Sridharan, KR and Ramakrishna, J and Ramachandran, K and Krishnamurthy, SS (1980) NQR Studies of the chloro(amino)cyclotriphosphazenes, N3P3(NHCH2·CH2NH)Cl4, N3P3(NHBut)4Cl4 and N3P3(NHBut)4Cl2. In: Journal of Molecular Structure, 69 (Dec). pp. 105-115.
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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:||Journal Article|
|Additional Information:||Copyright of this article belongs to Elsevier Science B.V.|
|Department/Centre:||Division of Physical & Mathematical Sciences > Physics|
|Date Deposited:||22 Jan 2010 07:07|
|Last Modified:||19 Sep 2010 05:43|
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