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The reaction of tellurium with WCl 6  in the presence of bromine in a sealed evacuated ampoule in the temperature range from 220 to 150 °C yields dark blue monoclinic crystals of β-Te 4 (WCl 6 ) 2 , space group P2 1 /c, lattice constants a = 664,3(2), b = 1273,2(3), c = 1233,6(3) pm, ß - 94,13(3)°. The structure is built of square planar Te 4  2+  cations and slightly distorted octahedral WCl 6  -  anions and shows a close relationship to the previously reported triclinic α-form, which was obtained in the absence of bromine. The difference between the two structures lies in a different packing of the ions

Eine zweite polymorphe Form von Te 4 (WCl 6 ) 2 / A Second Polymorphie Form of Te 4 (WCl 6 ) 2