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Stereospecific Formation of Pentaamine Complexes of Co(III) with Terdentate 2,6‐Bis(aminomethyl)pyridine
Author(s) -
Tinner Ursula,
Marty Werner
Publication year - 1977
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19770600518
Subject(s) - chemistry , aquation , pyridine , denticity , ligand (biochemistry) , amine gas treating , stereospecificity , medicinal chemistry , stereochemistry , catalysis , organic chemistry , kinetics , crystal structure , reaction rate constant , biochemistry , physics , receptor , quantum mechanics
Some pentaamine complexes of Co(III) with 2,6‐bis(aminomethyl)pyridine (bamp), a diamine ligand (or two ammonia ligands) and one unidentate ligand have been prepared (Table 1) . In all these species, bamp remains coordinated meridionally under a variety of conditions as shown by 1 H‐ and 13 C‐NMR. spectroscopy and correlations by stereoretentive reaction cycles. The rates of amine proton exchange and of spontaneous aquation, Hg 2+ ‐induced aquation and base hydrolysis of some chloropentaamine complexes have been determined. They essentially follow the patterns observed for complexes with purely aliphatic amine ligands; the presence of a pyridine donor in these complexes does not suggest deviations from the mechanistic schemes usually proposed for the solvolytic reactions investigated.