Sridharan, K. R. ; Ramakrishna, J. ; Ramachandran, K. ; Krishnamurthy, S. S. (1980) NQR studies of the chloro(amino)cyclotriphosphazenes, N3P3(NHCH2·CH2NH)Cl4, N3P3(NHBut)4Cl4 and N3P3(NHBut)4Cl2 Journal of Molecular Structure, 69 . pp. 105-115. ISSN 0022-2860
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Official URL: http://linkinghub.elsevier.com/retrieve/pii/002228...
Related URL: http://dx.doi.org/10.1016/0022-2860(80)85269-0
Abstract
The frequencies and variable-temperature behaviour of 35Cl nuclear quadrupole resonance in three aminocyclophosphazene derivatives are reported. The observed frequencies and multiplicity are correlated with the disposition of the substituents and the crystal structure. The temperature-dependence data are discussed in the framework of Bayer-Kushida-Brown equations and low-lying torsional (librational) frequencies and their average temperature coefficients are estimated. Brown's parabolic equation provides a good fit to the experimental data. Variable-temperature proton FT-NMR measurements (at 270 MHz) have also been carried out. The results are consistent with the NQR data and indicate the presence of two-site chemical exchange of the -NH protons and hydrogen bonding.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| ID Code: | 17778 |
| Deposited On: | 16 Nov 2010 12:42 |
| Last Modified: | 08 Jun 2011 07:14 |
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