Acta Cryst. (2004). E60, o2235-o2237  [ doi:10.1107/S1600536804024055 ]

A low-temperature redetermination of the monoclinic -form of cyclooctaselenium

T. Maaninen, J. Konu and R. S. Laitinen

Abstract: Monoclinic -cyclooctaselenium, Se₈, crystallizes as discrete eight-membered ring molecules. The low-temperature (150 K) crystal structure is composed of cyclic crown-shaped molecules, similar to those of - and -Se₈. The average Se-Se bond length is 2.308 (8) Å, the average bond angle is 105.7 (8)° and the average torsion angle is 101 (2)°. In contrast with -Se₈, the structure of -Se₈ does not show elongation of the ring at low temperatures.

Online 6 November 2004

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