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

• An acenapthene benzohydrazide based ligand and its zinc(II) complex were synthesized.
• The ligand and its Zn(II) complex were structurally characterized by single crystal X-ray diffraction.
• The ligand binds the Zn2+ in 2:1 ratio.
• The zinc(II) complex show fluorescent emission in solution and strong luminescent behavior in the solid state.
• Extensive CH … π and π … π stacking interactions are observed in the solid state.

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(HL1)2H2O]. The ligand, H2L1 has been characterized by elemental analysis, 1H, 13C and 1HCOSY -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.

Figure optionsDownload as PowerPoint slide