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5492229 
Journal Article 
[Cleavage of S4N4 to S2N2 at Room Tem perature: Preparation and Structure of S2N2 • 2AlBr3] 
Thewalt, U; Holl, K 
2014 
1 
Zeitschrift für Naturforschung B
ISSN: 0932-0776 
39 
2 
145-148 
English 
The compound S2N2 • 2AlBr3 has been prepared by reaction of S4N4 with AlBr3 in 1,2-dibromoethane at room temperature. Its crystal and molecular structure have been determined by X-ray diffraction; R = 0.068. Crystal data: monoclinic, P 21/n, a = 9.594(5), b = 9.975(4), c = 7.528(4) Å , β = 111.36(5)°. The S2N2 ring of the centrosymmetrical complex is bonded via its nitrogen atoms to two AlBr3 units thus completing coordination tetrahedra around the Al atoms. Bond distances and angles within the S2N2 ring are d(S-N) = 1.629(13) and 1.651(13) Å, ∢ (S-N-S) = 95.8, and ∢ (N-S-N) - 84.2°. Whereas the S-N bond lengths agree closely with those of free S2N2, the angle at N is enlarged by ca. 5° and the angle at S is decreased by ca. 5°. The sulfur atoms form two close S···Br contacts of length 3.149 (intramolecular) and 3.193 (intermolecular) Å , respectively. The intermolecular attractive nonbonded S···Br interactions tie the complexes together in a way that leads to infinite chains which run parallel to the crystallographic z axis. 
Aluminium Tribromide Adduct; Disulfurdinitride Ligand; Molecular Structure; Tetrasulfurtetranitride; article; aluminum; ambient temperature; bromine; chemical bonding; chemical structure; geometry; nitrogen; X-ray diffraction