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Low temperature Raman study of dimethylacetylene

Mohaček Grošev, Vlasta; Furić, Krešimir (1999) Low temperature Raman study of dimethylacetylene. Journal of Molecular Structure, 482 (SI). pp. 653-659. ISSN 0022-2860

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Abstract

On the basis of low temperature Raman spectra from 10 to 170 K of polycrystalline dimethylacetylene (DMA), two stable and two metastable crystalline phases were detected. One can be identified with a previously reported metastable phase [N. Prasad, R. Kopelman, Chem. Phys. Lett. 20 (1973) 513-516] and can be observed from 10 to 75 K, when it transforms into another metastable phase. This one, in turn, transforms at 115 It into the stable C2/m phase. To enable better assignment of the observed internal modes, especially those involving methyl group, matrix isolation of DMA at 10 K was performed. In the recorded Raman spectra at matrix ratios of 1:100, 1:50 and 1:25, the strongest bands observed are of a(1s) symmetry. Besides them, we were able to detect bands at 218 and 1040 cm(-1) of e(1d) symmetry, which are only infrared active when no intermolecular interactions are present. The Raman spectrum of DMA as a thin solid film was also recorded. The bands' positions are found not to deviate significantly in comparison with the spectra of the matrix isolated sample, and thanks to the better signal to noise ratio, several additional bands were detected. Among those is the nu(8) at 1147 cm(-1) of a(4s) symmetry. (C) 1999 Elsevier Science B.V. All rights reserved.

Item Type: Article
Additional Information: NOTICE: this is the author’s version of a work that was accepted for publication in Journal of Molecular Structure. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Molecular Structure, 482, SI, February, 1999. DOI: 10.1016/S0022-2860(99)00023-X
Uncontrolled Keywords: dimethylacetylene; Raman spectroscopy; phase transition; matrix isolation; fundamental-band; rotation; matrix; diffraction; methanol
Subjects: NATURAL SCIENCES > Chemistry
NATURAL SCIENCES > Chemistry > Physical Chemistry
Divisions: Division of Materials Physics
Projects:
Project titleProject leaderProject codeProject type
Raspršenje svjetla, interakcije i dinamika materijeKrešimir Furić00980303MZOS
Depositing User: Vlasta Mohaček Grošev
Date Deposited: 08 Jan 2014 09:07
Last Modified: 16 Jan 2015 09:36
URI: http://fulir.irb.hr/id/eprint/1229
DOI: 10.1016/S0022-2860(99)00023-X

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