Synthesis and molecular structure of novel zinc(II) complexes: [{Zn(HL)Cl2}n], [Zn2L2Cl2] and [Zn2(µ-OH)LCl2][HL = 4-methyl-2,6-bis(pyrazol-1-ylmethyl)phenol]

Abstract

The synthesis of a new bifunctional ligand, 4-methyl-2,6-bis(pyrazol-1-ylmethyl)phenol (HL), and the structures of its complexes with zinc(II) are described. The ligand reacts with zinc chloride to form a macromolecular complex, [{Zn(HL)Cl₂}_n]1. In basic solution two binuclear zinc(II) complexes, [Zn₂L₂Cl₂2, and [Zn₂(µ-OH)LCl₂]3, are formed under different reaction conditions. The molecular structures of complexes 1 and 2 have been characterized by X-ray diffraction: 1, monoclinic, space group =P2₁/c, Z= 4, a= 12.357(2), b= 12.400(2), c= 14.957(4)Å, β= 100.18(2)°; 2, triclinic, space group =P, Z= 1, a= 9.194(1), b= 10.040(1), c= 10.316(2)Å, α= 114.40(2), β= 115.93(2), γ= 89.16(1)°. The co-ordination sphare of zinc(II) in complex 1 is tetrahedral, in 2 it is distorted square pyramidal.