Self-penetrating and interpenetrating 3D metal-organic frameworks constructed from 4-(4-carboxyphenoxy)-phthalic acid and N-donor auxiliary ligands

Two new interesting entangled structures, namely, [Ni-1.5(L)(bpy)(2)(H2O)(3)](n) center dot 3nH(2)O (I) and [Cd-3(L)(2)(bbi)(2)](n) center dot nH(2)O (II) (where H3L is 4-(4-carboxyphenoxy)-phthalic acid, bpy is 4,4'-bipyridine, and bbi is 1,1'-(1,4-butanediyl)bis(imidazole)) have been synthesized and characterized by elemental analysis (EA), infrared spectra (IR), X-ray powder diffraction (XRPD), solid fluorescence and thermogravimetric analysis (TGA). Single-crystal X-ray diffraction analysis revealed that complex I possesses a 3D self-penetrating framework constructed from ladder-like and fishbone-like subunits. Complex II shows a 3D framework of two-fold interpenetration assembled from trinuclear Cd(II) clusters bridged by bbi and L3- ligands. (C) 2014 Institute of Chemistry, Slovak Academy of Sciences