Crystal structure of conglomerates of trans(O)-N(2-aminoethyl)-N-(carboxymethyl) glycinatoaquachlorocobalt(III) and of mer(N)-N,N,-bis(2-aminoethyl) glycinatoaquachlorocobalt(III) perchlorate

Add time:09/03/2019    Source:sciencedirect.com

The title complexes trans(O)-(Co(aeida)Cl(H2O)] (A) and mer(N)-[CoCl (i-dtma)(H2O)] ClO4 (B) crystallize as a conglomerate (H2aeida = N-(2-aminoethyl)-N-(carboxymethyl)glycine, Hi-dtma = N,N-bis(2-aminoethyl)glycine). The X-ray crystallographic analysis shows that single crystals of A and B are chiral. Although the conglomerate formation of either A and B was not observed in the crystal morphology under a microscope, it was confirmed by the Weissenberg photography method. In A, the chirality originates from the δ or λ conformation of the ethylenediamine chelate ring. In B it originates from the fact that chiralities due to the δ and λ conformation of the two ethylenediamine chelate rings in the complex do not cancel out, owing to the asymmetry derived from the rotational configuration of the aqua ligand. These chiral molecular configurations are closely related with intermolecular hydrogen bonds in the crystal.

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