Coordination Polymers of Zn and Cd Based on Two Isomeric Azine Ligands: Synthesis, Crystal Structures, and Luminescence Properties

Coropceanu Eduard; Bourosh Pavlina; Fonari Marina

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, , COROPCEANU, Eduard, BOUROSH, Pavlina, , , FONARI, Marina. Coordination Polymers of Zn and Cd Based on Two Isomeric Azine Ligands: Synthesis, Crystal Structures, and Luminescence Properties. In: Russian Journal of Coordination Chemistry/Koordinatsionnaya Khimiya, 2019, vol. 45, pp. 11-21. ISSN -. DOI: https://doi.org/10.1134/S107032841901007X

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Russian Journal of Coordination Chemistry/Koordinatsionnaya Khimiya

Volumul 45 / 2019 / ISSN - /ISSNe 1070-3284

Coordination Polymers of Zn and Cd Based on Two Isomeric Azine Ligands: Synthesis, Crystal Structures, and Luminescence Properties

DOI:https://doi.org/10.1134/S107032841901007X

Pag. 11-21

¹², Coropceanu Eduard¹², Bourosh Pavlina²³, ³, Fonari Marina³

¹ Institute of Chemistry,
² Tiraspol State University,
³ Institute of Applied Physics

Disponibil în IBN: 1 iulie 2019

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Abstract: Metal-organic 1D coordination polymers of Zn(II) and Cd(II), [{Zn(3-Bphz)(H ₂ O) ₄ }(3-Bphz)(NO ₃ ) ₂ ] _n (I), [Zn(3-Bphz)I ₂ ] _n (II), [Cd(3-Bphz)I ₂ ] _n (III), [Cd(4-Bphz)(CH ₃ COO) ₂ (H ₂ O)] _n (IV), and [Cd(4-Bphz)(NO ₃ ) ₂ (H ₂ O) ₂ ] _n (V), containing azines of the N,N' type, 1,2-bis(pyridin-3-ylmethylene)hydrazine (3-Bphz) and 1,2-bis(pyridin-4-ylmethylene)hydrazine (4-Bphz), as bridging ligands are synthesized. The compositions and structures of the compounds are confirmed by the data of elemental analysis, IR and NMR spectroscopy, and single-crystal X-ray diffraction analysis (CIF files CCDC nos. 1812634–1812638 for I–V). Coordination polymers I–III have zigzag structures. The octahedral environment of the Zn ²⁺ ion in compound I is formed by two 3-Bphz ligands and four water molecules. The external sphere contains nitrate anions and uncoordinated 3-Bphz molecules. In isomorphous compounds II and III, the tetrahedral environment of the metal is formed by two nitrogen atoms of two bridging 3-Bphz ligands and two iodine atoms. Coordination polymers IV and V are linear. The coordination polyhedron of the Cd ²⁺ ion in compound IV is a pentagonal bipyramid, two vertices of which are occupied by the nitrogen atoms of two 4-Bphz molecules, and the equatorial plane is formed by two bidentate-chelating acetate anions and one water molecule. In compound V, the octahedral environment of the Сd ²⁺ ion is formed by two molecules of the 4-Bphz ligand, two monodentate nitrate anions, and two water molecules. All complexes are weak luminophores emitting in the blue-green spectral range.

Cuvinte-cheie
azine ligands, coordination polymers, crystal structure, Luminescence

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