Hydrothermal Synthesis and Characterization of a Novel Lead(II) Inorganic-Organic Hybrid Framework Based on a Highly Flexible 2,2′-Thiodiacetic Acid Ligand

Abstract

Under the hydrothermal conditions, based on a highly flexible H₂L (2,2′-thiodiacetic acid) ligand and corresponding lead(II) salts, a novel lead(II) inorganic-organic hybrid framework {Pb₃(μ₈-L)₂(μ₂-Br)₂}_n (1) has been isolated. In 1, 1D infinite Pb-O-Pb and Pb-Br-Pb connectivity can be observed, which are interlinked forming a novel 2D inorganic-organic framework with I²O⁰type. The six-coordinated geometry of Pb1 in the hemidirected geometry and eight-coordinated geometry of Pb2 in the holodirected geometry in 1 also can be observed. TG analysis and solid-state fluorescent spectrum of 1 have also been investigated. The variable lead(II) geometries and coordination numbers together with flexible coordination modes of deprotonated 2,2′-thiodiacetate ligand also reveal great potential in the rational design and deliberate construction of those novel inorganic-organic hybrid materials.

Supplementary material is available for this article. Go to the publisher's online edition of Synthesis and Reactivity in Inorganic, Metal-Organic, and Nano-Metal Chemistry to view the supplemental file.]

Keywords:

• fluorescence
• inorganic-organic hybrid framework
• Pb(II)

Acknowledgments

This present work was supported financially by Tianjin Educational Committee (20090504 and 20110311).