Nuclear quadrupole resonance of 35Cl in phosphonitrilic chloride tetramer
- 1 January 1967
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Transactions of the Faraday Society
- Vol. 63, 2852-2857
- https://doi.org/10.1039/tf9676302852
Abstract
The 35Cl nuclear quadrupole resonance spectra of the two crystalline forms (K and T) of phosphonitrilic chloride tetramer, (PNCl2)4, have been recorded between 77°K and the melting-point. The molecular point symmetries of text-decoration:overline4 in the K-form and text-decoration:overline1 in the T are confirmed, although the latter appears to approach 2/m symmetry as the melting point is reached. A transition temperature in which the K-form goes to the T has been observed at 63±1.5°C. The large frequency difference between axial and equatorial chlorine nuclei in the text-decoration:overline1-molecule is tentatively ascribed to differences in π-character of the P—Cl bonds.Keywords
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