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Issue 7, 1992
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Preparation of SeNSNSe(AsF6)2 and structural characterisation of the 6π‘electron-rich aromatic’ SeNSNSe2+

Edward G. Awere,  Jack Passmore  and  Peter S. White 

Abstract

Highly crystalline [graphic omitted]e(AsF6)2 was prepared by the oxidation of ([graphic omitted]e)2(AsF6)2 with AsF5 in liquid SO2. The X-ray crystal structure was determined which consists of discrete planar [graphic omitted]e2+ cations and AsF6– anions with significant cation–anion interactions. The average Se–N [1.70(2)], S–N [1.59(1)] and Se–Se [2.310(2)Å] bond distances are consistent with the removal of the unpaired electron from the π* singly occupied molecular orbital of the 7π [graphic omitted]e˙+. The 77Se [–70 °C, δ(Me2Se)= 2411.7, v½= 10.2 Hz] and 14N NMR [r.t., δ(MeNO2)=–72.5, v½= 690 Hz] and Raman spectrum in AsF3 solution are all consistent with retention of the ring structure in solution. The reaction of Se4(AsF6)2 and S4N4 was reinvestigated and found to give appreciable amounts of ([graphic omitted])2(AsF6)2 and ([graphic omitted])2(AsF6)2 as well as the reported ([graphic omitted]e)2(AsF6)2. A pure sample of ([graphic omitted]e)2(AsF6)2 was prepared by reduction of [graphic omitted]e(AsF6)2 with CsN3.

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Article type: Paper
DOI: 10.1039/DT9920001267
Citation: J. Chem. Soc., Dalton Trans., 1992,0, 1267-1275
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    Preparation of SeNSNSe(AsF6)2 and structural characterisation of the 6π‘electron-rich aromatic’ SeNSNSe2+

    E. G. Awere, J. Passmore and P. S. White, J. Chem. Soc., Dalton Trans., 1992, 0, 1267
    DOI: 10.1039/DT9920001267

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