The crystal and molecular structure of di-2-pyridyl disulfide

Abstract

The crystal and molecular structure of di-2-pyridyl disulfide has been determined by single-crystal X-ray diffraction using the 1578 unique and significant (at the 3o level) reflections for which 20 < 50 °, and was refined to an unweighted R index of 0.048. Counter methods and monochromatized Mo Ka radiation were employed. Crystals form in the monoclinic space group P2~/c (or P2~) with cell dimensions a = 13.310 (3), b = 5.581 (2), c= 15.946 (5) A, and/~ = 119.55 (2) °. All H atoms were located on a difference Fourier function and their positions were refined. The S-S bond length is 2.016 (2) A and the average S-C distance is 1-785 A. The C-S-S-C torsion angle is 87.1 o. The S-S bond is nearly in the plane of each pyridine ring, one of which is disordered in P2~/c.

Structure of di-p-tolyl diselenide, C14H14Se2

“…All the compounds listed by Raghavan & Serf (1977), who update Shefter's (1970) compilation, support that observation. It seemed worthwhile to extend this observation to the diselenides (Table 3).…”

One‐Pot Synthesis of Pyridyltellurium Derivatives from a Reaction with Isopropylmagnesium Chloride and X‐ray Crystal Structures of Various Pyridyl Ditellurides

“…[23] The Te (1)ϪC (1) [24] [2.135(6), 2.127(5) Å ]. The CϪEϪEϪC torsion angles are similar: 87.1°for E ϭ S, [25] 84.3(2)°for E ϭ Se [26] and 86.3(2)°for E ϭ Te. Needle-shaped copper-colored crystals of compound 8 were obtained by slow evaporation of a solution in dichloromethane and hexane.…”

Conformational consequences of intramolecular hydrogen bonding by OH to the directional lone-pair of sulfur in derivatives of methyl phenyl sulfide, diphenyl sulfide, and diphenyl disulfide

“…The present results provide no evidence for OH..n interactions (3). It is of interest that the corresponding diamino compound has this conformation in the crystal, i.e., axial with the amino groups on the same side of the molecule (38,45). From our viewpoint, this conformation is expected.…”

“…The filled 3p lone pair electrons minimize their mutal repulsion by a twist of 90" to give the observed conformation. If hydrogen atoms are replaced by phenyl groups, the CSSC dihedral angle remains near 90" (38,45,46). Furthermore if 3p ,n conjugation is to be maintained, then the CCSS torsion angles are favored at 0°, yielding the observed equatorial (47) conformation.…”