Add time:08/15/2019         Source:sciencedirect.com

X-ray structural analyses have been made on single crystals of mer(N)-[Co(5-dptma)(NO2)2] (A), mer(N)-[CoCl(5-dptma)(H2O)] Br (B), mer(N)-[CoCl(5-dptma)(H2O)]ClO4 (C) and mer(N)-[CoCl(5-dptma)(H2O)] NO3 (D), where H(5-dptma) is N,N-bis(3-aminopropyl)glycine. Complex A crystallizes in the monoclinic space group P21/c as a racemate; complex B in the monoclinic space group P21/n as a racemate; complex C in the orthorhombic space group P212121 as a conglomerate; and complex D in the orthorhombic space group Pna21 as a racemate. In these complexes, the tripod quadridentate 5-dptma coordinates to cobalt(III) with its three nitrogen atoms on a meridian of the coordination octahedron and with the six-membered chelate rings assuming the chair conformation. In A the molecular planes of the NO2− ligands are anchored by intramolecular and intermolecular hydrogen bonds to the amine protons. The molecular planes of the aqua ligands in B, C and D are anchored by two intermolecular hydrogen bonds; one with the carbonyl oxygen atom and the other with the counter anion.

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