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Multinuclear NMR study of some organoplatinum complexes containing multifunctional azines as chelating ligands
Author(s) -
Gudat Dietrich,
Dogan Akbey,
Kaim Wolfgang,
Klein Axel
Publication year - 2004
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.1407
Subject(s) - chemistry , azine , platinum , ligand (biochemistry) , crystallography , nuclear magnetic resonance spectroscopy , stereochemistry , medicinal chemistry , organic chemistry , biochemistry , receptor , catalysis
Abstract 1 H‐detected indirect NMR techniques were used to determine 15 N and 195 Pt NMR parameters for a series of organoplatinum(IV) complexes and one platinum(II) complex containing nitrogen‐based azobispyridine, bispyridyltetrazine, and bipyrimidine ligands. The inverse technique permitted the detection of small 4 J (Pt,H) and 5 J (Pt,H) long‐range couplings and the acquisition of 15 N NMR data in natural isotopic abundance via n J (N,H) intra‐ and inter‐ligand couplings, but failed in cases where coherence transfer is quenched by rapid relaxation of the metal atom. In one case, analysis of satellite patterns in a set of 1 H, 15 N, 1 H, 195 Pt and 1 H, 13 C correlation spectra allowed a positive sign to be determined for 1 J (Pt, 15 N). Qualitative arguments are presented to explain the observed 15 N coordination shifts in complexes with different azine ligands in terms of azine–M dative bond formation and L n M–azine back‐donation. Copyright © 2004 John Wiley & Sons, Ltd.