ChemInform Abstract: The Synthesis and Isolation of the Stereospecific Ligand, N-(2-Aminoethyl)-2-((2-aminoethyl)thio)acetamide (egeH). Comparison of the Crystal Structure of (Co(ege)(NO2)2)·4 H2O with Related Systems.

ChemInform Abstract

The title ligand (V), isolated as its dihydrobromide salt, deprotonates and forms the Co(III) complex (VIII) (space group I2/c, Z = 8) of only one geometric isomer. The structural determination reveals that the geometry of the backbone ligand is cis-β. In addition, the structures of the complexes (IX) (P2₁/c, Z=4) and (X) (P2₁/a, Z=4), which also contain stereospecific ligands, are determined. The tetradentate ligand in (IX) adopts the cis-β conformation, while for (X) the expected cis-α geometry is seen. The structural parameters are compared and the origins of the attendant stereospecificities are discussed in terms of the nature of the internal donor atoms of the tetradentate ligands.