Synthesis, characterization and structural studies of binuclear nickel(II) complexes derived from dihydroxybenzaldehyde thiosemicarbazones, bridged by 1,2-bis(diphenylphosphino)ethane

Abstract

The work described in this paper involves the synthesis and structural characterization of Ni(II) complexes derived from dihydroxybenzaldehyde thiosemicarbazones (H 3 L 1 , H 3 L 2 , H 3 L 3 , H 3 L 4 ) and 1,2-bis(diphenylphosphino)ethane (dppe). Ligands and their Ni(II) complexes were characterized by elemental analysis, IR, UV-Vis, ( 1 H, 13 C, 31 P) NMR, as well as magnetic moment and X-ray structure analysis. The results so obtained suggest that the thiosemicarbazone ligands behave as a tridentate ligand which were coordinated with Ni(II) ion through O, N and S atoms. Furthermore, the dppe ligand was coordinated with Ni(II) ion through the P atom. It is concluded that all Ni(II) complexes have a Square-planar geometry.

The BIOLOGICAL EFFICACY OF MIXED LIGAND COPPER(II) COMPLEXES OF N(4)-SUBSTITUTED THIOSEMICARBAZONE AND DIIMINE CO-LIGANDS AS CHELATING N, N’- DONOR LIGAND

“…The azomethine vibration of ligand H(L1) at 1525 cm −1 shifted to 1595 cm −1 on chelation indicating coordination of imine bond to the copper [17,18], whereas a sharp band observed at 970 cm −1 assignable to υ(N−N) of thiosemicarbazone ligands. This characteristics band was shifted to higher frequencies by 15-20 cm −1 on complexation due to the increases in the double bond character and loss of electron density by donation to the copper [19]. Similar changes were observed for all other complexes.…”

“…In all the copper(II) complexes, the G value found within 3.77−4.23, specified negligible exchange coupling effect. In Addition, g || afforded valuable information regarding the nature of the metal-ligand bonding [18,19]. According to Hathaway [21], for an ionic environment g || of the copper(II) complexes have been usually ≥2.3 but the value was <2.3 suggesting a covalent environment of the copper(II) complexes [20] while g || value of the synthesized complexes was achieved <2.3 signify the covalent character of the copper-ligand bonding.…”

Hydrothermal synthesis, crystal structure and Photoluminescent properties; 3D Holmium(III) coordination polymer

“…Recently, the design and syntheses of coordination polymers have attracted a great deal of interest owing to their fascinating architectures, and potential applications in the field of gas adsorption, catalysis, magnetic materials and luminescence [1][2][3][4][5][6][7][8][9]. In particular, the luminescence of lanthanide coordination polymers have unique properties with their high color pureness, long lifetime, narrow band emission, high quantum yields making them particularly valuable in many potential applications such as light-emitting devices, optical communications and photonic devices, biomedical sensors, luminescent probes, fluorescence microscopy and fluoroimmunoassay [10][11][12].…”

Synthesis, characterization and biological studies of cobalt(II), nickel(II), copper(II) and zinc(II) complexes of vanillin-4-methyl-4-phenyl-3-thiosemicarbazone

“…Thiosemicarbazones find various applications depending on the donor atoms of ligands, their flexibility and their ability to coordinate either in neutral or deprotonated form. [1][2][3] Thiosemicarbazones are chelating ligands and their complexes are tools useful for a variety of bioinorganic process. 4,5 Thiosemicarbazones commonly act as bidentate ligand through nitrogen and sulphur atoms.…”