Synthesis of new bridging ligands and their Co(III) binuclear coordination compounds
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2023-08-09 07:33
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KOROPCHANU, E., CODREANU, Sergiu, BULHAK, Ion, BOUROSH, Pavlina. Synthesis of new bridging ligands and their Co(III) binuclear coordination compounds. In: The International Conference dedicated to the 55th anniversary from the foundation of the Institute of Chemistry of the Academy of Sciences of Moldova, 28-30 mai 2014, Chișinău. Chișinău, Republica Moldova: Institutul de Chimie al AȘM, 2014, p. 65.
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The International Conference dedicated to the 55th anniversary from the foundation of the Institute of Chemistry of the Academy of Sciences of Moldova 2014
Conferința "The International Conference dedicated to the 55th anniversary from the foundation of the Institute of Chemistry of the Academy of Sciences of Moldova"
Chișinău, Moldova, 28-30 mai 2014

Synthesis of new bridging ligands and their Co(III) binuclear coordination compounds


Pag. 65-65

Koropchanu E.1, Codreanu Sergiu2, Bulhak Ion1, Bourosh Pavlina3
 
1 Institute of Chemistry of the Academy of Sciences of Moldova,
2 Tiraspol State University,
3 Institute of Applied Physics, Academy of Sciences of Moldova
 
Disponibil în IBN: 22 ianuarie 2019


Rezumat

Using the condensation reaction of 4-pyridinaldehyde with hydrazine (L1) and carbohydrazide (L2) the synthesis of dipyridine ligands has been carried out. The reaction of [Co(DH)2(H2O)Cl] with both ligands in molar ratio 1:2 has led to two binuclear Co(II) coordination compounds with the composition [Co2(DH)4(L1)Cl2] (1) and [Co2(DH)4(L2)Cl2] (2), where DH is the dimethylglyoxime monoanion. Both coordination compounds are characterized by X-ray diffraction method. In binuclear units in 1 and 2, each Co(III) cations are hexacoordinated by four nitrogen atoms of bidentate monodeprotonated DH- in basal plane and nitrogen atom by bidentate L1 or L2 ligand and chlorine atom in the apical sites (Figs. 1 and 2). The neutral L1 and L2 act as bridging ligands in the Co(III) complexes. The DH- residues coordinates in his typical mode through oxime nitrogen atoms, thus leading to the formation of a five-membered chelate ring around the metal core. Two dioxime residues are combined through intramolecular O–H···O hydrogen bonds (O···O 2.50(1) and 2.51(1) Å in 1, 2.47(1), 2.50(1), 2.50(1) and 2.49(1) Å, in 2) in a pseudomacrocyclic system.