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Carbon-13 NMR spin–lattice relaxation time study of the molecular motions of 5-nitro-2-(2-pyridinylthio)pyridine

✍ Scribed by Maria E. Amato; Antonio Grassi; Bruno Perly

Publisher
John Wiley and Sons
Year
1990
Tongue
English
Weight
720 KB
Volume
28
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

The motional behaviour of 5‐nitro‐2‐(2‐pyridinylthio)pyridine (NPTP) was ananlysed by ^13^C NMR spin‐lattice relaxation times (T~1~). The analysis of the experimental T~1~ data was performed by using an analytical model to describe the overall and internal motions fo the molecule. The results showed that on exchange exists between the two ‘enantiomeric’ preferred conformations of the molecule, which therefore assumes an enhanced conformationally rigid character in the liquid phase. The motional parameters, derived by the fitting procedure of the relaxation times, showed that strong intermolecular interactions occur in the liquid phase for NPTP and that, in particular, the dipole moment of the mitropyridine ring contributes greatly in determinating the motional dynamics of NPTP.

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