Ligation properties of 2-acetyl-2-thiazoline semicarbazone (ATsc): Isolation, spectroscopic and X-ray study of ATsc and its Cu(II) and Ni(II) complexes

Six-coordinated nickel(II) complexes with benzothiadiazole Schiff-base ligands: synthesis, crystal structure, magnetic and HFEPR study

Two new nickel(II) complexes, namely Ni(L1)2 (1) and Ni(L2)2·CH2Cl2(2) were obtained by reacting nickel(II) acetate tetrahydrate with the benzothiadiazole Schiff base ligands HL1 = 2-[4-(2,1,3-benzothiadiazole)imino]methyl-phenol or HL2 = 2-[(2,1,3-benzothiadiazol-4-ylimino)methyl]-6-methoxyphenol in the presence of Et3N. The tridentate NNO chelate ligands induce a distorted octahedral environment around the nickel(II) ions. Single crystal X-ray diffraction analysis reveals elongated Ni-N bonds with the nitrogen atom of the benzothiadiazole ring in both complexes. Intermolecular hydrogen bonds and π-π stacking interactions create two-dimensional and three-dimensional supramolecular arrays, respectively, for complexes 1 and 2. Magnetic susceptibility and high-field electron paramagnetic resonance measurements show the presence of significant magnetic anisotropy, with an axial distortion parameter D of -8--10 cm-1.

{4-Phenyl-1-[1-(1,3-thia-zol-2-yl)ethyl-idene]-thio-semicarbazidato}{4-phenyl-1-[1-(1,3-thia-zol-2-yl)ethylidene]-thio-semi-carbazide}nickel(II) chloride mono-hydrate

In the title compound, [Ni(C(12)H(11)N(4)S(2))(C(12)H(12)N(4)S(2))]Cl·H(2)O, the Ni(II) ion is chelated by two 2-acetyl-thia-zole-3-phenyl-thio-semicarbazone ligands, forming a distorted octa-hedral complex. The metal ion is coordinated via the thia-zole nitro-gen, imine nitro-gen and thione sulfur atoms from each thio-semicarbazone ligand, and two coordinating units lie almost perpendicular to each other give dihedral angle = 81.89 (1)°]. One thio-semicarbazone unit is found to bind a chloride anion through two hydrogen bonds, while the other is linked with the disordered crystal water molecule. Two mol-ecules are connected to each other through an inter-molecular N-H⋯S inter-action, forming a centrosymmetric dimer. Dimers are linked into sheets by π-π stacking of two phenyl rings [shortest C⋯C distance = 4.041 (3) Å].