In:
Zeitschrift für Naturforschung B, Walter de Gruyter GmbH, Vol. 46, No. 10 ( 1991-10-1), p. 1293-1299
Abstract:
The title compounds have been prepared by the reactions of a potassium diselenide solution in DMF with excess selenium in the presence of tetraethyl and tetrapropyl ammonium chloride, respectively. They were characterized by X-ray crystal structure determinations. (NEt 4 + ) 2 [Se 5 2- ·1 /2 Se 6 · Se 7 ]: Space group PĪ, Z = 2, 2514 observed unique reflections, R = 0.085. Lattice dimensions at —40 °C: a = 957.7(4), b = 1384.2(4), c = 1545.3(7) pm, α = 107.32(3)°, β = 97.27(4)°, γ = 105.94(3)°. The compound has an ionic structure of NEt 4 + ions and chains of pentaselenide ions, which are associated with Se 6 and Se 7 , ring molecules, forming layers parallel to (110). (NPr 4 ) 2 Se 11 : Space group C2/c, Ζ = 4, 2198 observed unique reflections, R = 0.082. Lattice dimensions at —40 °C: a = 2364.7(5), b = 1206.8(2), c = 1609.6(3) pm, β = 118.74(3)°. The compound consists of cations (N(C 3 H 7 ) 4 + and spirocyclic anions Se 11 2- , in which two Se 6 rings having chair conformation are linked by a common Se atom with planar coordination. There are no short contacts between the S 11 2- ions.
Type of Medium:
Online Resource
ISSN:
1865-7117
,
0932-0776
DOI:
10.1515/znb-1991-1003
Language:
English
Publisher:
Walter de Gruyter GmbH
Publication Date:
1991
detail.hit.zdb_id:
2078109-X
detail.hit.zdb_id:
124635-5
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