Darstellung und Eigenschaften trimerer Chlorotellurate(IV). Kristallstruktur von (C₆H₅)CTe₃Cl₁₃/ Preparation and Properties of Trimeric Chlorotellurates(IV). Crystal Structure of (C₆H₅)₃CTe₃Cl₁₃

Abstract

<jats:title>Abstract</jats:title><jats:p> The trimeric chlorotellurate(IV) ion Te<jats:sub>3</jats:sub>Cl<jats:sub>13</jats:sub>- is obtained in benzene solution as a degradation product of cubane-like tetrameric tellurium(IV) chloride Te<jats:sub>4</jats:sub>Cl<jats:sub>6</jats:sub> and can be isolated by crystallization in the form of salts with large cations. The crystal structure of the triphenyl-methyl salt (C<jats:sub>6</jats:sub>H<jats:sub>5</jats:sub>)<jats:sub>3</jats:sub>CTe<jats:sub>3</jats:sub>Cl<jats:sub>13</jats:sub> (P2<jats:sub>1</jats:sub>/c, a = 1109.5, b = 1644.4, c = 2043.9 pm, β = 114.50°) shows the Te<jats:sub>3</jats:sub>Cl<jats:sub>13</jats:sub>- ion to have approximate C<jats:sub>3V</jats:sub> symmetry; as a fragment of the Te<jats:sub>4</jats:sub>Cl<jats:sub>16</jats:sub> cube it consists of three edge-sharing octahedra with a central triply bridging Cl. Bond distances Te-Cl (tripl.br.) 292.4-298.4, Te-Cl (doubl.br.) 270.6-286.3, Te-Cl (term.) 232.0-238.8 pm. The vibrational spectrum of Te<jats:sub>3</jats:sub>C<jats:sub>13</jats:sub>- is discussed.</jats:p>

Structures of the tetrafluoroborate salts of triphenylcarbenium ions with one and with two 4-methoxy substituents: stable carbocations

“…The average twist is similar to that found in the triphenylcarbenium cation (Gomes de Mesquita, MacGillavry & Eriks, 1965;Krebs & Paulat, 1979) and in derivatives with identical substitution on all three rings (Koh & Eriks, 1971;Andersen & Klewe, 1965). The unit-cell dimensions of the structures reported here are quite similar, and they have a common space group.…”

“…The aryl rings are twisted about 30 ° out of the central carbenium plane in each case, for unsubstituted triphenylcarbenium ions with a variety of counterions (Gomes de Mesquita, MacGiUavry & Eriks, 1965;Krebs & Paulat, 1979;Fenske, Kujanek & Dehnicke, 1983;Cook, Dahl & Dickerhoof, 1972) and for tris(4-aminophenyl)carbenium perchlorate (Koh & Eriks, 1971). A similar angle of twist has been estimated for the tris(4-methoxyphenyl)carbenium ion in a structure subject to considerable disorder (Andersen & Klewe, 1965).…”

Solvatisierte HalogenochaLkogen(IV)säuren, I Darstellung und Struktur des Hexabromoselen(IV)säure-Hydrats (H5O2)2SeBr6 · 4H2O / Solvated Halogeno-Chalcogen(IV) Acids, I Preparation and Structure of the Hexabromoselenium(IV) Acid Hydrate (H5O2)2SeBr6 · 4H2O

“…Während in unpolaren oder schwach polaren Lösungsmitteln Gleichgewichte zwischen Tellurtetrahalogeniden und niedermolekularen Bruchstücken nachgewiesen wurden, die sich als Te3Cli3~- [7], Te2Clio 2 -- [8] und Te2Bri0 2 --Ionen [8] in Form ihrer Salze mit großen organischen Kationen isolieren ließen, weisen schwingungsspektroskopische Untersuchungen [9] auf die Existenz der Endprodukte einer solchen Abbaureihe, der regulär oktaedrisch aufgebauten Hexahalogenoselenat(IV)-bzw.…”