Zusammenfassung
Orange coloured crystals of [Co(NH3)(6)](2)As12Se4. 12 NH3 were prepared by the reduction of As4Se4 with a solution of sodium in liquid ammonia and subsequent precipitation with CoBr2. The X-ray structure determination shows them to contain the selenoarsenate anion As12Se44-, which consists of a central As-12-cage with four exo-bonded, formally negatively charged Se atoms. The structure of the ...
Zusammenfassung
Orange coloured crystals of [Co(NH3)(6)](2)As12Se4. 12 NH3 were prepared by the reduction of As4Se4 with a solution of sodium in liquid ammonia and subsequent precipitation with CoBr2. The X-ray structure determination shows them to contain the selenoarsenate anion As12Se44-, which consists of a central As-12-cage with four exo-bonded, formally negatively charged Se atoms. The structure of the As-12-cage is equivalent to the main polyphosphorus building unit of a known organopolyphosphane and of tubular P-12 in the compound (CUI)(3)P-12.
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