Synthesis and magnetic properties of two cobalt-coordination polymers containing 1,10-phenanthroline and alkyl dicarboxylates ligands

The structural and magnetic properties of two novel one-dimensional coordination compounds were investigated in the solid crystalline state to support studies of their potential as multifunctional materials. The new compounds are based on Co(II) and are named {[Co4(glu)4(phen)4(H2O)2]·H2O}n (1) and {[Co2(azl)2(phen)2(H2O)2]}n (2) (glu = glutarate, azl = azelate, and phen = 1,10-phenanthroline). Compound (2) is the first crystal structure of a cobalt-based coordination polymer with the mixed ligands azl and phen. The crystal structures of the compounds were determined by single crystal X-ray diffraction; where the influence of the alkyl dicarboxylates on the formation of a 1D looped or a single chain coordination polymer was observed. The FT-IR analysis confirms the coordination modes adopted by the mixed ligands azl and phen and the thermal analysis suggests some thermal stability up to 150-200 °C. Supramolecular analysis suggests an important role of the non-conventional C(sp2)-H···O hydrogen bond patterns in the crystals. Finally, weak antiferromagnetic interactions were observed in both complexes.