Theoretical studies of the infrared and Raman spectra of perylene

Ong, Kate K.; Jensen, James O.; Hameka, Hendrik F.

doi:10.1016/s0166-1280(98)00266-8

Cited by 90 publications

(55 citation statements)

References 15 publications

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“…31 These oscillations are at 70 and 47 cm -1 for Pe and PeCN, respectively, and can be ascribed to low-frequency Raman modes of these molecules. 32,33 In a longer time scale, the fluorescence intensity of Pe and PeCN in CB decays exponentially with lifetimes of 4.4 and 4.6 ns, respectively. Figures 2 and 3 show the fluorescence decay of Pe and PeCN in several donating solvents.…”

Section: Resultsmentioning

confidence: 99%

Fluorescence Quenching in Electron-Donating Solvents. 2. Solvent Dependence and Product Dynamics

2004

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The electron transfer quenching dynamics of excited perylene and cyanoperylene in various donating solvents has been investigated by using ultrafast fluorescence up-conversion and multiplex transient grating. The strongly nonexponential fluorescence decays have been analyzed by using the orientational model described in the first article of this series (J. Phys. Chem. A 2003, 107, 5375). It appears that the solvent dependence of the quenching dynamics is strongly connected to the number of surrounding donor molecules enabling ultrafast electron transfer. This number depends mainly on the driving force for electron transfer, on steric interactions, and on the occurrence of dipole-dipole interactions with the acceptor. The quenching product is an exciplex with a strong charge-transfer character. The complicated wavelength dependence of the fluorescence dynamics in the exciplex region, as well as the spectral dynamics observed in the transient grating data, is attributed to dipolar solvation, which leads to an increase of the charge-transfer character of the exciplex. The strong donor dependence of the exciplex lifetime is very similar to that reported earlier for the charge recombination time of geminate ion pairs in acetonitrile, and can be rationalized in terms of different intramolecular reorganization energies and electronic coupling constants.

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Section: Resultsmentioning

confidence: 99%

Fluorescence Quenching in Electron-Donating Solvents. 2. Solvent Dependence and Product Dynamics

2004

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“…S1m-S1n for PR 123 and PR 179) can be found at 1300, 1380, and 1450 cm 1 and the related deformation vibrations are centred at 540 cm 1 . 22,23 The spectral features of PV 1 and PV 2 representing triarylcarbonium pigments ( Fig. S1o-S1p) can be assigned according to published spectra of xanthene compounds 24,25 with stretching and the deformation vibrations at 400, 610, 770, 990, 1360, 1510, 1757, 1600, and 1650 cm 1 .…”

Section: Pure Pigmentsmentioning

confidence: 99%

Raman spectroscopy of synthetic organic pigments used in 20th century works of art

Schulte

Brzezinka

Lutzenberger

et al. 2008

J Raman Spectroscopy

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Raman microscopy allows a non-destructive characterisation of inorganic and organic painting materials such as pigments and organic dyestuffs. The objectives of this study are the more recent organic pigments typically present in paintings and other art works from the 20th century. More than 20 organic synthetic pigments from different chemical classes could be identified by Raman spectroscopy using different excitation wavelengths (457.9, 476.5, 487.9, 514.5, 632.8, and 1064 nm). To evaluate the performance for real paint samples, varying paint mixtures of the Hansa Yellow pigment PY 3 and the binding medium Mowilith, a polyvinyl acetate (PVAC) compound, were characterised; PY 3 was determined at a 1 wt% level in the binder. In addition, commercial tube paints containing the quinacridone violet PV 19 were studied. The pigment was clearly identified in all of these more complex oil and acrylic paints. Finally, alizarin (PR 83) and a green copper phthalocyanine pigment (PG 7) could unambiguously be identified by Raman microscopy in the painting 'Woman with mandolin in yellow and red' of Max Beckmann dating 1950. The discovery of a red naphthol AS pigment by Raman spectroscopy in a sample from the 'Three field workers' by Georg Baselitz (1964/1965) demonstrated that in some cases complementary chromatographic methods are needed for a comprehensive identification of the organic pigments.

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“…In general, several vibrational modes will contribute to the absorption spectrum of any aromatic chromophore and this holds true also in the case of perylene [36,37]. The room temperature spectra, however, could be simulated rather well by a single-mode description.…”

Section: A Reference Modelmentioning

confidence: 99%