Synthesis, crystal structures and photoluminescent properties of two Cd(II)/Zn(II) coordination polymers with rarely 8-/2-fold interpenetrated based on 4,4′-stilbenedicarboxylic acid and imidazole ligands

<p>Two coordination polymers, [Cd(sbdc)(bmib)]_n (<b>1</b>) and {[Zn(sbdc)(tib)]·0.5H₂O}_n (<b>2</b>) (H₂sbdc = 4,4′-stilbenedicarboxylic, bmib = 1,4-bis(2-methylimidazol-1-yl)butane, tib = 1,3,5-tris(1-imidazolyl)benzene), have been synthesized under solvothermal conditions, characterized by elemental analysis, infrared spectra, thermogravimetric analysis, and single-crystal X-ray diffraction. Single-crystal X-ray diffraction analysis reveals that <b>1</b> and <b>2</b> show 8-fold and 2-fold interpenetrating 3-D frameworks, respectively. Complexes <b>1</b> and <b>2</b> display a 4-connected (6⁶) <b>sqc6</b> and a 4-connected (4⁴·6²) <b>sql</b> topology, respectively. Photoluminescent and thermal properties of <b>1</b> and <b>2</b> have also been investigated.