Two new Cu(II) and Ni(II) 1,10-phenanthroline complexes with anions of barbituric acids in the outer sphere: Synthesis, structure, spectroscopic, magnetic and thermal properties.

Abstract

Two new complexes [Cu(Phen)2(H2O)](Hba)2∙3H2O (1) and [Ni(Phen)3](Htba)2]∙Phen∙2H2O (2) (Phen ¼ 1,10-phenanthroline, Hba ¼ barbiturate ion, Htba ¼ thiobarbiturate ion) have been synthesized and characterized by elemental analysis, single-crystal and powder XRD, magnetic measurements, TG-DSC, FT-IR, and Vis absorption spectra. Complex 1 shows a distorted square pyramidal geometry around the copper (II) metal center. The coordination around the Ni atom is a distorted octahedron NiN6. The 3D and 2D supramolecular structures of 1 and 2 are formed respectively by intermolecular H-bonds. Two NeH/O hydrogen onds in 1, and NeH/O, NeH/S hydrogen bonds in 2 form infinite chains. As a result of pep interactions, similar 4-membered zigzag hains in structures 1 and 2 respectively are formed.