Self-assembly of silver polymers based on flexible isonicotinate ligand at different pH values: Syntheses, structures and photoluminescent properties

Two interesting coordination polymers, [Ag₈(IN) ₆(NO₃)₂] 1 and [Ag(IN)(HIN)]_1/2 [Ag(IN)] 2 (HIN=isonicotinic acid) have been synthesized hydrothermally at different pH values. 1 crystallizes in the triclinic space group P-1, with a=10.987(2)Å, b=11.625(2)Å, c=17.323(4)Å, α=75.87(3) °, β=80.87(3)°, γ=76.50(3)°, V=2074.0(7)Å3 and Z=2. Compound 1 is the first example of a bilayer framework, in which both single layers are connected by the bond interactions (Ag-O) between Ag from two two-dimensional (2D) single layers generated by the A building block and O atoms from one-dimensional (1D) chain constructed by the B building block, in which coordination modes of IN were reported for the first time. 2 crystallizes in the monoclinic space group P2(1)/c, with a=8.1668(16)Å, b=19.611(4)Å, c=7.4083(15)Å, β=92.90(3)°, V=1185.0(4) and Z=4. Compound 2 exhibits a 2D plywood-like structure assembled by hydrogen bonds and weak Ag-O interactions.