Polythiophene and polyacetylene conductors in the 3-cm and 2-mm ESR bands

Krinichnyi, V.I.; Grinberg, Oleg Y.; Nazarova, I.B.; Козуб, Г. И.; Ткаченко, Л. И.; Khidekel, M. L.; Lebedev, Ya. S.

doi:10.1007/bf00951303

Cited by 12 publications

(8 citation statements)

References 5 publications

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“…Highly doped PANI, 44,45,47,48 PT, 29 PPP, 51 and other conductive polymers demonstrate a Dyson-like 52 spectra with the line asymmetry factor A/B ( Fig. 1) due to the formation of a skin layer on the polymer surface at D-band ESR.…”

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confidence: 95%

“…The ClO Ϫ 4 doped PT is characterized by g || ϭ 2.00230, g ⊥ ϭ 2.00239, ∆B pp ϭ 26.3 G, and ∆E σ-π* ϭ 7.1 eV. 29 As the doping level y of PANI-SA exceeds 0.21, the g-factor of PC R 2 becomes isotropic and decreases from g R2 ϭ 2.00418 down to g iso ϭ 2.00314. This effect is accompanied by a narrowing of the R 2 ESR spectrum, and was explained by a depinning of Q1D spin diffusion along the polymer chain and formation of the areas with high spin density in which a strong exchange of spins on neighboring chains occurs.…”

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confidence: 99%

“…29,30 The D-band ESR spectrum of P3OT is a superposition of Gaussian and Lorentzian lines with the anisotropic g-factor typical for PC in some other conductive polymers with heteroatoms. 12 The main components of the g-tensor of PC in P3OT are presented in Table 1.…”

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confidence: 99%

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High‐Field ESR Spectroscopy of Conductive Polymers

Krinichnyi¹

2006

Advanced ESR Methods in Polymer Research

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confidence: 95%

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confidence: 99%

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High‐Field ESR Spectroscopy of Conductive Polymers

Krinichnyi¹

2006

Advanced ESR Methods in Polymer Research

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“…For example, the rhombicity of the electronic g-factor not only improves the sensitivity of HF EPR to local dynamics of spin-labeled biomolecules [1] but also provides an excellent angular resolution which is essential for distance/angle determination from disordered protein samples [2]. HF EPR also brings an enhancement in g-factor resolution allowing one to differentiate free radical and spin adduct species [3] and also enhances the sensitivity of spin-labeling EPR to changes in microenvironment [4,5]. Solvent effects on the magnetic parameters of the nitroxide radicals are well documented in literature [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Resolving domains of interdigitated phospholipid membranes with 95 GHz spin labeling EPR

Smirnov

Smirnova

2001

Appl. Magn. Reson.

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High-field W-band (95 GHz) electron paramagnetic resonance (EPR) study of partitioning of a small nitroxide TEMPO (2,2,6,6-tetramethyl-l-piperidinyloxy) in multilamellar liposomes composed from 1,2-dipalmitoyl-sn-glycero-3-phosphatidylcholine (DPPC) is described. The high-resolution spectra with a high signal-to-noise ratio were combined with automated least-squares simulation analysis to derive accurate partitioning coefficients of TEMPO in the membrane lipid phase and to follow the membrane phase transitions. The isotropic magnetic parameters, g ;. and Ai,o, were used to characterize the average polarity the spin label is experiencing in the membrane. We also report an empirical correlation between gisp and A 1 , o for a set of protic and aprotic solvents and use this correlation to assign domains formed by interdigitation of DPPC bilayer under a high ethanol concentration of 1.2 M.

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“…This will be discussed in terms of non-interacting spin-packets in the next Section. The fact that mobile PCs have a broader line than the immobile ones may be explained by the strong interaction with dopants as shown in [14] for various dopants. So the mobile PCs have probably a stronger interacfion with the dopants than the immobile PCs.…”

Section: Nature and Composition Of Pcs In The Pttfmentioning

confidence: 95%

Spin relaxation studies on conducting poly(tetrathiafulvalene)

et al. 1993

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Abstract. Magnetic parameters and the relaxation behavior of paramagnetic centers in ala iodine-doped poly(tetrathiafulvalene) semiconductor with a d.c. conductivity of 10 -5 S" cm -1 have been studied using mainly the 2 mm waveband EPR technique in the temperature range of 110-270 K. The EPR line shape analysis confirms the existence of immobile radicals pinned on short polymer chains and mobile polarons with different relaxation parameters in slightly doped poly(tetrathiafulvalene). The temperature dependences of electron spin-lattice and spin-spin relaxation times of paramagnetic centers of both types have been determined independently using the saturation method at the operation frequency v~ = 140 GHz. An anisotropic slow libration of immobile polarons with an activation energy of 0.02 eV have been registered for the first time using the saturation transfer EPR method. The temperature dependences of intrachain diffusion and interchain hopping rates in poly(tetrathiafulvalene) are determined from the T 1 and T 2 EPR data. The interchain spin dynamics is shown to correlate with libration of polarons trapped on polymer chains and is in good agreement with a hopping charge transport mechanism.

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Polythiophene and polyacetylene conductors in the 3-cm and 2-mm ESR bands

Cited by 12 publications

References 5 publications

High‐Field ESR Spectroscopy of Conductive Polymers

High‐Field ESR Spectroscopy of Conductive Polymers

Resolving domains of interdigitated phospholipid membranes with 95 GHz spin labeling EPR

Spin relaxation studies on conducting poly(tetrathiafulvalene)

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