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13C NMR of Pd–aryl complexes. Chemical shifts and Pd π-back-bonding

✍ Scribed by Eloisa Martinez-Viviente; Paul S. Pregosin; Matthias Tschoerner

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
86 KB
Volume
38
Category
Article
ISSN
0749-1581

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✦ Synopsis

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, υ C4 (D υ C4 complex υ 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.

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