Synthesis and characterization of Co(II) AND Ni(II) coordination complexes with 4,4ʹ-diaminodiphenylmethane
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PLIUSNINA, M., COCIU, Valeriu, BENEA, E., CROITOR, Lilia, CHIŞCA, Diana. Synthesis and characterization of Co(II) AND Ni(II) coordination complexes with 4,4ʹ-diaminodiphenylmethane. In: Materials Science and Condensed Matter Physics, Ed. 9, 25-28 septembrie 2018, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2018, Ediția 9, p. 120.
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Materials Science and Condensed Matter Physics
Ediția 9, 2018
Conferința "International Conference on Materials Science and Condensed Matter Physics"
9, Chișinău, Moldova, 25-28 septembrie 2018

Synthesis and characterization of Co(II) AND Ni(II) coordination complexes with 4,4ʹ-diaminodiphenylmethane

CZU: 546

Pag. 120-120

Pliusnina M.1, Cociu Valeriu1, Benea E.1, Croitor Lilia2, Chişca Diana12
 
1 Tiraspol State University,
2 Institute of Applied Physics
 
Disponibil în IBN: 17 ianuarie 2019


Rezumat

Molecular self-assembly has emerged as an attractive approach to the fabrication of the new materials, and considerable effort has been made towards the supramolecular networks assembled hydrogen bonds or other molecular interactions [1]. In recent decades, there has been great interest in the study of metal-organic supramolecular frameworks owing to their intriguing structural diversity and potential utility in fields such as catalysis, nonlinear optics, molecular magnetic materials, electrical conductivity and molecular recognition [2-5]. The assembly of these complexes strongly depends on the selection of both the metallic centers and the ligands. Ligands containing pyridine and other aromatic base fragments as donors have been widely used and were shown to produce relatively stable networks, while aromatic bridging ligands with NH2 donor groups are less frequently employed. The bent ditopic ligand, 4,4ʹ-diaminodiphenylmethane (dadpm), was previously used to produce few monomers and cyclic oligomers [6] and some polymeric species, with [7] or without [8] the additional involvement of bridging anions.  Herein we report on the self-assembly reactions of dadpm with Co(CH3COO)2 and Ni(ClO4)2 in C2H5OH/dmf and the structural characterizations of two monomers, [Co(dadpm)2 (CH3COO)2(H2O)2] (1), [Ni(dadpm)3(dmf) (H2O)2][(ClO4)2·(dadpm)·(H2O)] (2). Compounds 1 and 2 belong to the same monoclinic crystal system, but differ in space groups, C2/c for 1 and P21/n for 2. The X-ray analysis reveals that in 1 Co(II) ion adopts a slightly distorted octahedral geometry with the N2O4-set of donor atoms going from two dadpm molecules in axial positions, two water molecules and two acetate anions coordinated monodentate occupy the equatorial positions (Fig.1a). Each dadpm ligand links the complexes through hydrogen-bond interaction between coordinated water molecules and the N atoms of amino-ligands, forming one-dimensional double array. Complex 2 contains a six-coordinated Ni(II) center which is coordinated by N atoms from three different dadpm ligands, O atoms from two water and one dmf molecules, forming a distorted N3O3 octahedral coordination of Ni (Fig.1b). In the complex crystals are assembled via hydrogen-bond interaction between coordinated water molecules and the amine ligands of adjacent Ni atoms, external dadpm molecule, water and ClO4- anion.