Synthesis, crystal structure and luminescence properties of acenaphthene benzohydrazide based ligand and its zinc(II) complex

Abstract

The complex compound of zinc(II) supported by (Z)-2-hydroxy-N′-(1-oxoacenaphthylen-2(1H) ylidene)benzohydrazide ligand (H₂L¹) has been reported and discussed. The reaction of zinc acetate with H₂L¹ ligand leads to the formation of a mononuclear zinc(ii) complex, [Zn(H¹)₂H₂O]. The ligand, H₂L¹ has been characterized by elemental analysis, ¹H, ¹³C and ¹Hsingle bondCOSY -NMR, IR and ESI-MS, while the complex was characterized by elemental analysis, IR, and ESI-MS. The crystal structures of the free ligand H₂L₁ and the complex have also been determined by single crystal X-ray diffraction. The ligand chelates with metal centre with a nitrogen atom of imino moiety and an oxygen atom of enolic group. The complex shows distorted trigonal bipyramidal geometry around the metal centre with oxygen atoms lying in the equatorial plane and imino nitrogen atoms along the axial direction. The DFT/TD-DFT calculations were performed on both the ligand and its zinc complex to get insight into the structural, electronic and optical properties. The photoluminescence, fluorescence properties of the complex have been investigated.