{K-[2 2 2]-Crypt}2Se7·H20; Synthese, IR-Spektrum und Kristallstruktur
Volker MüllerKurt DehnickeDieter FenskeGerhard Baum
Abstract
{K-[2 2 2]-Crypt} 2 Se 7 ·H 2 0 has been prepared by the reaction of a solution of potassium polyselenide in dimethylformamide at room temperature as black crystals, which were characterized by IR spectroscopy as well as by an X-ray structure determination. Space group P2 1 /n, Z = 4, 5055 observed unique reflexions, R = 0.103. Lattice dimensions at 20 °C: a = 1435(1), b = 1320(1), c = 2966(2) pm, β = 102.50(6)° The heptaselenide ion represents approximately part of a helical chain of polymeric selenium.
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