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• W2028454033 abstract "The utility of recording Raman spectroscopy under liquid nitrogen, a technique we call Raman under nitrogen (RUN), is demonstrated for ferrocene, uranocene, and thorocene. Using RUN, low-temperature (liquid nitrogen cooled) Raman spectra for these compounds exhibit higher resolution than previous studies, and new vibrational features are reported. The first Raman spectra of crystalline uranocene at 77 K are reported using excitation from argon (5145 Å) and krypton (6764 Å) ion lasers. The spectra obtained showed bands corresponding to vibrational transitions at 212, 236, 259, 379, 753, 897, 1500, and 3042 cm−1, assigned to ring–metal–ring stretching, ring–metal tilting, out-of-plane CCC bending, in-plane CCC bending, ring-breathing, C–H bending, CC stretching and CH stretching, respectively. The assigned vibrational bands are compared to those of uranocene in THF, (COT)2−, and thorocene. All vibrational frequencies of the ligands, except the 259 cm−1 out-of-plane CCC bending mode, were found to increase upon coordination. A broad, polarizable band centered about ∼460 cm−1 was also observed. The 460 cm−1 band is greatly enhanced relative to the vibrational Raman transitions with excitations from the krypton ion laser, which is indicative of an electronic resonance Raman process as has been shown previously. The electronic resonance Raman band is observed to split into three distinct bands at 450, 461, and 474 cm−1 with 6764 Å excitation. Relativistic density functional theory is used to provide theoretical interpretations of the measured spectra." @default.
• W2028454033 created "2016-06-24" @default.
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• W2028454033 date "2004-02-08" @default.
• W2028454033 modified "2023-09-27" @default.
• W2028454033 title "Raman under nitrogen. The high-resolution Raman spectroscopy of crystalline uranocene, thorocene, and ferrocene" @default.
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• W2028454033 doi "https://doi.org/10.1063/1.1637586" @default.
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