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Proton Magnetic Resonance Studies of Heterocyclic Aromatic Amine Adducts of Nickel(II) and Cobalt(II) Acetylacetonate
Author(s) -
Wang WenJwu,
Wei HoHsiang
Publication year - 1978
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.197800031
Subject(s) - chemistry , nickel , cobalt , delocalized electron , unpaired electron , pyridine , adduct , electron paramagnetic resonance , paramagnetism , ring (chemistry) , crystallography , proton nmr , resonance (particle physics) , proton , proton magnetic resonance , photochemistry , computational chemistry , inorganic chemistry , nuclear magnetic resonance , stereochemistry , molecule , medicinal chemistry , organic chemistry , atomic physics , condensed matter physics , physics , quantum mechanics
The proton nmr isotropic shifts of pyridine type ligands coordinated to paramagnetic nickel(II) and cobalt(II) acetylacetonate are reported, and the mechanisms of unpaired electron spin delocalization in these complexes are discussed. It is found that a σ‐delocalization mechanism is in dominant, but the π‐contribution can not be rule out. The calculations of the geometric factor for Co(II) complexes are done. It is used in the ratio method to separate the contribution of pseudo‐contact shift from isotropic shift for Co(II) complexes. The effect of pseudoaromatic chelate ring on contact shift is not so large as previously reported.