Synthesis and characterization of diazine-ring containing hydrazones and their Zn(II) complexes

Two new zinc(II) coordination compounds have been synthesized by the reaction of diazine-ring containing Schiff bases di(2-pyridyl) ketone phthalazine-1-hydrazone (HzDPK) and di(2-pyridyl) ketone 3-chloropyridazine-6-hydrazone (HpDPK) with zinc(II) salts in acetonitrile in the presence of triethylam...

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Bibliographic Details
Published in:Journal of thermal analysis and calorimetry 2018-07, Vol.133 (1), p.443-452
Main Authors: Magyari, József, Barta Holló, Berta, Rodić, Marko V., Szilágyi, Imre Miklós, Mészáros Szécsényi, Katalin
Format: Article
Language:English
Subjects:
Acetonitrile
Analytical Chemistry
Atomic structure
Chemical synthesis
Chemistry
Chemistry and Materials Science
Coordination compounds
Crystal structure
Diffusion rate
Finishes
Hydrazones
Imines
Inorganic Chemistry
Ligands
Measurement Science and Instrumentation
Molecular chains
Physical Chemistry
Polymer Sciences
Single crystals
Structural analysis
Thermal decomposition
Thermodynamic properties
Triethylamine
Zinc compounds
Zinc coordination
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Summary:Two new zinc(II) coordination compounds have been synthesized by the reaction of diazine-ring containing Schiff bases di(2-pyridyl) ketone phthalazine-1-hydrazone (HzDPK) and di(2-pyridyl) ketone 3-chloropyridazine-6-hydrazone (HpDPK) with zinc(II) salts in acetonitrile in the presence of triethylamine. The crystal and molecular structures of the complexes and that of the ligand HpDPK were determined by single-crystal X-ray structure analysis. In both complexes, zinc atoms are situated in distorted octahedral environments, formed by two meridionally coordinated NNN tridentate, mono-deprotonated ligands. Since the applicability of the coordination compounds depends on their thermal properties, the thermal decomposition of the ligands and their complexes was followed by simultaneous TG–DSC measurements. The desolvation process of the complexes is rather slow as a consequence of a restricted diffusion through the lattice and finishes ~ 200 °C. The desolvated compounds are stable up to 340 °C. In order to follow the solvent evaporation and to have a better insight into the decomposition mechanism of the compounds coupled TG–MS measurements were carried out.
ISSN:1388-6150
1588-2926
DOI:10.1007/s10973-017-6908-x