[Synthesis and spectral studies of nickel(II) complex of 2,6-bis [N-(1,1'-dimethyl-2'-hydroxy) carbamoyl]pyridine].

The ligand of 2,6-bis[N-(1,1'-dimethyl-2'-hydroxy)carbamoyl]pyridine and its nickel(II) complex were synthesized and characterized by using 1H-NMR, 13C-NMR, FTIR, UV-Vis and elemental analysis, and the complex formulae of C15 H21 N3O4 Ni x H2O were determined. The spectral property of the free ligand and its nickel(II) complex was discussed with the comparison method, and then the structure of nickel(II) complex was determined. The spectral analysis results show that 2,6-bis[N-(1,1'-dimethyl-2'-hydroxy)carbamoyl] pyridine acts as a tridentate ligand, coordinating through two nitrogen atoms of amide anion and one nitrogen atom of aromatic pyridine-ring, and the nickel(II) ion is a four-coordinated geometry with dsp2 hybrid orbitals for bonding these coordinating atoms.

Interaction of cobalt(II) and nickel(II) with a gamma-linked, bis-beta-diketone ligand to yield an unusual coordination motif.

Discrete cobalt(II) and nickel(II) complexes of type ML (where L is a bis(2,4-pentanedionate) derivative incorporating a -SCH2CH2S- bridge between the gamma-carbons of respective beta-diketone units) have been synthesised and represent the first examples in which a gamma-substituted, thioether-containing beta-diketone ligand coordinates via a sulfur and oxygen donor in preference to the classical coordination mode involving both beta-diketonate oxygens.