Three unprecedented high-connected 3D lanthanide-organic frameworks based on benzene-1,2,4,5-tetracarboxylic acid

Three unprecedented high-connected 3D lanthanide coordination polymers based on benzene-1,2,4,5-tetracarboxylic acid (H(4)bta), {[Ln(2)(bta)(1.5)(H2O)(4)]center dot 3H(2)O} (Ln = La (1) and Ce (2)) and [Pr(bta)(0.5)(H(2)bta)(0.5)(H2O)](n) (3), have been synthesized under hydrothermal conditions. Complexes land 2 show trinodal (4,4,10)-connected 3D network structures consisting of tetranuclear metal clusters bridged by bta(4-) ligands, and a chair conformation hexamer water cluster can be found within the cage enclosed by eight neighboring tetranuclear metal clusters in the two complexes. While 3 consists of 2D {Pr(bta)(0.5)}(n) layers linked by H(2)bta(2-) ligands, resulting in an unprecedented trinodal (4,6,10)-connected 3D topological network The organic ligand exhibits five kinds of coordination modes, in which one of them is reported for the first time. Moreover, the luminescent properties of 1-3 have also been investigated. (C) 2015 Elsevier B.V. All rights reserved.