Die Kristallstruktur des Ethylendiammonium-hexasulfids (2. Mitteilung über Alkylammonium-Polysulfide [1])/The Crystal Structure of Ethylenediammonium Hexasulfide

Abstract

<jats:p>Ethylenediammonium hexasulfide has been synthesized from ethylenediamine, sulfur, and gaseous H<jats:sub>2</jats:sub>S in aqueous solution. X-ray investigations on single crystals revealed its structure. The monoclinic unit cell contains eight formula units, the space group is Cc. The sulfur atoms form unbranched zig-zag chains S<jats:sub>6</jats:sub><jats:sup>2-</jats:sup> in all-trans-conformation.</jats:p>

Charge-assisted N(+)–H···(−)S hydrogen bonds in the crystal structure of selected diammonium thiophenolates

“…9a) strengthened by C-HÁÁÁp interactions (Table 2) different from the 3-D network of crystal 2. The NÁÁÁS distances in three salts lie in the range 3.155 (3)-3.286 (3) Å , comparable with values observed in other silanethiolates [26,27], aromatic thiolate [25,39,40], ditiocarbamates [41][42][43] or sulfides [44][45][46].…”

“…10). The stretching bands in the range 3350-3150 cm -1 can be attributed to the vibration of the primary ammonium cations [46]. The spectrum of the zwitterionic amino acid L-tyrosine shows the effect of protonation of the amino group, with the N-H stretching vibration occurring over a broad range 3100-2600 cm -1 [48].…”

Convenient synthesis, X-ray crystal structure, and Raman spectrum of the heptasulphide dianion, S72−, in [PPN]2S7•2EtOH

“…2EtOH. In contrast, it should be noted that the values of the S-S distances in the all-trans S6'-ion of ethylenediammonium hexasulphide alternate, the shortest being the internal S-S bond (22), whereas no significant difference between internal and terminal S-S bond lengths was found for [BuqNI2S6 (24). The average S-S bond length in observed for the S72-ion in these two salts.…”

“…90" for all trans-conformations and torsion angles of ca. 72' for all cis-conformations (22). Unlike cyclic sulphur allotropes (25), there appears to be no obvious correlation between S-S bond lengths and torsion angles in anionic polysulphide chains.…”

“…are normally close to 90" (20). For example, the S6' -ion can have three isomers, (cis,cis), (cis, trans), or (trans, trans) and there are six possible conformations of the S7'-ion.3 Previous X-ray structural investigations have revealed only all cis-or, more frequently, all transconformations for sX2-(X = 5-7) (22). The former configuration is present in cyclo-Ss while the latter is the configuration of the helices of fibrous sulphur and of the s7'-ion in (PhP)2S7 (5).…”