A low-temperature redetermination of the monoclinic -form of cyclooctaselenium
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 α- 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 α-Se8, the structure of -Se8 does not show elongation of the ring at low temperatures.
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Document Type: Research Article
Publication date: December 1, 2004