Two-dimensional thallium(I) supramolecular polymer constructed from Tl⋯π interactions: A new precursor for the preparation of thallium(III) oxide with a nano-structural surface

A new two-dimensional thallium(I) supramolecular polymer, [Tl2(μ3-9-Ac)(μ4-9-Ac)(H2O)]n (1) [9-HAc = 9-anthracene carboxylic acid], has been synthesized and characterized. The single-crystal X-ray data of compound 1 shows two types of TlI ions with coordination numbers of four and five. The thallium atoms have irregular coordination spheres, containing a stereo-chemically active lone pair with η5 Tl⋯C interactions in the vacant coordination sphere of the TlI ions, thus attaining total hapticities of 9 and 10 with O5Tl1⋯C5 and O4Tl2⋯C5 environments and Tl⋯π(centroid) distances of 3.308 and 3.251 Å, respectively. The thermal stability of 1 was studied by thermo gravimetric (TG) and differential thermal analyses (DTA). Different morphologies of thallium(III) oxide with a nano-structural surface were prepared from compound 1 powders and compound 1 micro-rods. These nano-structures were characterized by X-ray powder diffraction (XRD) and scanning electron microscopy (SEM).

A new two-dimensional thallium(I) supramolecular polymer, [Tl2(μ3-9-Ac)(μ4-9-Ac)(H2O)]n (1) [9-HAc = 9-anthracene carboxylic acid], has been synthesized and characterized. The single-crystal X-ray data of compound 1 shows two types of TlI ions with the coordination number of four and five.Figure optionsDownload as PowerPoint slideHighlights
► Thallium(III) oxide with nano-structural surface was prepared from calcination process of [Tl2(μ3-9-Ac)(μ4-9-Ac)(H2O)]n (1) [9-HAc = 9-anthracene carboxylic acid]. By usage of compound 1 micro-rods, different morphology of Tl2O3 nano-structure was formed. In this compound, two types of TlI ions with O5Tl1⋯C5 and O4Tl2⋯C5 coordination sphere exists. These two η5 polyhapto interactions result in formation of two-dimensional supramolecular polymer.