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1 H NMR and a study of the anomalous temperature dependence of the 35 Cl NQR frequencies in 2‐chloro‐3‐pyridinol
Author(s) -
Raghoottama P. S.,
Soundararajan S.,
Ramakrishna J.
Publication year - 1987
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1260250704
Subject(s) - chemistry , intramolecular force , hydrogen bond , temperature coefficient , proton nmr , phase (matter) , hydrogen , nuclear quadrupole resonance , analytical chemistry (journal) , crystallography , nuclear magnetic resonance , stereochemistry , molecule , organic chemistry , physics , quantum mechanics
A 35 Cl NQR study of 2‐chloro‐3‐pyridinol showed the presence of four NQR signals at 77 K. One of the lines showed a positive temperature coefficient of the NQR frequency. 1 H NMR studies showed the presence of intramolecular hydrogen bonding, and the anomalous NQR temperature dependence has been explained in terms of Bayer and hydrogen bond effects. The room temperature x‐ray structure and the low‐temperature NQR data suggest the presence of a phase transition.