Three new coordination polymers based on 4-oxo-1(4H)quinolineacetate: Synthesis, structures and luminescent properties

Abstract Reactions of 4-oxo-1(4H)-quinolineacetic acid (Hoqa) and varied metal salts of Zn(II), Cd(II) and Ag(I) resulted in the formation of three new coordination polymers, namely, [Zn(oqa) 2 ]·H 2 O ( 1 ), [Cd(bpy)(oqa) 2 (H 2 O) 2 ]·4H 2 O ( 2 ) and [Ag(bpy)(oqa)]·2H 2 O ( 3 ) (bpy = 4,4′-bipyridine). Complex 1 has a three-dimensional (3D) polymeric network with diamondoid topology; compounds 2 – 3 exhibit one-dimensional (1D) chain structure characteristics, which are further assembled through π–π stacking attractions and hydrogen bonds, forming the 3D supramolecular frameworks. In addition, the solid-state luminescent properties of the ligand Hoqa and complexes 1 – 2 have been investigated at room temperature.