Abstract
The syntheses and physico-chemical characteristcs of Ni(II) complexes of pyridoxal semicarbazone (PLSC) and pyridoxal thiosemicarbazone (PLTSC), obtained in the presence (
1–
3)/absence (
4) of NaN
3, viz. [Ni
2(PLSC)
2(μ
1,1-N
3)
2(N
3)
2]
·
2H
2O (
1), [Ni(PLSC–H)
2]
·
2H
2O (
2), [Ni(PLTSC–H)N
3]
·
H
2O (
3) and [Ni(PLTSC)
2](NO
3)
2
·
H
2O (
4) are described. The octahedral complexes
1,
2 and
4 are characterized also by X-ray monocrystal diffraction method.
Reaction of aqueous solutions of Ni(NO
3)
2 and pyridoxal semicarbazone (PLSC) in the presence of NaN
3 afforded two complexes, viz. green, paramagnetic binuclear octahedral [Ni
2(PLSC)
2(μ
1,1-N
3)
2(N
3)
2]
·
2H
2O (
1) and, as admixture, red, octahedral [Ni(PLSC–H)
2]
·
2H
2O (
2) complex. Under the same reaction conditions, pyridoxal thiosemicarbazone (PLTSC) gave only one diamagnetic square-planar, red complex [Ni(PLTSC–H)N
3]
·
H
2O (
3). In the absence of NaN
3, the reaction of PLTSC and Ni(NO
3)
2 yielded brown paramagnetic octahedral complex [Ni(PLTSC)
2](NO
3)
2
·
H
2O (
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.