Influence of the Reaction Conditions in the Crystal Structures of Zn(II) and Ni(II) Coordination Compounds with a Dissymmetric Bis(Thiosemicarbazone) Ligand
Entity
UAM. Departamento de Química InorgánicaPublisher
MDPIDate
2022-02-22Citation
10.3390/cryst12030310
Crystals 12.3 (2022): 310
ISSN
2073-4352 (online)DOI
10.3390/cryst12030310Funded by
This research was funded by MICINN, Instituto de Salud Carlos III, grant number PS09/00963Editor's Version
https://doi.org/10.3390/cryst12030310Subjects
Nickel complexes; Thiosemicarbazones; X-ray diffraction; Zinc complexes; QuímicaRights
© 2022 by the authorsAbstract
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 with nickel(II) and zinc(II) nitrates was explored and the resulting complexes were thoroughly character-ized by elemental analysis, conductivity, mass spectrometry, IR,1H and13C NMR spectroscopies and their structures were confirmed by single-crystal X-ray diffraction. The results showed that the complex [Ni(MeATSM)]NO3 1 is formed under every reaction condition. In contrast, the reaction with zinc(II) nitrate depends on the temperature and the presence of LiOH.H2O, leading to the obtaining of complexes [Zn(MeATSM)(OH2)](NO3) 2 and [Zn(Me2TS)2 (OH2)](NO3)2 3. The crystal structures of complexes 1 and 2 show that the dissymmetric ligand acts as a N2S2 tetradentate monoanionic ligand. The structural preferences of the metals also determine the structure of the complexes: whereas nickel(II) is in a square-planar environment, the zinc atom prefers a distorted square-base pyramid geometry imposed by the coordination mode and the planarity of the bis(thiosemicarbazone) ligand. In contrast, in complex 3, containing two bidentate Me2TS ligands, the Zn(II) is in a trigonal bipyra-mid arrangement. In all the complexes, the nitrate ion is not coordinated to the metal and acts as a counterion
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Google Scholar:Alonso, Luis Enrique
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Burón, Rodrigo
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López Torres, Elena Sofía
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Mendiola Martín, María Antonia
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