Zinc(II) complexes with thiadiazole derivatives-1,3,4

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Abstract

Zn(II) complexes of the composition [ZnLn2X2] and [ZnLn3(NO3)2] were synthesized, where n = 1, 2; X=Cl, Br, I; L1=2-aminothiadiazole-1,3,4, L2=2-amino-5-methylthiadiazole-1,3,4. The obtained complexes were studied by elemental analysis methods, IR and 1H NMR spectroscopy. The structure of the [ZnL22Br2] complex was determined by the RSA method (CIF file CCDC No. 2251742). The ligand molecules of 2-amino-5-R-thiadiazoles-1,3,4 (R = –H, –CH3) are coordinated monodentately by an endocyclic nitrogen atom located in the α-position to the amino group. The polyhedron of the central atom of halide complexes is a slightly distorted tetrahedron, in the coordination sphere of which two halide atoms and two endocyclic nitrogen atoms are located. During complexation in the spectrum of the solution of the [ZnL22Br2] complex, coordinated L2 ligands undergo amino-imine tautomerization into a heterocyclic amine with a nitrogen atom in a heterocycle. The polyhedron of the central atom for nitrate complexes is a slightly distorted trigonal bipyramide, in the coordination sphere of which three nitrogen atoms of ligands are located in the equatorial plane and two oxygen atoms of two nitrate anions in the axial position.

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About the authors

K. Sh. Khusenov

Navoi State University of Mining and Technologies

Author for correspondence.
Email: kahramon.husenov71@gmail.com
ORCID iD: 0000-0003-2849-8229
Uzbekistan, Navoi, 210100

B. B. Umarov

Bukhara State University

Email: kahramon.husenov71@gmail.com
ORCID iD: 0000-0002-0479-3090
Uzbekistan, Bukhara, 200117

K. K. Turgunov

Yunusov Institute of the Chemistry of Plant Substances, Academy of Sciences of the Ripublic of Uzbekistan; Turin Polytechnic University in Tashkent

Email: kambarali@mail.ru
ORCID iD: 0000-0001-5741-6347
Uzbekistan, Tashkent, 100170; Tashkent, 100095

O. Zh. Bakhranova

Navoi State University of Mining and Technologies

Email: kahramon.husenov71@gmail.com
Uzbekistan, Navoi, 210100

T. B. Aliev

Navoi State University of Mining and Technologies

Email: kahramon.husenov71@gmail.com
Uzbekistan, Navoi, 210100

B. T. Ibragimov

Institute of Bioorganic Chemistry of the Academy of Sciences of Uzbekistan

Email: kahramon.husenov71@gmail.com
ORCID iD: 0000-0002-9700-6227
Uzbekistan, Tashkent, 100125

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Supplementary files

Supplementary Files
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1. JATS XML
2. Fig. 1. 1H NMR spectra of ligand L1 (a) and its complex II (b), 400 MHz, solvent – DMSO-d6 + CCl4, 298 K.

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3. Fig. 2. 1H NMR spectra of the L2 ligand (a) and its complexes VI (b) and IV (c), 400 MHz, solvent DMSO-d6 + CCl4, 298 K.

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4. Fig. 3. Crystal structure of the complex compound [ZnL22Br2]. Intramolecular hydrogen bonds are shown. Thermal ellipsoids are shown with a probability of 50%.

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5. Fig. 4. Projection of the crystal packing of [Zn L22Br2] molecules along the c axis. Coordination polyhedra ZnN2Br2 are shown.

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6. Scheme 1.

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7. Scheme 2.

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