Competition between dicarboxylic and bipyridine ligands at Cu(II) and Zn(II) coordination
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VITIU (BOLDIŞOR), Aliona, KOROPCHANU, E., CROITOR, Lilia, BOUROSH, Pavlina. Competition between dicarboxylic and bipyridine ligands at Cu(II) and Zn(II) coordination. In: Ecological and environmental chemistry : - 2017, Ed. 6, 2-3 martie 2017, Chișinău. Chisinau, Republic of Moldova: Academy of Sciences of Moldova, 2017, Ediția 6, p. 178.
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Ecological and environmental chemistry
Ediția 6, 2017
Conferința "Ecological and environmental chemistry 2017"
6, Chișinău, Moldova, 2-3 martie 2017

Competition between dicarboxylic and bipyridine ligands at Cu(II) and Zn(II) coordination


Pag. 178-178

Vitiu (Boldişor) Aliona12, Koropchanu E.1, Croitor Lilia2, Bourosh Pavlina2
 
1 Institute of Chemistry of the Academy of Sciences of Moldova,
2 Institute of Applied Physics, Academy of Sciences of Moldova
 
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Disponibil în IBN: 18 martie 2019


Rezumat

Metal-organic frameworks are constructed by joining metal-containing units with organic linkers, using strong bonds to create open crystalline frameworks with permanent porosity. Polycarboxylates with bipyridine-like ligands are often employed as bridging ligands to construct porous compounds, due to their versatile coordination modes and high structural stability. Herein we have combined the Cu (II)/Zn (II) metal centers with two types of ligands: 1,2-benzenedicarboxylic acid (1,2-bdcH2) and 1,2-bis(4-pyridyl) ethane (bpe). As a result, novel Cu(II) AB-type salt and Zn(II) 3D coordination polymer with compositions (bpeH2)[CuCl4] I and [Zn2(1,2-bdc)2(bpe)2]n·0.25(dmf)·0.25(H2O) II were synthesized and characterized by X-ray structure determination. The organic−inorganic compound I crystallizes in triclinic P-1 space group: a=7.1316(11), b= 7.3527(8), c=8.3190(12) Å, α=67.530(12), β=70.788(14), γ=71.889(12)°. The asymmetric unit is constituted by one tetrahedral symmetrical anion [CuCl4]2- ıand symmetrical cation of (bpeH2)2+. The organic cations are linked to the complex anion by strong hydrogen bonds, N–H···Cl yielding 1D supramolecular chain. Compound II crystallizes in the centrosymmetric monoclinic space group P21/n: a = 12.4678(4), b = 17.8150(10), c = 20.6837(11) Å, β= 96.237(3)°. Each Zn (II) cation coordinates two bridging bidentate 1,2-bdc2- anions and two neutral bpe molecules. The N2O2-coordination environment surrounding of Zn (II) atom represents the tetrahedron. The extension of structural motif occurs via bridging 1,2-bdc anions and bpe ligands and affords the 3D coordination network. The porous solid II reveals the capacity to accommodate water and dmf solvents. The water molecule is held in the crystal lattices via OH···O hydrogen bonds. Biological activity properties of II are in progress.