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13 C NMR of Pd–aryl complexes. Chemical shifts and Pd π‐back‐bonding
Author(s) -
MartinezViviente Eloisa,
Pregosin Paul S.,
Tschoerner Matthias
Publication year - 2000
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/(sici)1097-458x(200001)38:1<23::aid-mrc606>3.0.co;2-x
Subject(s) - chemistry , palladium , chemical shift , delocalized electron , aryl , carbon 13 nmr , ligand (biochemistry) , chelation , ring (chemistry) , medicinal chemistry , electron delocalization , nmr spectra database , proton nmr , stereochemistry , spectral line , crystallography , organic chemistry , catalysis , biochemistry , receptor , physics , astronomy , alkyl
13 C NMR spectra for a series of dinuclear acetate‐bridged cyclopalladated N ‐methyl‐ N ‐nitrosoanilines and several mononuclear ortho ‐substituted palladium–aryl complexes with the chelating nitrogen ligands TMEDA and bipyridine were recorded. The coordination chemical shifts for the para carbons in the Pd–aryl ring, Δδ C4 (= δ C4 complex −δ C4 ligand), are found to be ca −3 to −6 ppm. Despite the possibility that these low‐frequency shifts might arise from delocalization of electrons from the palladium(II), it is suggested that these observations are not directly related to increased electron density at this carbon center. Copyright © 2000 John Wiley & Sons, Ltd.