title: Two novel lead(II) carboxyphosphonates with a layered and a 3D framework structure: syntheses, crystal structures, reversible dehydration/hydration, and luminescence properties.
abstract: Two novel lead(II) carboxyphosphonates with a layered and a 3D framework structure, namely, [Pb2Cl3(H2L)]·H2O (1) and [Pb2(HL)(HBTC)] (2) (H3L = H2O3PCH2-NC5H9-COOH, H3BTC = 1,3,5-benzenetricarboxylic acid), have been synthesized under hydrothermal conditions and structurally characterized. For compound 1, the interconnection of Pb(1)O2Cl3, Pb(2)O2Cl3, and CPO3 polyhedra via corner- and edge-sharing forms a 1D chain. The adjacent chains connect with each other by sharing the chloride anion, thereby generating a 2D layered structure in the ab-plane. The lattice water molecules are located between adjacent layers. Compound 2 exhibits a 3D pillared-layered structure. The Pb(1)O5, Pb(2)O5, and CPO3 polyhedra are interconnected into a 1D double chain via corner- and edge-sharing, which is further linked to adjacent chains through carboxyphosphonate ligands to form a 2D double layer structure. Neighboring double layers are bridged through the second linkers HBTC(2-), leading to a 3D pillared-layered structure with a 1D channel system along the a-axis. An interesting feature of compound 1 is the presence of the dehydration/hydration properties. It is worth noting that compound 2 can be stable up to a high temperature. The luminescent properties of compounds 1 and 2 have also been studied.
authors.affiliation: School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, PR China.
authors.forename: Wei
authors.initials: W
authors.lastname: Chu
authors.forename: Zhen-Gang
authors.initials: ZG
authors.lastname: Sun
authors.forename: Cheng-Qi
authors.initials: CQ
authors.lastname: Jiao
authors.forename: Yan-Yu
authors.initials: YY
authors.lastname: Zhu
authors.forename: Shou-Hui
authors.initials: SH
authors.lastname: Sun
authors.forename: Hui
authors.initials: H
authors.lastname: Tian
authors.forename: Ming-Jing
authors.initials: MJ
authors.lastname: Zheng