Synthesis and characterization of a new anionic zinc-adeninate metal-organic framework, [Zn-3(ad)(BTC)(2)center dot(Me2NH2), 5.75 DMF, 0.25 H2O]

Abstract

A new anionic zinc-adeninate metal-organic framework, [Zn-3(ad)(BTC)(2)center dot(Me2NH2), 5.75DMF, 0.25H(2)O] (ad = adeninate; BTC = benzene tricarboxylate; DMF = dimethylformamide), was synthesized via solvothermal reaction at 403 K for 24 h between adenine, zinc acetate dehydrate, and benzene tricarboxylic acid in DMF. The single-crystal structure of the framework was determined by single-crystal X-ray diffraction techniques in the monoclinic space group P2(1)/n and was refined to the final error indices R (1)/wR (2) = 0.0663/0.1714 for I > 2sigma(I). The coordination of adenine and BTC expands the structure in different directions, resulting in a three dimensional structure. This framework contains a pore with the size ca. 6.6 x 3.9 . The chemical stability, thermal stability, and cation-exchange characteristics were investigated by powder XRD, TGA, EDX, H-1 NMR, and EA.