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'FIR Spectra' in keywords Facet   Publication Year 1992  [X]
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1992[X]
1Author    Volker Müller, Gerlinde Frenzen, K. Urt Dehnicke, Dieter FenskeRequires cookie*
 Title    Synthese, FIR-Spektren und Kristallstrukturen der Pentaselenide K2Se5 und [Na(15-Krone-5)l2Se5 Syntheses, F IR Spectra, and Crystal Structures of the Pentaselenides K 2Se5 and [Na( 15-crown-5)]2Se5  
 Abstract    K2Se5 has been prepared by crystallization from a potassium polyselenide solution in D M F. In a similar way [Na(15-crown-5)]2Se5 can be prepared by crystallization from a sodium p oly­ selenide solution in D M F in the presence o f 15-crown-5. Both com pounds were characterized by FIR spectroscopy as well as by X-ray structure determinations. K2Se5: Space group P 2,2,2,, Z -4, 1659 observed independent reflections, R = 0.061. Lat­ tice dim ensions at -9 0 °C; a = 671.5(5), b = 694.9(5), c = 1776.4(9) pm. The com pound crys­ tallizes with the K2S5 type structure. [Na(15-crown-5)]2Se5: Space group P 1, Z = 2, 3026 observed indenpendent reflections, R = 0.140. Lattice dim ensions at -1 0 0 °C: a = 853.7(5), b = 1042.8(10), c = 2011.0(10) pm; a = 88.95(5)°, ß = 79.42(5)°, y = 66.15(5)°. The compound forms an ion triple, in which the sodium ions are coordinated by the five oxygen atoms o f the crown ether molecules as well as by the terminal selenium atom s o f the pentaselenide chain. The rather high R value is a result o f the disordered crown ether molecules. 
  Reference    Z. Naturforsch. 47b, 205 (1992); eingegangen am 23. August 1991 
  Published    1992 
  Keywords    Pentaselenides, Syntheses, FIR Spectra, Crystal Structure 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-0205.pdf 
 Identifier    ZNB-1992-47b-0205 
 Volume    47