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The simultaneous use of 2-pyridyl oximes (pyridine-2 amidoxime, H 2 pyaox; 2-methyl pyridyl ketoxime, Hmpko) and 1,3,5-benzenetricarboxylic acid (H 3 btc) provided access to five new compounds, namely [Zn(H 2 btc) 2 (H 2 pyaox) 2 ]•2H 2 O ( 1 •2H 2 O), [Zn(Hbtc)(H 2 pyaox) 2 ] n ( 2 ), [Cu(Hbtc)(H 2 pyaox)] n ( 3 ), [Cu(Hbtc)(HmpKo)] n ( 4 ) and [Cu 2 (Hbtc) 2 (Hmpko) 2 (H 2 O) 2 ]•4H 2 O ( 5 •4H 2 O). Among them, 3 is the first example of a metal-organic framework (MOF) containing H 2 pyaox. Its framework can be described as a 3-c uninodal net of hcb topology with the layers being parallel to the (1,0,1) plane. Furthermore, 3 is the third reported MOF based on a 2-pyridyl oxime in general. 2 and 4 are new members of a small family of coordination polymers containing an oximic ligand. 1-5 form 3D networks through strong intermolecular interactions. Dc magnetic susceptibility studies were carried out in a crystalline sample of 3 and revealed the presence of weak exchange interactions between the metal centres; the experimental data were fitted to a theoretical model with the fitting parameters being J = -0.16(1) cm -1 and g = 2.085(1). The isotropic g value was also confirmed by electronic paramagnetic resonance (EPR) spectroscopy. Reactivity studies were performed for 3 in the presence of metal ions; the reaction progress was studied and discussed for Fe(NO 3 ) 3 by the use of several characterization techniques, including single crystal X-ray crystallography and IR spectroscopy.

ZnII and CuII-Based Coordination Polymers and Metal Organic Frameworks by the of Use of 2-Pyridyl Oximes and 1,3,5-Benzenetricarboxylic Acid