Synthese und Kristallstruktur von [Se₃N₂Cl]⁺SbCl₆ ^- / Synthesis and Crystal Structure of [Se₃N₂Cl]⁺SbCl₆ ^-

Abstract

Chloro-Cycloselenazenium Hexachloroantimonate(V), Synthesis, Crystal Structure[Se3N2Cl]+SbCl6~ has been prepared as red crystals by the reaction of the nitride chloride Se2NCl5 with antimony(III) chloride in dichloro methane. It was characterized by a crystal struc ture determination. Space group PI, Z = 2, 4396 observed unique reflections, R = 0.030. Lattice di mensions at -80 °C: a = 698.2, b = 699.7, c = 1510.5 pm, a = 89.45°, ß = 86.18°, y = 68.22°. The struc ture consists of two symmetry-independent ca tions and two symmetry independent anions, which differ only slightly from each other. The cations contain Se3N2 five-membered rings, which deviate very little from planarity as shown by fol ding angles of 14° and 18°. The Se-N bond distan ces are between 171.4 and 176.4 pm suggesting double-bond constituents.

Experimental and Theoretical Investigations of Structural Trends for Selenium(IV) Imides and Oxides: X-ray Structure of Se3(NAd)2

“…An X-ray structural determination of 6b revealed a five-membered ring (Figure ). Although five-membered rings are known for selenium−nitride systems, e.g., Se 3 N 2 Cl + , − the heterocycle 6b represents a previously unknown ring size for chalcogen imides. It is the first member of the homologous series [Se 3 (NR) 2 ] n ( n = 1, 2, 3) for which only the 15-membered ring Se 9 (N t Bu) 6 has been structurally characterized .…”