Four d10 metal coordination polymers containing isomeric thiodiphthalic ligands:: Crystal structures and luminescent properties

Two versatile ligands, 2,3,2',3'-tdpa and its isomer 2,3,3',4'-tdpa, have been introduced to construct novel metal-organic frameworks with interesting structural motifs and good function. By hydrothermoreactions with d(10) metals (Zn and Cd), four coordination polymers were obtained and characterized. 1 is a 3D framework embodying two distinct types of helical chains. 2 features a 2D lamellar structure with helices and 14-membered rings in every layer. 3 is a 3D framework bearing the (6(2).8(3).10)(6(2).8)(6.8.10) topology and has chiral layers in it. 4 shows a quasi-2D structure with 1D binuclear zinc chains and less common monocoordinated 4,4'-bipyridine ligands. All four of these coordination polymers exhibit intense blue fluorescence emissions (1 at 429 nm, 2 at 473 nm, 3 at 451 nm, and 4 at 492 nm) and may be suitable as excellent candidates of blue fluorescent materials.