1970
DOI: 10.1016/0073-8085(70)80011-0
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Extension of the ⪡model⪢ approach to the study of coordination chemistry of vit. B12 group compounds

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Cited by 127 publications
(57 citation statements)
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“…1. The fit is reasonably satisfrictory, suggesting that the process observed is indeed The experimentally observed and calculated syminetrical collapse of the triplet is consistent with [2] being rate-determining, as unsymmetrical collapse would be expected if [3] were not rapid. The 1: 1 and 2: 1 species would probably exhibit difTerent methyl chemical shifts, and collapse would be expected to a position intermediate to these two values if significant amounts of the 1 : 1 complex existed in solution.…”
Section: Proto11 N~iclem Mrrgtzetic Reso~icr~zce Sl~ectrcisupporting
confidence: 56%
“…1. The fit is reasonably satisfrictory, suggesting that the process observed is indeed The experimentally observed and calculated syminetrical collapse of the triplet is consistent with [2] being rate-determining, as unsymmetrical collapse would be expected if [3] were not rapid. The 1: 1 and 2: 1 species would probably exhibit difTerent methyl chemical shifts, and collapse would be expected to a position intermediate to these two values if significant amounts of the 1 : 1 complex existed in solution.…”
Section: Proto11 N~iclem Mrrgtzetic Reso~icr~zce Sl~ectrcisupporting
confidence: 56%
“…Cobalt complexes of tetradentate Schiff-base ligands have been investigated as mimics of vitamin B 12 coenzymes and certain Co III Schiff-base complexes are known to have antiviral, antibacterial, and antitumor properties (15,16). The Schiff-base ligands coordinate to Co II or Co III ions through two amine nitrogen atoms and two phenolic oxygen atoms.…”
Section: Resultsmentioning
confidence: 99%
“…The hexacoordinate complexes derived from acacen and mesalen have octahedral configurations and, as observed in several studies [6], exhibit a marked tendency to pentacoordination. Considering the relatively low temperatures at which the hexacoordinate complexes derived from the acacen and mesalen ligands begin to lose the axial base, it may be said that in effect these complexes are easily converted into pentacoordinate ones which show an appreciable stability Moreover, by observing the temperatures at which decompositions begin, one can see that the stability of the cobalt-axial base bond for both types of complexes decreases in the following order:…”
Section: Discussionmentioning
confidence: 81%