In situhigh-resolution infrared spectroscopy of a photopolymerizedC 60
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Abstract:
Photopolymerized ${\mathrm{C}}_{60}$ film has been studied under a water-vapor-free condition by means of in situ high-resolution (0.25 ${\mathrm{cm}}^{\ensuremath{-}1}$) Fourier-transform infrared (FT-IR) spectroscopy. It was found that the IR spectrum of a pristine ${\mathrm{C}}_{60}$ film changed markedly after 10-h irradiation with a 500 W mercury lamp at a CsI substrate temperature of 27 \ifmmode^\circ\else\textdegree\fi{}C, whereas no change in the IR spectrum of the ${\mathrm{C}}_{60}$ film was observed after 20-h irradiation with the lamp at a substrate temperature of 100 \ifmmode^\circ\else\textdegree\fi{}C. Compared with the previous FT-IR result reported by Rao et al. [Science 259, 955 (1993)], the present IR spectra for the photopolymerized film had many new peaks and the peaks corresponding to the four intrinsic intensive IR-active modes were split. A ${\mathrm{C}}_{60}$ dimer structure is postulated after comparison between the present results and the theoretical IR calculations reported by Adams et al. [Phys. Rev. B 50, 17 471 (1994)] and Pederson and Quong [Phys. Rev. Lett. 74, 2319 (1995)].Two-dimensional infrared spectroscopy
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Mid-infrared spectroscopy has been applied to zeolite structural problems. The infrared spectrum in the region of 200 to 1300 cm-1 is a sensitive tool indicating structural features of zeolite frameworks. Preliminary interpretation suggests infrared specificity for zeolite structure type and group, and for structural subunits such as double rings and large pore openings. It is proposed that the major structural groups present in zeolites can be detected from their infrared pattern. This hypothesis is based on correlation of newly determined infrared spectra of synthetic zeolites with x-ray structure data for most of the known structural classes of zeolites. Other structural information obtained from infrared studies includes framework Si/Al composition, structural changes during thermal decomposition, and cation movement during dehydration and dehydroxylation.
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Two-dimensional infrared spectroscopy
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Two-dimensional infrared spectroscopy
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Wavenumber
Thermal infrared spectroscopy
Bar (unit)
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Infrared spectra of the H2F2 dimer isolated in Ar, N2, CO, and several mixed matrices, are reported and values for all six fundamental vibration frequencies are given for the Ar-isolated dimer. Evidently due to molecular nonrigidity, the relative intensity of ν1 and ν2 of the H2F2 dimer depend strongly on the matrix environment. The HF stretching fequencies for X---HF bimolecules isolated in Ar, with X=Xe, N2, CO, and H2O are observed. Matrix isolated cyclic trimer and higher oligomers of HqFq are observed to have their HF stretching bands in the 3430 to 3175 cm−1 region. The discussion includes a vibrational predissociation lifetime correlation for the vapor phase dimer.
Matrix Isolation
Trimer
Matrix (chemical analysis)
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Characterization
Two-dimensional infrared spectroscopy
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The data presented show that infrared group frequencies are only applicable for specific spectra structure identification when the infrared spectrum of the unknown material is recorded in the same manner as that used to record the infrared spectra used to build the IR group-frequency data base. IR spectra recorded of compounds in different phases such as the liquid, solution, and vapor phase are useful in helping one to determine whether a compound exists in more than one rotational molecular configuration such as rotation of a CHCl 2 group about a C-C=O single bond in compounds of form CHCl 2 -C=O.
Carbonyl group
Base (topology)
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Two-dimensional infrared spectroscopy
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