Influence of the Reaction Conditions in the Crystal Structures of Zn(II) and Ni(II) Coordination Compounds with a Dissymmetric Bis(Thiosemicarbazone) Ligand

The new ligand HMeATSM, derived from condensation of 2-3-butanedione with 4-methyl-3-thiosemicarbazide and 2,4-dimethyl-3-thiosemicarbazide, has been synthesized. Its reactivity nickel(II) zinc(II) nitrates was explored the resulting complexes were thoroughly characterized by elemental analysis, conductivity, mass spectrometry, IR, 1H 13C NMR spectroscopies their structures confirmed single-crystal X-ray diffraction. results showed that complex [Ni(MeATSM)]NO3 1 is formed under every reaction condition. In contrast, nitrate depends on temperature presence LiOH·H2O, leading to obtaining [Zn(MeATSM)(OH2)](NO3) 2 [Zn(Me2TS)2(OH2)](NO3)2 3. crystal show dissymmetric acts as a N2S2 tetradentate monoanionic ligand. structural preferences metals also determine structure complexes: whereas in square-planar environment, zinc atom prefers distorted square-base pyramid geometry imposed coordination mode planarity bis(thiosemicarbazone) 3, containing two bidentate Me2TS ligands, Zn(II) trigonal bipyramid arrangement. all complexes, ion not coordinated metal counterion.