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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).

Structure of three selected dirhodium(II) and cobalt(II) phosphane complexes

Gałdecki Z., Gałdecka E., Kowalski A., Pruchnik F., Wajda-Hermanowicz K., Starosta R.

Polish Journal of Chemistry

1999

vol. 73 nr 5

859-872

The crystal structure of the following complexes has been determined using a KM4CCD Kuma Diffraction Diffractometer with CDD camera, and the original KM4CCD data collection and KM4RED data reduction programs: tetrachlorobis{m-phenylbis(2-pyridyl)phosphane(P,N,N')dirhodium(II), [Rh2Cl4{PPh(C5H4N)2}2], (1); tris(m-acetato-kO: -kO')(acetic acid-1-kO)-m-2-{[(2-methoxyphenyl-2kO)(2-methoxyphenyl)phosphano-2-kP]phenolato-1kO}-dirhodium(II), [Rh2(OOCCH3)3{P(C6H4OCH3)2C6H4O}HOOCCH3], (II); dichlorobis{phenylbis(2-pyridyl)phosphane oxide}cobalt(II), [CoCl2{OP(C5H4N)2}2(C6H5)}2], (III).

Uptake of molecular oxygen by Co(II) chelates with peptides in aqueous solution. Part X. Diastereoisomeric dipeptides as auxiliary ligands in oxygen-free complexes

Kufelnicki A., Świątek M.

Polish Journal of Chemistry

1998

Vol. 72, nr 8

1897-1906

Co(II) complexes with group of diastereoisomeric dipeptides consisting of alanine and leucine in various chiral forms have been studied in aqueous solution. The equilibria were determined by potentiometric and spectrophometric methods, using least-squares fotting procedures. The results were compared with those for glycine dipeptides containing only one asymmetric atom.