Crystal and Molecular Structures as well as Spectra of Two Organic Tetrasulfanes R₂S₄ (R = 2‐benzothiazolyl and 4‐chlorophenyl)

Abstract

Bis(2‐benzothiazolyl)tetrasulfane prepared from the mercaptane and S2Cl2 crystallizes in the monoclinic space group C2/c with a = 3513 pm, b = 577.28 pm, c = 800.0 pm, β = 98.74°, ρ = 1.64 g cm−3 (at 298 K). The molecules are of C2 symmetry with the geometrical parameters of the S4 backbone: dss = 202.7 (terminal) and 207.3 pm (central), αsss = 106.4°, τssss = 78.5°. The overall conformation is all‐trans. Bis(4‐chlorophenyl)tetrasulfane prepared from the mercaptane and diisopropoxydisulfane crystallizes in the monoclinic space group P21/a with a = 1237.7 pm, b = 748.4 pm, c = 1623.9 pm, β = 105.58°, ρ = 1.61 g cm−3 (at 298 K). The molecules occupy general positions but are approximately of C2 symmetry with dss = 203.6 (terminal), 206.7 (central) and 202.3 pm (terminal), αsss = 107.4° and 108.4°, τssss = 75.5° (all‐trans conformation). The intermolecular interactions are of van der Waals type. Infrared, Raman, mass and NMR spectra (1H, 13C) are reported.

Thioether‐bridged Mesoporous Organosilicas: Mesophase Transformations Induced by the Bridged Organosilane Precursor

“…Inc., Chinese Medicine Group. The nonionic block copolymer surfactant Pluronic P123 (EO 20 -PO 70 -EO 20 , weight-average molecular weight 5800 g mol …”

“…In the present work, P123 (EO 20 -PO 70 -EO 20 , EO: ethylene oxide; PO: propylene oxide), one of the most studied surfactants, is used as template. The poly(ethylene oxide) (PEO) chains are hydrophilic, whereas the poly(propylene oxide) (PPO) chains tend to be hydrophobic, thus driving the formation of micelles with the PPO chains as the core and the PEO chains as the corona.…”

Optimization of the Synthesis of Symmetric Aromatic Tri- and Tetrasulfides

“…To our knowledge, there exists no comprehensive study of the formation of this class. Oxidation of hydrodisulfides in the presence of iodine, coupling of thiols with dialkoxy disulfides (ROSSOR), , sulfur insertion reactions, and electrophilic aromatic substitution with sulfur monochloride have all been reported as preparative methods.…”

Glyconothio‐O‐lactones. Part III. Thermolysis of a 4,5‐Dihydro‐1,2,3‐ and a 2,5‐Dihydro‐1,3,4‐thiadiazole

“…In the solid state, 11 is C,-symmetric3). In keeping with the structure of all organic tetrasulfides deposited in the Cambridge Database [I71 [18], 11 shows the all-trans-conformation [18]). The lengthening of the C-S bonds may be enhanced by the quarternary acetal center4).…”