Synthesis, characterization and crystal structures of nickel(II) and zinc(II) compounds derived from N,N’-bis(4-bromo-2-hydroxybenzylidene)-2-hydroxy-1,3-propanediamine

Abstract

A new Schiff base compound N,N’-bis(4-bromo-2-hydroxybenzylidene)-2-hydroxy-1,3-propanediamine (H2L) has been prepared. With the Schiff base as ligands, two new nickel(II) compounds [NiL] (1) and [Ni3L2(CH3COO)2(CH3OH)2] (2), and two new zinc(II) compounds [ZnL(OH2)] (3) and [Zn3L2(CH3COO)2]·CH3OH·2dmf (4), were synthesized. The Schiff base and the four coordination compounds have been characterized by means of elemental analysis, IR and UV–Vis spectra, as well as 1H and 13C NMR spectra (for H2L). Structures of H2L and the coordination compounds were further determined by single crystal X-ray diffraction. The Ni atom in compound 1 is in square planar coordination, and those in compound 2 are in octahedral coordination. The Zn atom in compound 3 is in square pyramidal coordination. The outer and inner Zn atoms in compound 4 are in square pyramidal and octahedral coordination, respectively. The self-assembly of the coordination compounds is discussed.