Syntheses, characterization, and magnetic properties of novel divalent Co/Ni coordination polymers based on a V-shaped pyridine ligand and dicarboxylate acids?

RSC Advances Pub Date: 2015-07-22 DOI: 10.1039/C5RA10805E

Abstract

Solvothermal reactions of 3,5-bis(4-pyridyl)-pyridine (BPYPY) with 1,4-benzenedicarboxylate (1,4-bdc) and trans-1,4-cyclohexanedicarboxylic acid (trans-chdc) in the presence of Co(II) and Ni(II) salts in DMF/H2O or DMA/CH3CN/H2O produced three new compounds, namely, {[Co3(BPYPY)2(1,4-bdc)3(H2O)6]}n (1), {[Ni3(BPYPY)2(1,4-bdc)3(H2O)6]}n (2), {[Co(BPYPY)(trans-chdc)0.5(NO3)]·(H2O)}n (3). These compounds were characterized by elemental analysis, IR spectroscopy, and X-ray single-crystal diffraction. Compounds 1 and 2 are isomorphous and present 3,4-connected 3-fold interpenetrating tfz network with a point symbol of {63}2{64·8·10}3. Compound 3 exists binuclear Co clusters which are linked by BPYPY and trans-chdc to generate a 4-connected cds network with the point symbol of {65·8} and displays antiferromagnetic characteristics. In addition, the thermal stabilities of these new compounds have also been discussed in detail.

Graphical abstract: Syntheses, characterization, and magnetic properties of novel divalent Co/Ni coordination polymers based on a V-shaped pyridine ligand and dicarboxylate acids
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