Solvent-induced 1- and 2-D Cd(II) coordination polymers based on a bent polypyridyl ligand

Two Cd(II)-tppda (tppda = N,N,N′,N′-tetrakis(2-pyridyl)-2,6-pyridinediamine) coordination polymers have been prepared via variations of the templating solvent. The solvated complex [Cd2(tppda)(DMF)2(μ-SCN)2(SCN)2]n (1) exhibits a 1-D pseudo-helical structure, whereas the unsolvated complex [Cd2(tppda)(μ-SCN)4]n (2) features a 2-D metal-organic framework (MOF). Both are luminescent in the solid state, with emission maxima 444 and 435 nm for 1 and 2, respectively.