Hydrothermal synthesis, structures, luminescence and magnetic properties of Zn(II) and Cu(II) complexes with new hydrazone ligand

Two new complexes [Zn(HL)2(py)2] (1) and [Cu(HL)]2 (2) have been synthesised from a bidentate Schiff base ligand HL (benzylidene acetophenone benzoyl hydrazone). The crystal structures of complex 1 and complex 2 were determined by single-crystal X-ray diffraction. The data indicate that: the complex 1 crystallizes in the monoclinic space group P2(1)/n, with a (nm) = 1.35816(8), b (nm) = 2.39486(13), c (nm) = 1.41368(8), α (°) = 90, β (°) = 96.0840(10), γ (°) = 90, Z = 4. The complex 2 crystallizes in the triclinic space group P−1, with a (nm) = 1.02483(8), b (nm) = 1.35797(11), c (nm) = 1.38271(11), α (°) = 71.5020(10), β (°) = 78.5850(10), γ (°) = 74.3110(10), Z = 1. Moreover, the unsaturated coordination site of metal ion is occupied by secondary ligand of pyridine. The mononuclear units in 1 and 2 are packed through weak CH⋯π and π–π interactions respectively. The results of analytical, IR and TG analysis studies are presented in this paper. Both the ligand and complex 1 show fluorescence in DMF solutions at room temperature. The complex 2 variable-temperature (300–1.8 K) magnetic test show that there is ferromagnetic intramolecular interaction and weak antiferromagnetic intermolecular interaction.

► We have sythesized a new bidentate Schiff base ligand HL(benzylidene acetophenone benzoyl hydrazone).
► Two new compounds [Zn(HL)2(py)2] and [Cu(HL)]2 have been sythesized from HL.
► The HL and [Zn(HL)2(py)2] have a strong fluorescent substances which can be used as a potential photoactive materials.
► There is a ferromagnetic intramolecular interaction and weak antiferromagnetic intermolecular interaction in [Cu(HL)]2.