Abstract
The amide complexes [(NH 3 ) 5 CoNH-C(-O)R](ClO 4 ) 2 (R=H,CH 3 ) are protonated in acidic media, forming yellow, kinetically robust [(NH 3 ) 5 CoNH=C(OH)R] 3+ ions, which have been isolated as crystalline perchlorate salts. NMR ( 1 H, 13 C) spectroscopy establishes in Me 2 SO the preferred site of protonation is the carbonyl oxygen, [(NH 3 ) 5 CoNH=C(OH)H] 3+ exists in two geometrically isomeric forms which are detectable at ambient temperature. The isomerizations have been monitored also by electronic spectroscopy and cation-exchange chromatography, and the reaction kinetics have been investigated for H 2 O, Me 2 SO, and sulfonate solutions
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