A new amino alcohol N_pyN_imineN_amineO_alcohol-donor ligand: coordination toward zinc(II) and cadmium(II) halides and enantioselective products

Abstract

In the present work a new ligand, 2-(2-(phenyl(pyridin-2-yl)methyleneamino)ethylamino)ethanol (L), and its Zn(II) and Cd(II) complexes, [Zn(L)Br₂] (1), [Cd(L)Br₂] (2) and [Cd(L)I₂] (3), have been synthesized and characterized by elemental analysis, FT-IR, Raman and ¹H NMR spectroscopies as well as X-ray crystallography. All complexes are isostructural and their metal ions have distorted square pyramidal geometry with an MN₃X₂ (X: Br, I) environment. During the complexation process, the amine group of the ligand becomes a chiral center. In the solid-state, an R-configuration was observed in all three complexes. Furthermore, the molecules form intermolecular C–H⋯O, C–H⋯X and O–H⋯X (X: Br, I) hydrogen bonds in the solid-state.

Keywords:

• Crystal structure
• amino alcohol
• chiral synthesis
• cadmium(II)
• zinc(II)