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

To confirm how different anions influence sup-ramolecular 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]·1.5CHCl3}n and [EuL(pic)3]n have been designed and assembled. In the two LnOFs, {[EuL(NO3)3]·1.5CHCl3}n demonstrates an unprecedented chiral noninterpenetrated two-dimensional (2D) honeycomblike (6,3) (hcb, Schläfli symbol 63, vertex symbol 6·6·6) topological network, and [EuL(pic)3]n confirms an unusual chiral LnOF with three-dimensional (3D) (10,3)-a (srs, SrSi2, Schläfli symbol 103, vertex symbol 102·104·104) topological framework. Also the anion-induced structures and energy transfer processes in the luminescence behavior of the two LnOFs were discussed in detail.