Untersuchungen zu Struktur und Schmelzverhalten von (C6H5)2As2Se3 und (CH3)3As3Se3

Investigations of the Structure and the Melting Behaviour of (C₆H₅)₂As₂Se₃ and (CH₃)₃As₃Se₃ The compounds (C₆H₅)₂As₂Se₃ and (CH₃)₃As₃Se₃ exist in a crystalline and a glass-like form. Both phases were investigated by the methods of mass, i.r., and u.v. spectroscopy and by DTA. The mass-spectroscopic fragmentation patterns are shown. The proposed structures of the crystalline forms are confirmed by these results. In the melts equilibria exist between the cyclic molecules of the crystalline forms and chains and other rings. On attempts to prepare the compound (C₆H₅)₃As₃Se₃, only (C₆H₅)₂As₂Se₃ was found. The possible reasons of the preferred stability of the five ring molecule are discussed.