Abstract
AbstractSalicylaldehyde S‐methylthiosemicarbazone (H2L) in the presence of ClO4– forms with NiII the paramagnetic octahedral bis(ligand) chelate complexes while in the presence of NCS−, CH3COO−, Py and γ‐Pic it gives diamagnetic square planar mono(ligand) chelate complexes. In the paramagnetic complexes H2L is coordinated as a neutral molecule (H2L) and monoanion (HL−), and in diamagnetic ones only as a monoanion, except the complex obtained in the presence of CH3COO−, where it is coordinated as a dianion (L2−). The last form of the ligand is the result of deprotonation, besides OH‐, the NH2‐group. The complexes have been characterized by elemental analysis, magnetic measurements, i.r. and diffuse‐reflection spectra, molar conductivity and TG analysis.
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