Paramagnetic Resonance in Electron-Hole Pairs in C60 Single Crystals Detected by Photoconductivity Measurements

Ossipyan, Yu. A.; Golovin, Yu. I.; Lopatin, D. V.; Моргунов, Р. Б.; Nikolaev, R. K.; Шмурак, С. З.

doi:10.1002/1521-3951(200102)223:3<r14::aid-pssb999914>3.0.co;2-q

Cited by 9 publications

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“…9 In this context it seems important to study the electro-optical properties of fullerene compounds. While the electro-optical properties of pure fullerene crystals [10][11][12] and conjugated polymer/ fullerene composites 13 have been studied, information on electro-optical properties of donor-acceptor complexes of fullerenes is absent. We chose the C 60 charge transfer complex with N,N,N9,N9-tetrabenzyl-p-phenylenediamine, TBPDA?…”

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Photogeneration of free charge carriers in the donor–acceptor complex TBPDA·(C₆₀)₂

et al. 2005

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Section: Introductionmentioning

confidence: 99%

Photogeneration of free charge carriers in the donor–acceptor complex TBPDA·(C₆₀)₂

et al. 2005

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Synthesis, Crystal Structures, Magnetic Properties and Photoconductivity of C₆₀ and C₇₀ Complexes with Metal Dialkyldithiocarbamates M(R₂dtc)_x, where M = Cu^II, Cu^I, Ag^I, Zn^II, Cd^II, Hg^II, Mn^II, Ni^II, and Pt^II; R = Me, Et, and nPr

et al. 2006

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efficiently cocrystallized with fullerene molecules as tetrahedral monomers (6, 12), dimers (1, 7, 11), and tetramers (3, 4). Fullerene molecules form closely packed hexagonal and square layers in 1, 7, and 11, hexagonal and tetragonal 3D structures in 6 and 12, and island motifs in 3 and 4. Complexes 1-15 have a neutral ground state. However, the formation of the complexes with fullerenes changes the environment of paramagnetic Cu II and Mn II. The EPR spectra of 1, 2, 11, and 13 are essentially modified relative to those of pristine Cu(R 2 dtc) 2 because of a weak coordination of Cu II to fullerene

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Fullerene complexes with divalent metal dithiocarbamates: structures, magnetic properties, and photoconductivity

et al. 2007

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A series of complexes of fullerenes C 60 and C 70 with metal dithiocarbamates {M II (R 2 dtc) 2 }•C m (m = 60 or 70) and metal dithiocarbamates coordinated to nitrogen con taining ligands (L), {M II (R 2 dtc) 2 ) x •L}•C 60 (x = 1 or 2), where M = Cu, Zn, Cd, Hg, Mn, or Fe, R = Me, Et, Pr n , Pr i , or Bu n , L is 1,4 diazabicyclo[2.2.2]octane (DABCO), N,N´ dimethylpiperazine, or hexamethylenetetramine, were synthesized. The shape of dithio carbamate molecules is sterically compatible with the spherical shape of C 60 , resulting in an efficient interaction between their π systems. The resulting compounds are characterized by a layered or three dimensional packing of the fullerene molecules. In the C 60 complexes, iron(II) and manganese(II) dithiocarbamates exist in the high spin states (S = 2 and 5/2). The magnetic susceptibility of {M II (Et 2 dtc) 2 } 2 •C m (M = Fe or Mn, m = 60 or 70) in the temperature range of 200-300 K is described by the Curie-Weiss law with Θ = -250 and -96 K and with maxima at 110 and 46 K, respectively, which is indicative of a strong antiferromagnetic spin coupling between M II . The Weiss constants for the [{M II (Et 2 dtc) 2 } 2 •DABCO]•C 60 •(DABCO) 2 com plexes (M = Fe or Mn) are 1.7 and 0.3 K, respectively. The magnetic moments of the complexes containing Fe and Mn dithiocarbamates slightly increase at temperatures below 50 and 35 K, respectively, which is evidence of the ferromagnetic spin coupling between M II in {M II (Et 2 dtc) 2 } 2 •DABCO. Single crystals of the complexes exhibit low dark conductivity (10 -10 -10 -11 S cm -1 ). The visible light irradiation of these crystals leads to an increase in the photocurrent by two-three orders of magnitude. The photogeneration of free charge carriers in the complexes occurs both due to the photoexcitation of metal dithiocarbamate (Cu II (Et 2 dtc) 2 ) and through the charge transfer from metal dithiocarbamate (M II (Et 2 dtc) 2 , M = Zn or Cd) to C 60 .

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Paramagnetic Resonance in Electron-Hole Pairs in C60 Single Crystals Detected by Photoconductivity Measurements

Cited by 9 publications

References 7 publications

Photogeneration of free charge carriers in the donor–acceptor complex TBPDA·(C₆₀)₂

Photogeneration of free charge carriers in the donor–acceptor complex TBPDA·(C₆₀)₂

Synthesis, Crystal Structures, Magnetic Properties and Photoconductivity of C₆₀ and C₇₀ Complexes with Metal Dialkyldithiocarbamates M(R₂dtc)_x, where M = Cu^II, Cu^I, Ag^I, Zn^II, Cd^II, Hg^II, Mn^II, Ni^II, and Pt^II; R = Me, Et, and nPr

Fullerene complexes with divalent metal dithiocarbamates: structures, magnetic properties, and photoconductivity

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Paramagnetic Resonance in Electron-Hole Pairs in C60 Single Crystals Detected by Photoconductivity Measurements

Cited by 9 publications

References 7 publications

Photogeneration of free charge carriers in the donor–acceptor complex TBPDA·(C60)2

Photogeneration of free charge carriers in the donor–acceptor complex TBPDA·(C60)2

Synthesis, Crystal Structures, Magnetic Properties and Photoconductivity of C60 and C70 Complexes with Metal Dialkyldithiocarbamates M(R2dtc)x, where M = CuII, CuI, AgI, ZnII, CdII, HgII, MnII, NiII, and PtII; R = Me, Et, and nPr

Fullerene complexes with divalent metal dithiocarbamates: structures, magnetic properties, and photoconductivity

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Photogeneration of free charge carriers in the donor–acceptor complex TBPDA·(C₆₀)₂

Photogeneration of free charge carriers in the donor–acceptor complex TBPDA·(C₆₀)₂

Synthesis, Crystal Structures, Magnetic Properties and Photoconductivity of C₆₀ and C₇₀ Complexes with Metal Dialkyldithiocarbamates M(R₂dtc)_x, where M = Cu^II, Cu^I, Ag^I, Zn^II, Cd^II, Hg^II, Mn^II, Ni^II, and Pt^II; R = Me, Et, and nPr