Synthesis and structural aspects of 1-naphthyltellurium(IV) trichloride (1), bis(mesityl)tellurium(IV) dichloride (2) and bis(chlorobis(2-thiophenyl)tellurium)oxide (3)

Chlorination of bis(1-naphthyl)ditelluride (NplTeTeNpl; Npl = 1-C10H7) with 3 equiv. of sulfuryl chloride (SO2Cl2) resulted in bright yellow crystals of 1-naphthyltellurium(IV) trichloride (1-NplTeCl3; 1). Bis(mesityl)tellurium(IV) dichloride, Mes2TeCl2, 2 (Mes = 2,4,6-Me3C6H2) has been synthesized by the oxidative addition of sulfuryl chloride to bis(mesityl)telluride(II), prepared from detelluration of bis(mesityl)ditelluride with a freshly prepared electrolytic copper. Bis(chlorobis(2-thiophenyl)tellurium)oxide, (Tpn2TeCl)2O, 3 (Tpn = 2-C4H3S) have been obtained serendipitously as a product of reaction between bis(thiophenyl)tellurium(IV) dichloride (Tpn2TeCl2) and AgCN. All the three compounds 1–3 have been characterized crystallographically. In crystal lattice of 1, an asymmetric unit consists of two independent molecules and both the molecules form a separate polymeric zig-zag chains via μ2-chloro bridging. These two polymeric chains are interlinked via C−H⋯Cl H-bonding interactions to form a one dimensional supramolecular array. In case of 2 a dimeric unit has been realized through C−H⋯Cl H-bonding interaction while in 3 a one dimensional supramolecular array has been formed via intermolecular Te⋯Cl1 secondary bonding interactions, where both the tellurium atoms exhibit ψ-trigonal bipyramidal geometry.

Three tellurium(IV) derivatives 1-NplTeCl3 (1), Mes2TeCl2 (2) and (Tpn2TeCl)2O (3) have been synthesized and crystallographically characterized. Preparation of 1 and 2 involves oxidative addition of SO2Cl2 to 1-Npl2Te2 and Mes2Te respectively. The 3 has been obtained by the partial hydrolysis of Tpn2TeCl2. In 3, 1D supramolecular array was formed due to the intermolecular Te⋯Cl interactions.Figure optionsDownload as PowerPoint slide