Synthesis and Structure of New Copper(II)
Coordination Compounds with 8-Quinoline Aldehyde
Semicarbazones and Thiosemicarbazones

P. N. Bourosh^a, M. D. Revenko^b, E. F. Stratulat^b, B. Wicher^c, M. Gdaniec^c, and I. D. Korzha^b

^a Institute of Applied Physics, Academy of Science of Moldova, Kishinev, Moldova

^bMoldova State University, Kishinev, Moldova

^c Faculty of Chemistry, Adam Mickiewicz University, Poznan, Poland

e-mail: revenco@usm.md

Received August 5, 2013

Abstract—Copper(II) salts were reacted with various quinoline aldehyde chalcogensemicarbazones to yield
compounds formulated as Cu(HL)X₂ nH₂O (I: HL = quinoline aldehyde thiosemicarbazone (HL¹), X = ClO₄,
n = 2; II: HL = quinoline aldehyde 4-C₂H₅-thiosemicarbazone (HL^1a), X = NO₃, n = 0; III: HL = quinoline
aldehyde semicarbazone (HL²), X = ClO₄, n = 3 and IV: HL = quinoline aldehyde 4-Ph-semicarbazone (HL^2a),
X = NO₃, n = 1). Regardless of the reagent ratio, the products were compounds having the metal : ligand ratio
of 1 : 1, where the organic ligand was coordinated tridentate in a molecular form. Single-crystal X-ray diffrac-
tion showed that, depending on the chalcogen atom in the organic ligand (S or O), the substituent in the 4th
position (at the terminal nitrogen atom), and the specifics of the acido ligand, complexes I–IV had appreciably
differing molecular structure organizations. The structures of I and III are formed by a 1D charged coordination
polymer, anions, and water molecules and may be described by the formula
[Cu(HL)(H₂O)(ClO₄)]_n(ClO₄)_n nH₂O. Copper(II) coordination polyhedra in I and II are (4 + 2) and (4 + 1 + 1)
tetragonal bipyramids, respectively. In II and IV, the structures are monomeric and can be described as
[Cu(HL^1a)(NO₃)₂] with the metal coordination polyhedron shaped as a (4 + 1) tetragonal pyramid in II and as
[Cu(HL^2a)(H₂O)(NO₃)](NO₃) with the metal coordination polyhedron shaped as a (3 + 2) trigonal bipyramid in
IV. The structure of II is built of molecular complexes, each comprising, apart from ligand HL^1a, two mono-
dentate coordinated groups. The oxygen atom of one anion together with the NNS donor atom set of
ligand HL^1a form the base, and the oxygen atom of the other anion is in the apex of the coordination polyhedron.
In IV, the structure is ionic and built of anions and [Cu(HL^2a)(H₂O)(NO₃)]⁺ complex cations, where a cat-
ionic coordination polyhedron has a trigonal-bipyramidal configuration with organic ligand HL^2a positioned
along the long edge. The bipyramidal base is made up by the oxygen atoms of the coordinated water molecule
and monodentate nitrato group and the nitrogen atom N2 of the azomethyne group.

DOI: 10.1134/S0036023614060059

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