Spin relaxation studies on conducting poly(tetrathiafulvalene)

Krinichnyi, V.I.; Pelekh, A.E.; Roth, H.-K.; Lüders, Klaus

doi:10.1007/bf03162508

Cited by 10 publications

(4 citation statements)

References 19 publications

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“…Such a change in the shape of PCs spectra has already been observed for doped poly(tetrathia-fulvalene) [14], polyaniline [15] and poly(p-phenylene) [22]. Thus, neutral solitons pinned on short trans-PA chains ate the dominant PCs in as-prepared cis-PA sample.…”

Section: Resultsmentioning

confidence: 76%

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Very high field EPR study ofcis- andtrans-polyacetylene

et al. 1994

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Abstraet. Some neutral cis-and trans-polyacetylene samples have been studied at 30-0.7 mm wave band EPR. A higher speclral resolution allows one to determine the principal values of anisotropic g-tensor of localized paramagnetic centers in polyacetylene, attributed to pinned neutral solitons. The Very High Frequency EPR allows us to observe the increase of a number of such centers and the appearance of soliton diffusion along the polymer chains atter the cis-trans isomerization.

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Section: Resultsmentioning

confidence: 76%

“…Earlier we have shown [12][13][14][15] that the accuracy and informativity of the method increase considerably at investigating the conducting polymers at 2-mm wave band EPR. This paper reports the results of investigating cis-and trans-PA at millimeter and submillimeter (down to , 91 = 0.7 mm) wave band EPR.…”

Section: Introductionmentioning

confidence: 99%

Very high field EPR study ofcis- andtrans-polyacetylene

et al. 1994

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“…Typical 2-mm in-phase absorption and π/2-out-of-phase dispersion EPR spectra of polytetrathiafulvalene registered at room temperature are presented in Figure . This CP has serum heteroatoms in the backbone (see Figure ), so, e.g., PTTF-Me-Ph demonstrates an anisotropic absorption EPR sum spectrum ,, of a localized PC R 1 with slowly temperature dependent magnetic parameters g xx = 2.011 89, g yy = 2.005 44, and g zz = 2.001 85, and a more mobile PC R 2 with g xx = 2.009 28, g yy = 2.006 32, and g zz = 2.002 10. The analogous spectrum of R 1 in PTTF-Et-Ph is characterized by the magnetic parameters g xx = 2.014 24, g yy = 2.006 51, and g zz = 2.002 35, whereas PC with nearly symmetric spectra are registered at g p = 2.007 06.…”

Section: Resultsmentioning

confidence: 99%

The 140-GHz (D-Band) Saturation Transfer Electron Paramagnetic Resonance Studies of Macromolecular Dynamics in Conducting Polymers

Krinichnyi

2008

J. Phys. Chem. B

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The high-field/high-frequency (5 T, 140 GHz) saturation transfer electron paramagnetic resonance (ST-EPR) method was used for the study of superslow librational macromolecular dynamics in various conducting polymers. It was shown that the increase of the electron precession frequency allows separate determination of spin relaxation and dynamics differently affecting effective ST-EPR spectra. Higher microwave frequency increases significantly the spectral resolution of the method and its sensitivity to the anisotropic macromolecular motion in conducting polymers. This broadens the interval of correlation time measured, thereby extending the slow-motion limit for ST-EPR by at least 2 orders of magnitude compared with convenient waveband EPR.

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“…2 occo,/2 dependences [47], where co e = 2n v e is the angular spin precession frequency. As in the case of other conducting polymers with heteroatoms [21,31,48], ABpp oc ~-1 ac co,/z relation is realized for modified PATAC samples (see Fig. 5), thus the spin-charge dynamics in PATAC can be considered in terms of the above mentioned approach.…”

Section: Spin Dynamics In Laser-modified Patac Samplesmentioning

confidence: 99%

Spin charge carrier dynamics in poly(bis-alkylthioacetylene)

2002

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Initial and laser-irradiated poly(bis-alkylthioacetylene) (PATAC) samples were investigated by electron paramagnetic resonance (EPR) at X-band (9.6 GHz), Q-band (37 GHz), and D-band (140 GHz) in a wide temperature range. Two types of paramagnetic centers were proved to exist in lasermodified polymer, namely, localized and mobile polarons with the concentration ratio and susceptibility depending on the irradiation dose and temperature. Superslow torsion motion of the polymer chains was studied by the saturation transfer method at D-band EPR. Additional information on the polymer chain segment dynamics was obtained by the spin probe method at X-band EPR. Spin-spin and spin-lattice relaxation times were measured separately by the steady-state saturation method at D-band EPR. Intrachain and interchain spin diffusion coefficients and conductivity arising from the polaron dynamics were calculated. It was shown that the polaron dynamics in laser-modified polymer is affected by the spin-spin interaction. The interchain charge transfer is stimulated by torsion motion of the polymer chains, whereas the total conductivity of irradiated PATAC is determined mainly by the dynamics of diamagnetic charge carriers. Magnetic, relaxation and dynamics parameters of PATAC were also shown to change during polymer storage.

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Spin relaxation studies on conducting poly(tetrathiafulvalene)

Cited by 10 publications

References 19 publications

Very high field EPR study ofcis- andtrans-polyacetylene

Very high field EPR study ofcis- andtrans-polyacetylene

The 140-GHz (D-Band) Saturation Transfer Electron Paramagnetic Resonance Studies of Macromolecular Dynamics in Conducting Polymers

Spin charge carrier dynamics in poly(bis-alkylthioacetylene)

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