Synthesis and characterization of four new thallium(i) tetrazole supramolecular compounds with various secondary interactions; new precursors for thallium(iii) oxide nano-particles

Abstract

Four new thallium(I) coordination polymers, [TlBt]_n (1) (Hbt = 5-phenyltetrazole), [TlBbt] (2) (Hbbt = 5-(4-bromobenzyl)tetrazole), [Tl₂Bdt]_n (3) (H₂bdt = 5,5′-benzene-1,4-diylbistetrazole), [Tl₂Pht·H₂O]_n and [TlBet] (4), (Hbet = 5-(benzyl)tetrazole) have been synthesized and characterized. The single-crystal X-ray data shows that, in compounds 1–3, the coordination sphere of the Tl(I) ion is the same and it is surrounded with six tetrazolate rings. In compound 4, one thallium atom has three interactions with tetrazolate groups and close Tl^I⋯π (aromatic) contacts with the phenyl ring. Furthermore, in all cases the single-crystal X-ray data show the same stereo-chemical activity of the valence shell electron lone pair of Tl^I. There is a strong Tl^I⋯Tl^I interaction in one dimension in compounds 1 and 3. All these four compounds have been used as new precursors for the preparation of thallium(III) oxide nano-particles through a simple calcination method. Thallium(III) oxide was characterized by powder XRD diffraction and the morphology of nano particles characterized by scanning electron microscope (SEM).