Untersuchungen zur möglichen Existenz des S4N4 ⊕-Radikalkations und die Kristallstruktur von S4N4[FeCl4] / Investigations Concerning the Possible Existence of the S4N4 ⊕ Radical Cation and the Crystal Structure of S4N4H[FeCl4]

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Abstract
Brom ination o f S4N 4 Cl[FeCl4], Preparation o f S4N 4 H [FeX 4] (X = Cl, Br), IR Spectra, Crystal Structure of S4N4H[FeCI4] S4N 4 H [FeC l4] as well as S4N 4 D [F eC l4] were prepared in C H 2C12 by reaction o f S4N 4 with FeC l3 and C H 3C O O H and CH 3C O O D , respectively. Bromination o f S4N 4C l[FeCl4] with M e3SiBr in C H 2 C12 yields S4N 4 H[FeBr4]; in this reaction, S4N 4 Br® is presumably formed initially; it then decom p oses by elimination o f bromine and formation of the S4N 4® radical cation; the latter reacts with the solvent, yielding the S4N 4 H® cation. Brom ination of S3N 2C l[FeCl4] with M e3SiBr affords S6N 4 [FeBr4]2. The IR spectra o f the com pounds are discussed. The crystal structure o f S4N 4 H [FeC l4] was determined by X-ray diffraction (1210 observed reflexions, R = 0.035). Crystal data: a = 803.8, b — 1003.9, c = 1507.7 pm, β = 104.52°, Z = 4, space group P 2,/c.

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