Steric conditions for donor–acceptor interactions in C60 complexes with planar organic donors

Konarev, Dmitri V.; Semkin, V. N.; Graja, A.; Lyubovskaya, R.N.

doi:10.1016/s0022-2860(98)00408-6

Cited by 32 publications

(27 citation statements)

References 40 publications

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“…Charge transfer to C 60 leads to linear frequency changes versus the degree of charge transfer for two [F 1u (2) and F 1u (4)] IR active modes of C 60 at 576 and 1429 cm -1 , respectively. 33 The IR measurements of C 60 doped by alkali metals and anion radical salts of C 60 show that the frequency changes for the F 1u (4) mode are maximal. Its frequency shifts from 1429 cm -1 for C 60 (0) to 1390-1394 cm -1 for C 60 (-1).…”

Section: Resultsmentioning

confidence: 99%

Leuco Crystal Violet as a Dopant for n-Doping of Organic Thin Films of Fullerene C₆₀

et al. 2004

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The triphenylmethane dye crystal violet (CV) and its leuco base, leucocrystal violet (LCV), are investigated as dopants for n-type doping of fullerene C 60 . Conductivities up to 8 × 10 -3 S/cm at 30°C are achieved when C 60 is doped with CV. Mass spectroscopy and optical spectroscopy (UV/VIS/NIR absorption and Fourier transform infrared transmission) confirm that the leuco base LCV is formed during sublimation of the cationic CV dye. When the commercially available LCV was directly used as a dopant in C 60 , a maximum conductivity of 1.3 × 10 -2 S/cm was obtained at 30°C. We found that in both cases, the leuco base became reoxidized to the cationic form by electron transfer to electron-accepting matrixes, leading to the doping effect. The donor properties of LCV in a charge-transfer complex with 7,7,8,8-tetracyanoquinodimethane (TCNQ) were confirmed by UV/VIS/NIR absorption and Fourier transform infrared (FTIR) spectroscopy. C 60 anions were observed in the FTIR or NIR absorption spectra of the mixed films of C 60 and LCV. Photoinduced charge transfer between LCV and C 60 provides free electrons, which increase the n-type conductivity. The electron transfer becomes irreversible by hydride abstraction.

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Section: Resultsmentioning

confidence: 99%

Leuco Crystal Violet as a Dopant for n-Doping of Organic Thin Films of Fullerene C₆₀

et al. 2004

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“…In another reports we accounted that the C=O stretching band is decreased reasonably by 5-10 cm -1 when PVP adsorbs via the C=O moieties on GNPs or C 60 molecules (19,26). A small change in the PVP vibration frequencies briefs a weak CT interaction of PVP exfoliated molecules with nascent C 60 surfaces as a result of an adverse steric effect (16,17,19,(36)(37)(38). Also Raman bands in a C 60 :PVP nanofluid in Figure 4 Hence, both the IR and Raman bands in this investigation unambiguously confer that PVP in water succeed to adhere to C 60 of nascent surfaces via a CT interaction between the C=O moieties of the pyrrolidone ring and C 60 molecules in a C 60 -PVP complex in the form of a stable nanofluid.…”

Section: Ftir and Raman Spectramentioning

confidence: 87%

“…Owing to low reduction potential and high electron affinity (13,14), C 60 forms weak charge-transfer (CT) complexes with various electron donors such as, amines (14,15), hydrocarbons (16,17), polymers (10)(11)(12)18,19), and micelles (20,21). In an experiment, Khairullin et al (18) reported existence of CT processes between C 60 and PVP in the C 60 -PVP composite in support of electron spin resonance experiments.…”

Section: Introductionmentioning

confidence: 91%

Mechanism of Solubilizing Fullerene C₆₀in Presence of Poly(Vinyl pyrrolidone) Molecules in Water

Behera

Ram

2015

Fullerenes, Nanotubes and Carbon Nanostructures

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In this article, a possible mechanism of solubilizing C 60 molecules through poly (vinyl pyrrolidone) PVP is described in exploring its diverse biological, cosmetical, and medicinal activities. Markedly enhanced (~ three times) absorbance, molar extinction coefficient, or oscillator strength in a   * band in the C(sp 2 ) electron transitions of C 60 molecules at 299 nm confers an effective surface adsorption of chromophoric groups of PVP molecules on the carbon surface. High resolution transmission electron and field emission scanning electron microscopic images in C 60 -PVP nanofluids clearly show adsorption of an amorphous PVP surface layer (35-37 nm thickness) on the C 60 nanosurface. An intense dynamic light scattering band measuring an average hydrodynamic length of 306 nm attributes to PVP encapsulated C 60 molecules. An average zetapotential (-) 17.8 mV at 6.5 pH describes PVP molecules aided accumulation of n-electrons on the C 60 surface. Raman and Fourier transform infrared bands show distinctly enhanced intensity in the C=O and C-N stretching vibrations of lactam rings in presence of C 60 molecule as a result of a charge transfer coupling of PVP functional groups with the C 60 nanosurface. A nearly 11% decrease in emission band intensity in the n  n* band of the PVP molecules at 393 nm upon addition of Downloaded by [University of Leeds] at 01:36 06 July 2015 ACCEPTED MANUSCRIPT ACCEPTED MANUSCRIPT 2 4.0 µM C 60 molecules exhibit n-electrons transfer from O-atom of pyrrolidone ring to electron deficient carbon nanosurface in surface modified C 60 molecules.

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“…(32,33). However, in the spectra of the most complexes with amines (1-7, and 9) intense CTBs manifest in the visible and NIR range with the maxima at: LCV (1)F 732, LMG (4)F 727; (5)F 737; (6)F 720, CVL (7)F 727, TBPDA (8)F 896 and TMPDA (10)F 927 nm (Fig.…”

Section: Crystal Structuresmentioning

confidence: 94%

Molecular Complexes of Fullerenes C60 and C70 with Saturated Amines

Konarev

Kovalevsky

Litvinov

et al. 2002

Journal of Solid State Chemistry

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Steric conditions for donor–acceptor interactions in C60 complexes with planar organic donors

Cited by 32 publications

References 40 publications

Leuco Crystal Violet as a Dopant for n-Doping of Organic Thin Films of Fullerene C₆₀

Leuco Crystal Violet as a Dopant for n-Doping of Organic Thin Films of Fullerene C₆₀

Mechanism of Solubilizing Fullerene C₆₀in Presence of Poly(Vinyl pyrrolidone) Molecules in Water

Molecular Complexes of Fullerenes C60 and C70 with Saturated Amines

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Steric conditions for donor–acceptor interactions in C60 complexes with planar organic donors

Cited by 32 publications

References 40 publications

Leuco Crystal Violet as a Dopant for n-Doping of Organic Thin Films of Fullerene C60

Leuco Crystal Violet as a Dopant for n-Doping of Organic Thin Films of Fullerene C60

Mechanism of Solubilizing Fullerene C60in Presence of Poly(Vinyl pyrrolidone) Molecules in Water

Molecular Complexes of Fullerenes C60 and C70 with Saturated Amines

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Leuco Crystal Violet as a Dopant for n-Doping of Organic Thin Films of Fullerene C₆₀

Leuco Crystal Violet as a Dopant for n-Doping of Organic Thin Films of Fullerene C₆₀

Mechanism of Solubilizing Fullerene C₆₀in Presence of Poly(Vinyl pyrrolidone) Molecules in Water