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Uptake of Molecular Oxygen by Co(II) Chelates with Peptides in Aqueous Solution. Part XII. Non-covalent Interactions in the Cobalt(II) - Diastereoisomeric Phenylalanyl Dipeptide Systems. Effect on Kinetics of Oxygenation

Kufelnicki A., Świątek A.

Polish Journal of Chemistry

2008

Vol. 82, nr 5

981-991

The interactions of Co(II) with a group of diastereoisomeric dipeptides containing a side chain with the aromatic phenyl ring have been studied in aqueous solution, both under inert atmosphere and in the presence of dioxygen. An effect of stereoselectivity has been observed in the metal promoted deprotonations, examined by glass electrode potentiometry and correlated with the results of UV/Vis spectroscopy. The kinetics of oxygenation were studied by the stopped flow method and related to the potentiometric results.

Uptake of molecular oxygen by Co(II) chelates with peptides in an aqueous colution : Part XI : Stereoselective properties of oxygenated diastereoisomeric dipeptide systems

Kufelnicki A., Świątek M.

Polish Journal of Chemistry

1999

vol. 73 nr 4

579-591

The reaction of oxygen uptake by Co(II) complexes with a group of diastereoisimetric dipeptides, consisting of alanine and leucine in various chiral forms, has been studied in an aqueous solution. The structure of the bridging moiety has been discussed on the basis of spectroscopic results (UV, Vis, near IR, CD, ESR). The effect of stereoselectivity has been confirmed by studies of reversibility of oxygenation. Comparative ESR measurements were done for mixed complexes with imidazole as N-base in the axial position. All of the results were compared with that for glycine dipeptides (containing only one asymmetric atom).