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S 4 N 4  reacts with NH 4  + FeBr 4  -  in benzene to give the 1:1 inclusion compound NH 4  + FeBr 4  -  • S 4 N 4 . The dark red crystals are monoclinic, space group Cc with Z = 4 and lattice constants a = 6.430(1), b = 17.644(4), c = 12.180(2) Å , and β = 90.77(3)°. An X-ray analysis shows that the geometry of the S 4 N 4  group is almost identical to that of crystalline tetrasulfur tetranitride. The S 4 N 4  molecule is surrounded by ionic neigbors in such a way that the S atoms form close contacts to Br atoms of the FeBr 4  -  anions and the N atoms are close to the NH 4  +  cations.

NH 4 + FeBr 4 - • S 4 N 4 , eine Einschlußverbindung von ungeladenem S 4 N 4 in eine ionische Wirtsverbindung