Exploratory syntheses, structures, and photoluminescent properties of three lead multi-dimensional frameworks

Document Type

Article

Publication Date

6-10-2012

Abstract

Three structurally diverse Pb II coordination complexes, [Pb 3O(OH)(4-sphth)] 2(H 2O) (1), [Pb(3,5-Hdhb)]H 2O (2), and [Pb 3(4-nphth) 2(OH) 2] (3) (4-H 3sphth, 4-sulfophthalic acid; 3,5-H 2dhb, 3,5-dihydroxybenzoic acid; 4-H 2nphth, 4-nitrophthalic acid), were synthesized under hydrothermal conditions. X-ray diffraction analyses reveal that 1 is constructed from [Pb 4O 4] cubanes, based on which ladder-shaped structure is built via 4-H 3sphth bridge. This is the first Pb 4O 4-containing polymer. The Pb 2O 2 units in 2 are bridged by two parallel 3,5-HDHB ligands along the a-axis and two other parallel 3,5-HDHB ligands along the b-axis, forming a 3-D framework. For 3, the crystal structure is built up of a layer motif consisting of corner-sharing pyramidal Pb 3O units, which are linked through Pb corners to form a hexagonal unit. Each PbO 6 polyhedron is connected to three polyhedra (Pb 3O) via sharing an edge (two μ 3-oxygen atoms) and two faces (three μ 3-oxygen atoms), thus yielding an infinite 2-D Pb-O-Pb (3,6-net) honeycomb layer. The luminescence of 1-3 demonstrates that they may be good candidates for luminescent materials. © 2012 Taylor & Francis.

Publication Source (Journal or Book title)

Journal of Coordination Chemistry

First Page

1847

Last Page

1857

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