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14 N NMR of amminecobalt(III) compounds
Author(s) -
Kofod Pauli
Publication year - 2003
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.1210
Subject(s) - chemistry , chemical shift , ligand (biochemistry) , nitrogen , coordination complex , nuclear magnetic resonance spectroscopy , stereochemistry , medicinal chemistry , crystallography , organic chemistry , metal , receptor , biochemistry
Abstract Directly detected ammine 14 N NMR chemical shifts of 20 amminecobalt(III) compounds are reported. The coordination shifts, δ CS = δ coord − δ free , are in all cases negative and range from −4.4 ppm for the trans ammine ligand in [Co(NH 3 ) 5 (CH 3 )] 2+ to −73.6 ppm for the trans ammine ligand in [Co(NH 3 ) 5 (F)] 2+ . Among the ligands studied, the NO 2 − ligand is unique in that it exerts a significant cis influence. The regularity in trans or cis influences upon the ammine nitrogen chemical shifts provides a basis for assignments in cases where this cannot be deduced from intensity ratios. Copyright © 2003 John Wiley & Sons, Ltd.