[H3O · (Dibenzo-18-crown-6)][Te2Br9] and [H5O2][Te2Cl9] · 2 C4H8O2: Two New Oxonium Halotellurates(IV) Containing a Novel Type of [Te2X9]– Anions

✍ Scribed by O. Reich; S. Hasche; S. Bonmann; B. Krebs

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: German
• Weight: 179 KB
• Volume: 624
• Category: Article
• ISSN: 0372-7874
• DOI: 10.1002/(sici)1521-3749(199803)624:3<411::aid-zaac411>3.0.co;2-u

✦ Synopsis

Red crystals of [H 3 O ´(dibenzo-18-crown-6)][Te 2 Br 9 ] (1) were isolated from a solution of TeBr 4 and dibenzo-18crown-6 in CH 3 CN containing a small amount of hydrobromic acid. The compound crystallizes in the triclinic space group P 1 with the cell dimensions a = 9.010(2), b = 13.403(3), c = 14.606(4) A Ê , α = 98.94(2)°, b = 100.40(2)°, and c = 91.40(2)°(150 K). From a solution of TeCl 4 in 1,4-dioxane containing hydrochloric acid [H 5 O 2 ][Te 2 Cl 9 ] ´2 C 4 H 8 O 2 (2) precipitates as colorless crystals in the orthorhombic space group Pnma with the cell dimensions a = 17.023(4), b = 13.389(4), and c = 10.900(3) A Ê (150 K).

In both structures the [Te 2 X 9 ] ± anion (X = Cl, Br) consists of one TeX 6 octahedron and one TeX 5 square pyramidal unit connected by a common edge. In compound 1 the coordination sphere of the square pyramidal fragment is completed by a very weakly g 6 bound benzo group of the cationic unit.

In compound 2 an oxygen atom of the oxonium ion weakly interacts with the fivefold coordinated tellurium atom. The cationic units are a crown ether oxonium complex in 1 and a supramolecular 1,4-dioxane-oxonium network in 2.