title: Low pH hydrothermal synthesis and properties of lanthanide-organic frameworks with (4(10),6(5))(4(9),6(6)) topology constructed from Ln-Hbptc building blocks.
abstract: Two novel lanthanide-organic frameworks (LnOFs) with (4(10),6(5))(4(9),6(6)) topology, [Ln(Hbptc)(H(2)O)](n) (Ln = Eu(1), Gd(2); H(4)bptc = 3,3',4,4'-biphenyltetracarboxylic acid) were synthesized via the hydrothermal in situ reaction between lanthanide salts and 3,3',4,4'-biphenyltetracarboxylic dianhydride (bpta) under low pH conditions. In complexes 1 and 2, homohelix bundles with opposite chirality are assembled alternately and result in pillar-like 3D extended networks incorporated with coordinated water molecules, which show high thermal stability. The luminescence properties are illustrated by the Eu(III) complex (1) and its Gd-doped compound, which are intensive red emitters. The magnetic properties of complexes 1 and 2 are also investigated.
authors.affiliation: Department of Chemistry, Beijing Normal University, Beijing, 100875, P. R. China.
authors.forename: Danfeng
authors.initials: D
authors.lastname: Weng
authors.forename: Xiangjun
authors.initials: X
authors.lastname: Zheng
authors.forename: Licun
authors.initials: L
authors.lastname: Li
authors.forename: Wenwen
authors.initials: W
authors.lastname: Yang
authors.forename: Linpei
authors.initials: L
authors.lastname: Jin