Tris(trimethylsilyl)methyl-polyselenides and -polytellurides. X-Ray structure of (Me₃Si)₃CTeTeTeC(SiMe₃)₃

Abstract

Novel polyselenides and polytellurides have been prepared by means of the stabilizing tris(trimethylsilyl)methyl group; [(Me3Si)3C]2Te3, the first compound containing a three tellurium atom chain, crystallizes as a trans-rotamer with a bonding angle of 103.8(1)" at the central tellurium atom and Te-Te bond distances of 2.710(1) A.

Formation of Unexpected Selenium‐Rich Compounds by Selenation of the Very Bulky (PhMe2Si)3CLi:s‐Tetraselenane, a Novel Polyseleno Heterocycle

“…In this communication we would like to present our study of the reactivity of (PhMe 2 Si) 3 CLi towards selenium.…”

“…The introduction of such sterically demanding substituents at the heavier chalcogen elements has been a part of our research for the recent time, because they have been useful to stabilize or detect rather reactive species or intermediates in tellurium(II), [7] and selenium(II) azide chemistry. [8] The tris[dimethyl(phenyl)silyl]methyl group, (PhMe 2 Si) 3 C, is expected to have some increased shielding properties compared to the permethylated substituent. The tellurolate (PhMe 2 Si) 3 CTeLi and the corresponding ditellane, tellurenyl iodide and azide were isolated and charac-tution of the latter could be elucidated from the NMR spectroscopic data and was confirmed by the crystal structure which displays the C 2 Se 4 cycle in the twist form.…”

“…[8] The tris[dimethyl(phenyl)silyl]methyl group, (PhMe 2 Si) 3 C, is expected to have some increased shielding properties compared to the permethylated substituent. The tellurolate (PhMe 2 Si) 3 CTeLi and the corresponding ditellane, tellurenyl iodide and azide were isolated and charac-tution of the latter could be elucidated from the NMR spectroscopic data and was confirmed by the crystal structure which displays the C 2 Se 4 cycle in the twist form. Calculations were performed for the chair and twist conformers of the heterocycles [(H 3 Si) 2 CXX] 2 (X = O, S, Se, Te, Po).…”

“…[1] Chalcogen compounds containing the tris(trimethylsilyl)methyl group, (Me 3 Si) 3 C, have been prepared (sulfur, [2] selenium, [3][4][5] and tellurium [3,6] ). The introduction of such sterically demanding substituents at the heavier chalcogen elements has been a part of our research for the recent time, because they have been useful to stabilize or detect rather reactive species or intermediates in tellurium(II), [7] and selenium(II) azide chemistry.…”

Tellurium: Organic and Organometallic Compounds

“…{(Me 3 Si) 3 C} 2 Te 3 contains a bulky (Me 3 Si) 3 C group. 64 The Te-Te bond length is 2.710(1)Å and the Te-C bond is 2.213(7)Å. {2-(C 5 H 4 N) C 6 H 4 } 2 Te 3 65 is probably stabilized by intramolecular Te· · ·N interactions, as shown in Figure 5 Tellurium has two nuclear magnetic resonance (NMR) active nuclei: 125 Te and 123 Te.…”