Synthesis, spectroscopic, crystal structures and photoluminescence studies of cadmium(II) complexes derived from di-2-pyridyl ketone benzoylhydrazone: Crystal structure of a rare eight coordinate cadmium(II) complex

Add time:08/08/2019    Source:sciencedirect.com

Four cadmium(II) complexes, [CdL2] (1), [Cd(HL)Cl2] (2), [Cd(HL)Br2] (3) and [Cd(HL)(NO3)2(H2O)] (4) of di-2-pyridyl ketone benzoylhydrazone (HL) have been synthesized and characterized by different physico-chemical methods. The tetradentate aroylhydrazone acts as a tridentate ligand in all the complexes, bonding through iminol or amido oxygen, azomethine and pyridyl nitrogens. The molecular structures of all monomeric complexes were determined by single crystal X-ray diffraction studies. The complexes, [CdL2] (1) and [Cd(HL)Cl2] (2) got crystallized in a monoclinic space group whereas the other two complexes [Cd(HL)Br2] (3) and [Cd(HL)(NO3)2(H2O)] (4) in a triclinic crystal system. The complex [CdL2] (1) has a distorted octahedral geometry with two deprotonated monoanionic hydrazone moieties satisfying the coordination whereas in [Cd(HL)Cl2] (2) and [Cd(HL)Br2] (3), the pentacoordination around Cd(II) is satisfied by neutral N, N, O – chelated hydrazone and two anions chloride and bromide respectively. In [Cd(HL)(NO3)2(H2O)] (4), cadmium shows octacoordination and nitrate ion binds both in anisobidentate and bidentate fashion. The thermal stability and the nature of water molecule in complex [Cd(HL)(NO3)2(H2O)] (4) was studied. The nature of emission was found to be quenched in all complexes.

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