Anion-Induced Structures and Luminescent Properties of Chiral Lanthanide-Organic Frameworks Assembled by an Achiral Tripodal Ligand

To confirm how different anions influence supramolecular self-assembly of lanthanide organic frameworks (LnOFs) as well as their luminescent properties, a new flexible achiral tripodal ligand, 1,1,1-tris-{[(2'-benzylaminoformyl)phenoxyl]methyl} ethane (L) and the LnOFs {[EuL(NO3)(3)]center dot 1.5CHCl(3)} and [EuL(pic)(3)](n) have been designed and assembled. In the two LnOFs, {[EuL(NO3)(3)]center dot 1.5CHCl(3)}(n) demonstrates an unprecedented chiral noninterpenetrated two-dimensional (2D) honeycomblike (6,3) (hcb, Schlafli symbol 6(3), vertex symbol 6 center dot 6 center dot 6) topological network, and [EuL(pic)(3)] confirms an unusual chiral LnOF with three-dimensional (3D) (10,3)-a (srs, SrSi2, Schlafli symbol 10(3), vertex symbol 10(2)center dot 10(4)center dot 10(4)) topological framework. Also the anion-induced structures and energy transfer processes in the luminescence behavior of the two LnOFs were discussed in detail.