Die Kristallstruktur von [Na(12-Krone-4)2+]2Se82- · (Se6, Se7) / The Crystal Structure of [Na(12-Crown-4)2+]2Se82- · (Se6, Se7)
1991 ◽
Vol 46
(10)
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pp. 1287-1292
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Keyword(s):
X Ray
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The title compound was prepared from sodium polyselenide and 12-crown-4 in DMF solution in the presence of cerium(III)chloride in the form of black needles. The crystal structure determination by X-ray diffraction shows a partially disordered structure, in which the anionic units Se82- · Se7 and Se82- · Se6 are present in the ratio 0.72/0.28. These units are associated to layers parallel to (100); the layers alternate with pseudohexagonal layers of [Na(12-crown-4)2]+ ions. Space group P1̅, Z = 2, 3903 observed unique reflections, R = 0.114, wR= 0.084. Lattice dimensions at -65°C: a = 1247.9(3), b = 1367.8(8), c = 1660(1) pm, α = 94.65(5), β = 98.94(3), γ = 91.10(3)°.
1976 ◽
Vol 31
(6)
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pp. 885
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1993 ◽
pp. 1625
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1994 ◽
Vol 49
(7)
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pp. 983-986
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Keyword(s):
Keyword(s):
1996 ◽
Vol 51
(11)
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pp. 1583-1586
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1998 ◽
Vol 213
(12)
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Keyword(s):
1992 ◽
Vol 47
(8)
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pp. 1075-1078
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Keyword(s):