Cobalt, tris conformation structure

Cobalt, trichlorotris(l,2-ethylenediamine)-conformation, 1, 197 Cobalt, (triethylcnetetramine)-isomerism, 1, 200,201 Cobalt, trinitrato-structure, 1,67 Cobalt, tris(acetylacetone)-structure, 1, 62,65,67 Cobalt, tris(bipyridyl)-structure, 1,64... 

Cobalt, tris(l,2-ethanediamine)-conformation, 1,25,197 polarography, 1,481 racemization, 1, 466 solid state, 1,466,467 reactions, 1, 27 redox potential, 1, 514 structure, 1, 67... 

Cobalt, tris(l,2-propanediamine)-complexes structure, 1, 25 conformation, 1,25 nomenclature, 1, 129 stereonotation, 1,129... 

The two cobalt(III) hexaamines with relatively short metal-donor distances considered here are [Co(7ra s-diammac)]3+ trans-diammac is trans-1,4,8,11 -tetraazacy-clotetradecane-6,13-diamine, see Fig. 17.11.1) and [Co(trap)2]3+ (trap is 1,2,3-tri-aminopropane, see Fig. 17.11.2). There are three conformers of [Co(taa s-di-ammac)]3+ (35, 51,15 where 5 and 1 refer to the conformation of the five-mem-bered chelate rings in the complex - see also Section 17.3). The A<5-conformer is the most stable form and has been characterized by an X-ray diffraction study. 15-[Co(fra .v-diammac)]3+ has very short Co-N bonds (1.937A (four equatorial bonds), 1.946 A (two axial bonds)), and the experimentally determined high ligand field and the strongly negative redox potential confirm that these structural features are conserved in solution190 231,2811. 

The twist boat form is chiral and there are two enantiomeric conformations. The chirality can be defined in the same way as a cobalt-ethylenediamine ring and designated as S and X. The third form, a boat form cannot be accommodated to form a tris(bidentate) complex and, in fact, such a structure has not yet been reported. Niketii and Woldbye showed that there exist 16 possible conformers of the [M(tn),] system for each of the absolute configurations A and A, in which they adopt the three stable configurations chair andS- and X-skew boat forms (32). 

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