New coordination polymers from 1D chain, 2D layer to 3D framework constructed from 1,2-phenylenediacetic acid and 1,3-bis(4-pyridyl)propane flexible ligands

Article abstract of DOI:10.1016/j.jssc.2011.04.002

The hydrothermal reactions of Cd, Zn, or Cu(II) acetate salts with H ₂PHDA and BPP flexible ligands afford three new coordination polymers, including [Cd(PHDA)(BPP)(H₂O)]_n (1), [Zn(PHDA)(BPP)]_n (2), and [Cu₂(PHDA)₂(BPP)] _n (3) (H₂PHDA=1,2-phenylenediacetic acid, BPP=1,3-bis(4-pyridyl)propane). The single-crystal X-ray diffractions reveal that all three complexes feature various metal carboxylate subunits extended further by the BPP ligands to form a diverse range of structures, displaying a remarked structural sensitivity to metal(II) cation. Complex 1 containing PHDA-bridged binuclear cadmium generates 1D double-stranded chain, complex 2 results in 2D→2D interpenetrated (4,4) grids, and complex 3 displays a 3D self-penetrated framework with 4⁸6⁶8 rob topology. In addition, fluorescent analyses show that both 1 and 2 exhibit intense blue-violet photoluminescence in the solid state.