Low frequency vibrations and molecular structure of (CH3)2NPF2

Autor:	J. M. Casper, J. R. Durig
Rok vydání:	1972
Předmět:	Chemistry Analytical chemistry Torsion (mechanics) Infrared spectroscopy General Chemistry Low frequency Atmospheric temperature range Condensed Matter Physics symbols.namesake Far infrared Structural Biology symbols Moiety Molecule Physics::Chemical Physics Raman spectroscopy Spectroscopy
Zdroj:	Journal of Crystal and Molecular Structure. 2:1-6
ISSN:	1572-8854 0308-4086
DOI:	10.1007/bf01198362
Popis:	The far infrared spectrum, from 33 to 500 cm−1, of (CH3)2NPF2 has been recorded in both the gaseous and solid states. The Raman spectrum of both the liquid and solid was also recorded. The three low frequency PF2 and three NC2 bending modes as well as the P-N torsion have been assigned. If these bending modes are sensitive to conformational changes, as found in previous studies, then the molecule exists in only one conformation in the gaseous, liquid and solid states for the temperature range −190 to 150 °C. A methyl torsion was assigned at 189 cm−1 and a barrier to internal rotation of 2·1 kcal/mole was calculated. This low barrier value is discussed in terms of a planar NC2 moiety.
Databáze:	OpenAIRE
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