Two metal-organic frameworks with different configurations constructed from a flexible tripodal triaromatic acid

摘要

Two metal-organic frameworks [Ce-2(L)(2)(DMF)(4)] (1), and [Ni-3(HL2-)(4)(bpe)(3)(H2O)(4)]center dot[H2N(CH3)(2)(+)](2)(DMF)(6)(H2O)(8) (2) (H3L = 4,4',4"-{[(2,4,6-trimethylbenzene-1,3,5-triyl)tris-(methylene)] tris(oxy)}tribenzoic acid, bpe = trans-4,4'-bipyridylethylene) have been solvothermally synthesized from a flexible tripodal ligand. Single-crystal X-ray diffraction shows that compound I features a 3,6 connected double-layer network which is further connected by weak pi-pi interactions between benzene rings to form a 3D porous network. Compound 2 exhibits an unprecedented (4,5)-connected (3(3).4(2).5.6(2).7(2))(2)(6.8(4),10) topology based on zigzag chains and straight chains. In addition, thermal stabilities and luminescent properties of 1 and 2 were investigated in the solid state. (C) 2016 Elsevier B.V. All rights reserved.