Reaction of aqueous solutions of Ni(NO3)2 and pyridoxal semicarbazone (PLSC) in the presence of NaN3 afforded two complexes, viz. green, paramagnetic binuclear octahedral [Ni-2,(PLSC)2(41,,-N-3)2(N-3)(2)] 2H(2)O (1) and, as admixture, red, octahedral [Ni(PLSCH)21 - 2H(2),O (2) complex. Under the same reaction conditions, pyridoxal thiosemicarbazone (PLTSC) gave only one diamagnetic square-planar, red complex (Ni(PLTSC-H)N-3]center dot H,0 (3). In the absence of NaN3, the reaction of PLTSC and Ni(NO3)2 yielded brown paramagnetic octahedral complex [Ni(PLTSC)21(NO3)2 - H2O (4). The complexes were characterized by elemental analysis, conductometric and magnetochemical measurements, IR and UV-Vis spectra, and the octahedral complexes 1, 2 and 4 also by X-ray monocrystal diffraction method.
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