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Journal of the Chilean Chemical Society

versão On-line ISSN 0717-9707

Resumo

ATRIA, Ana María et al. μ-BENZENE-1,2,4,5-TETRACARBOXYLATO-κ2O1:O4)BIS-[AQUA-BIS-2-(AMINOMETHYL) PYRIDINE-κ2N,N’) NICKEL (II)] DECAHYDRATE: STRUCTURE AND MAGNETIC PROPERTIES. J. Chil. Chem. Soc. [online]. 2019, vol.64, n.2, pp.4484-4487. ISSN 0717-9707.  http://dx.doi.org/10.4067/S0717-97072019000204484.

μ-Benzene-1,2,4,5-tetracarboxylato-κ2O1:O4)bis-[aqua-bis-2-(aminomethyl) pyridine-κ2N,N’) nickel (II)] decahydrate, [Ni2(amp)4(btc)(H2O)2]10H2O has been synthesized and its crystal structure determined by X-ray diffraction. The complex crystallizes in the Monoclinic space group P21/n with cell dimensions a= 11.0102 (10) Å, b= 21.5416 (19) Å, c= 11.0445 (10) Å and β= 118.753 (1)°, and two formula units per cell (Z= 2, Z’= 0.5).

The structure consists of centrosymmetric dimeric units in which the benzene tetracarboxylate anions (btc) bridge the symmetry-related nickel (II) cations, two bidentate chelating molecules of 2-(aminomethyl) pyridine and a terminal aqua ligand completing the six-fold coordination at each metal. These dimers link to each other via H-bonding to form chains parallel to [100], while the water solvates form a strongly bound 2D network parallel to (100), made up by small (R44(8)) and large (R2020(40)) rings, the latter ones “pierced” by the chains of dimmers, with a profuse H-bonding interconnection between both substructures.

Magnetic susceptibility measurements as a function of temperature disclose weak interdimeric exchange interactions. Fitting of these data to a dimeric model yields J= −3.5 cm-1 and g= 2.13.

Palavras-chave : crystal structure; nickel complex; magnetism.

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