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Structural diversity of isothiocyanato Cd(II) and Zn(II) Girard’s T hydrazone complexes in solution and solid state: effect of H-bonding on coordination number and supramolecular assembly of Cd(II) complex in solid state

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2018
Authors
Čobeljić, Božidar
Pevec, Andrej
Stepanović, Stepan
Milenković, Milica R.
Turel, Iztok
Gruden-Pavlović, Maja
Radanović, Dušanka D.
Anđelković, Katarina K.
Article (Published version)
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Abstract
The isothiocyanato Zn(II) complex (1) and mixed isothiocyanato/thiocyanato Cd(II) complex (2) with the condensation product of 2-acetylpyridine and trimethylammoniumacetohydrazide chloride (Girard’s T reagent) (HLCl) were investigated both experimentally and theoretically. The crystal structures of both complexes showed tridentate N2O coordination of hydrazine ligand. In complex 1 square-pyramidal coordination surrounding of Zn(II) consists of deprotonated hydrazone ligand and two isothiocyanato ligands, while in octahedral Cd(II) complex ligand is coordinated without deprotonation as a positively charged species and coordination geometry is completed with two N-coordinated and one S-coordinated NCS− anions. NMR spectroscopy and molar conductivity results for Cd(II) and Zn(II) complexes indicated their instability in solution. DFT calculations were performed to explain coordination preference and stability of complexes 1 and 2 in solid state and in solution. The obtained Cd(II) complex... is the first reported mononuclear pseudohalide/halide Cd(II) complex with quinoline-/pyridine-based hydrazone ligands possessing octahedral geometry in solid state. In this complex, H-bonding has significant impact on coordination number and supramolecular assembly in solid state. © 2018, Springer Science+Business Media, LLC, part of Springer Nature.

Keywords:
DFT calculations / Hydrazone ligand / X-ray / Zn(II) and Cd(II) complexes
Source:
Structural Chemistry, 2018, 29, 6, 1797-1806
Projects:
  • Interactions of natural products, their derivatives and coordination compounds with proteins and nucleic acids (RS-172055)
  • Slovenian Research Agency (P-0175)
Note:
  • Supplementary material: http://cherry.chem.bg.ac.rs/handle/123456789/3305

DOI: 10.1007/s11224-018-1155-8

ISSN: 1040-0400

WoS: 000451767200020

Scopus: 2-s2.0-85050543071
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URI
http://cherry.chem.bg.ac.rs/handle/123456789/337
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