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SM ISO690:2012 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 | |||||
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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. |
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