Structural characterization and DFT study of bis{(S)-2-[(2-hydroxybenzyl)amino]-3-(4-hydroxyphenyl)propanoato-κ2N,O}(1,10-phenanthroline-κ2N,N′)cadmium(II) tetrahydrate

Abstract

In the title compound, [Cd(C16H16O3)2(C12H8N2)]·4H2O, the Cd ion lies on a twofold rotation axis and is chelated by two monodeprotonated residues of the l-tyrosine-derived ligand (S)-2-[(2-hydroxybenzyl)amino]-3-(4-hydroxyphenyl)propanoic acid (L) in a κ2N,O amino acid chelating mode, exhibiting an (N,N′)-trans disposition, and by 1,10-phenanthroline in a κ2N,N′ mode. The latter ligand is also located about the twofold rotation axis that bisects the central six-members ring. The phenolic groups remain protonated and non-coordinating and take part as acceptors in the intramolecular hydrogen bonds with the amino groups of the acido ligands. The Cd ion is six-coordinated in a distorted octahedral environment. In the crystal, O—H...O hydrogen bonds result in the formation of three-dimensional network structures. The title complex has also been characterized by IR and 1H NMR spectroscopy and DFT studies. The crystal studied was refined as an inversion twin.

Keywords

• crystal structure
• CdII complex
• distorted octahedral geometry
• O—H...O hydrogen bonding
• π–π stacking interactions