Syntheses, Structures, and Luminescent Properties of Two Isostructural 3D Cd II Frameworks based on Rigid‐flexible Hybrid Ligands

Two isostructural Cd II frameworks, [Cd 2 (MMA) 2 (bpy)(H 2 O) 2 ] n ( 1 ) and [Cd 2 (MMA) 2 (bpe)(H 2 O) 2 ] n ( 2 ), were synthesized solvothermally with hybrid flexible methylmalonic acid (H 2 MMA) and rigid 4,4'‐bipyridine (bpy) or trans‐1,2‐bis(4‐pyridyl)ethylene (bpe) as coligands. Single‐crystal X‐ray diffraction analyses reveal that complexes 1 and 2 display a three‐dimensional (3D) framework structure composed of 2D [Cd(MMA)] layer unit and bpy/bpe linker, and exhibit a (3,4)‐connected topological network with Schläfli symbol of {6 3 }{6 5 .8}. The solid‐state luminescent properties were studied, and 1 and 2 show a distinct emission centered at 465 and 531 nm, respectively.