Crystal Structures and Fluorescent Properties of Two Distinct 2D Ag(I)/Cd(II) Coordination Polymers Based on Isonicotinic Acid Derivative and Dipyridyl Coligand

Two novel coordination polymers obtained by hydrothermal reaction of Ag(I) nitrate and Cd(II) acetate salts with 3,5-dichloroisonicotinic acid and 1,3-bis(4-pyridyl)propane flexible ligand have been synthesized and characterized by single crystal X-ray diffraction (CIF files nos. 2082469 (I) and 2082471 (II)), elemental analyses, thermogravimetric analyses, powder X-ray diffractions and fluorescent spectra, formulated as {[Ag(Bpp)](Dcia)}(n) (I) and [Cd(Dcia)(2)(Bpp)(2)](n) (II) (HDcia = 3,5-dichloroisonicotinic acid, Bpp = 1,3-bis(4-pyridyl)propane). The single-crystal X-ray diffractions reveal that two complexes show different 2D {6(3)} hcb topological nets and (4,4) grid layers displaying remarked structural sensitivity to metal cation. Among them, complex I displays 2D unusual cationic layer developed by T-shaped Bpp-bridging Ag-Ag building units. Complex II exhibits 2D grid layer jointed by Dcia ligand with dangling Bpp ligand, which further interlinked into 3D supramolecular architecture by pi-pi interactions. In addition, luminescent properties of both complexes are also systematically investigated.