Nickel(II) complexes based on L-amino-acid-derived ligands: synthesis, characterization and study of the role of the supramolecular structure in carbon dioxide capture.

The formation of the symmetrical μ-carbonate-bridged self-assembled trinuclear Ni complex Na{[Ni(LO)(HO)](μ-CO)} (LO is the carboxylate anion of a L-tyrosine derivative), involves atmospheric CO uptake. The asymmetric unit of the complex comprises an octahedral coordination for the Ni with two L-tyrosine-based ligands, a water molecule and one O atom of the carbonate bridge. The Ni-μ-CO core in this compound is the first reported of this kind according to the Cambridge Structural Database (CSD).

Synthesis, crystal structure and study of the crystal packing in the complex bis(4-aminopyridine-κN)dichloridocobalt(II).

Despite the large number of reported crystalline structures of coordination complexes bearing pyridines as ligands, the relevance of π-π interactions among these hereroaromatic systems in the stabilization of their supramolecular structures and properties is not very well documented in the recent literature. The title compound, [CoCl(CHN)], was obtained as bright-blue crystals suitable for single-crystal X-ray diffraction analysis from the reaction of 4-aminopyridine with cobalt(II) chloride in ethanol. The new complex was fully characterized by a variety of spectroscopic techniques and single-crystal X-ray diffraction.