Novel Cu(II), Ni(II), Zn(II), Cd(II), and Mg(II) complexes with a series of 2-arylhydrazono-1,3-dicarbonyl compounds. Synthesis, structure and spectroscopic characteristics

A series of novel metal complexes of Cu(II), Ni(II), Zn(II), Cd(II), and Mg(II) with four N-heterocyclic derivatives of 2-arylhydrazono-1,3-dicarbonyl compounds were isolated and identified by FT IR, 1H NMR, EPR, and UV–Vis spectroscopy. The crystallographic data for two organic ligands as well as Mg(II) and Ni(II) complexes were obtained. It was indicated that the organic species exist in the form of hydrazo-tautomers. The Ni complex is monomeric and is characterized by the tridentate coordination of the ligand through a deprotonated N-atom of the hydrazo-fragment and two neighboring O-atoms of the carbonyl and deprotonated hydroxy-groups. In the case of the Mg complex the polymeric structure is observed with the additional coordination through the sulfamide group of the organic specie. Formation constants of the complexes in ethanol aqueous solutions were calculated and correlated with some physical characteristics of the metal cations. Structures of yet unstudied metal complexes were proposed based on quantum-chemical modeling at the DFT/B3LYP level. © 2020

Kovalchukova O.V. 1, 2 , Anh V.T.N. 1 , Utenyshev A.N. 3, 4 , Stash A.I. 5 , Ryabov M.A. 1 , Abbas A.T.R.A.6 , Voronkova V.K.7 , Bazan L.V.7
Elsevier Ltd
  • 1 Department of General Chemistry, Peoples’ Friendship, University of Russia (RUDN University), 6. Miklukho Maklaya St., Moscow, 117198, Russian Federation
  • 2 Department of Organic Chemistry, Russian State University. AN Kosygin (Tech. Design. Art), 33, Sadovnicheskaya St., Moscow, 117997, Russian Federation
  • 3 Laboratory of Structural Chemistry, Institute of Problems of Chemical Physics of the Russian Academy of Sciences (IPCP RAS), Chernogolovka, 142432, Russian Federation
  • 4 Department of Chemistry, Sechenov First Moscow State Medical University, Trubetskaya St. 8-2, Moscow, 119991, Russian Federation
  • 5 A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences, 28 Vavilova Str., Moscow 119991, GSP-1, Russian Federation
  • 6 Department of Chemistry, Baghdad Middle Technical University, Muasker Al Rashid St., Baghdad, Iraq
  • 7 Department of Chemical Physics, Zavoisky Physical-Technical Institute, FRC Kazan Scientific Center of RAS, Kazan, 420029, Russian Federation
Ключевые слова
2-Arylhydrazono-1,3-dicarbonyl compounds; Metal complexes; Quantum chemistry; Spectroscopic characteristics; X-ray structural analysis
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