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µ-Benzene-1,2,4,5-tetracarboxylato-κ 2 O 1 :O 4 )bis[aquabis-2-(aminomethyl) pyridine-κ 2 N,N') nickel (II)] decahydrate, [Ni 2 ( amp ) 4 ( btc )(H 2 O) 2 ].10H 2 O has been synthesized and its crystal structure determined by X-ray diffraction. The complex crystallizes in the Monoclinic space group P 2 1 / n with cell dimensions a= 11.0102 (10) A, b= 21.5416 (19) A, c= 11.0445 (10) A and s= 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 (R 4 4 (8) ) and large (R 20 20 (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.

journal of the chilean chemical society

&amp;#956;-BENZENE-1,2,4,5-TETRACARBOXYLATO-&amp;#954;2O1:O4)BIS-[AQUA-BIS-2-(AMINOMETHYL) PYRIDINE-&amp;#954;2N,N&amp;#8217;) NICKEL (II)] DECAHYDRATE: STRUCTURE AND MAGNETIC PROPERTIES