ISSN:
1572-8854
Keywords:
Amino acid complexes
;
[Co(III)(trien)]+3
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
,
Physics
Notes:
Abstract Seven β2 complexes have been investigated and the structural parameters compared with literature values and molecular mechanics calculations. All β2 compounds exhibit the (S,S,λλδ) or, (R,R,δδλ) configuration. Three of the β2 complexes have monocoordinated amino acids or amino acid esters while the amino acid is chelated in the others. The Co−N bondtrans to the amino acid oxygen or a Cl− varies significantly in length due to thetrans-effect. The chelate rings are twisted to minimize torsional interactions and the changes in conformation in the various structures can be modeled by molecular mechanics. In one complex the carbonyl groups of enantiomeric complexes are bridged by silver ions. In β2[Co(trien)(C-formylglycine)]Cl2 · H2O the carbonyl oxygen of the chelated amino acid is protonated and the formyl group exists in the enol form.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01671678
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