Synthesis, characterization and dielectric properties of porous hydrogen-bonded organic framework of pyridine-2,6-dicarboxylic acid with 4-methoxyaniline and its Bi(III) complex

•Bismuth(III) complex of a H-bonded ion-pair compound is synthesized.•The compounds were characterised by spectral and single crystal XRD technique.•Thermal stability of compounds was studied by TG-DTG analysis.•The compounds were tested for dielectric property.•Band gap of two compounds were calculated from absorbance data. Pyridine-2,6-dicarboxylic acid (H2PDA) on treating with 4-methoxyaniline (MA) results in the formation of a 1:1 proton transfer compound, methoxybenzene-4-ammoniumpyridine-2,6-dicarbocylate, (HMA+)(HPDA−), which is a hydrogen bonded supra-molecular framework. Reaction between H2PDA, MA and bismuth(III)nitrate penta-hydrate in 2:1:1 ratio results in the formation of a proton transfer complex, (HMA)2[Bi2(PDA)4.2H2O].4H2O. Both compounds have been characterized on the basis of elemental analysis, FT-IR, UV-Visible, 1H, and 13C NMR and single crystal X-ray diffraction analysis. According to XRD studies (HMA+)(HPDA−) crystallizes with tetragonal crystal system in P41 space group and (HMA)2[Bi2(PDA)4.2H2O].4H2O with monoclinic P21/c space group. Thermal property of compounds was established via TG-DTG analysis and opto electric property by dielectric studies.