The new nickel(II) complexes [Ni3(HL)(H2L)(Py)2](NO3)·2CH3OH (1) and [Ni4(HL)(H2L)(Py)0.363Cl1.635]·1.481CH3OH (2) (where H2L=C15H16N6S, 1,5- bis(salicylaldehyde)thiocarbohydrazone have been synthetized and crystallographycally characterized. Nickel nitrate Ni(NO3)2 and nickel chloride reacted with Schiff base in methanol (in the presence of pyridine) to produce trinuclear complexes 1 and 2. The X-Ray diffraction study revealed that compounds 1 and 2 contains one hexacoordinated nickel ion and two square-planar ones. Each of the two ligands accomodate two azine bridged nickel centers in ONS and ONN coordination pockets. Two donor sets ONN, resulting each from different molecules of the ligand, coordinate meridionally, forming an octahedral environment for one nikel atom. The other two atoms of nickel, which reside in ONS ligand pocket, require additional pyridine ligands to achieve a square-planar geometry. In compound 1 the nitrate ion balance six positive charges of three nickel ions, together with di- and trideprotonated ligands. For compound 2 disorder is observed for some resolved solvent molecules, and for a not covalently bonded chloride anion. On one side of the main molecule a pyridine or a methanol molecules are alternatively hydrogen bonded to one of the N-H groups. The pyridine-methanol occupancy ratio is 0.363(4) to 0.637(4). The pyridine molecule is in addition partially disordered with another methanol molecule with a 0.479(8) occupancy rate. The pyridine molecule was constrained to resemble an ideal hexagon with C-C and C-N bond distance of 1.39 Å On the other side of the molecule the other N-H group is H bonded to a not covalently bonded chlorine atom which was refined as being disordered with another methanol molecule in a 0.635(4) to 0.365(4) ratio. For charge balance reasons the H atom of the N atom was refined as also only 0.635(4) occupied.fgiureFig. 1. Representation of complex ion in compound 1