPA) agissent comme donneurs pour former des complexes de transfert de charge 1 : 2 avec le titracyanoquinornithane (TCNQ) qui agit comme accepteur. Tous les cristaux des series sus-mentionnies sont des semi-conducteurs et, d'aprks les mesures de conductiviti, ils subissent une transition de phase du premier ordre B une tempirature d'environ 210 K. Faisant appel B la diffraction des rayons-X, on a dCterminC la structure du complexe DPA-(TCNQ)? en fonction de la tempirature; on observe une transition distincte ordreldCsordre dans le riseau des liaisons hydrogknes entre donneurs et accepteurs. On a mesuri le spectre de riflexion polarisie de cristaux uniques en fonction de la tempirature entre 400 et 4000 cm-' . Une Ctude dttaillCe des modes C=N du TCNQ indique que ce mode est fortement influencC par la transition; cet effet est dfi au fait que cette liaison est impliquie dans une liaison hydrogkne avec les donneurs. Les coefficients de riflexion des modes Ag du TCNQ actifs en infrarouge subissent aussi une discontinuiti importante au niveau de la temperature de transition. On interprkte ces risultats en fonction d'une transition coopirative ordreldksordre et spin ClectroniquelPeierls.

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Section: This Expression Requires the Detection Of All The Infrared Amentioning

confidence: 97%

A study of the phase transition in semiconducting 1:2 tetracyanoquinodimethane charge transfer complexes with dipropylamine derivatives: X-ray structure and polarized reflection spectra

Truong¹,

Pépin²,

Bandrauk³

et al. 1991

Can. J. Chem.

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Spectroscopic investigation of some building blocks of organic conductors: A comparative study

Mukherjee

Yadav

2017

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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Raman and microwave surface impedance measurements in the organic superconductor κ-Et2Cu[N(CN)2]BrxCl1−x

et al. 1997

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Vibrational spectra of two new organic semiconductors: tetrathiafulvalene (TTF) and tetramethyltetraselenafulvalene (TMTSF) salts of paranitrophenylmalononitrile (PNMA)

Cited by 4 publications

References 16 publications

A study of the phase transition in semiconducting 1:2 tetracyanoquinodimethane charge transfer complexes with dipropylamine derivatives: X-ray structure and polarized reflection spectra

A study of the phase transition in semiconducting 1:2 tetracyanoquinodimethane charge transfer complexes with dipropylamine derivatives: X-ray structure and polarized reflection spectra

Spectroscopic investigation of some building blocks of organic conductors: A comparative study

Raman and microwave surface impedance measurements in the organic superconductor κ-Et2Cu[N(CN)2]BrxCl1−x

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