The Crystal and Molecular Structure of Rhodan Hydrate.

The crystal and molecular structure of N-tert-butyldithiophthalimide

“…The most favorable dihedral angle for nbonding in these systems is 90 ° . The dihedral angle of 97.8 ° and the S-S length of 2.007 (1) A fit well with Hordvik's (1966) curve, as we observed previously for N,N'-dithiodisuccinimide (Mazhar-ul-Haque & Behforouz, 1974). If the length of a single S-S bond is taken as 2.08 and a double bond as 1.88 A (Pauling, 1960) and we assume a linear relationship between bond length and bond order, a n-bond order of 0.365 fits well with Hordvik's (1966) proposed bond length/ bond order curve.…”

“…Torsion angles and the intermolecular contacts <3.6 ,/k are given in Tables 4 and 5 respectively. Hordvik (1966) has shown that, for molecules containing a disulfide group X--SH--SII--Y, the bond * Lists of structure factors and anisotropic temperature factors of the non-hydrogen atoms have been deposited with the British Library Lending Division as Supplementary Publication No. SUP 34087 (6 pp.).…”

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

“…An alternative explanation, equally consistent with the CNDO/2 result, for the usually observed C-C-S-S near-coplanarity and the close 1,4 contacts (which may be viewed as dependent effects) involves a consideration of the lone pairs of electrons on S. According to Hordvik (1966), C-S-S-C torsion angles near 90 ° are commonly found because, in part, interatomic repulsive interactions between S lone pairs are minimized near that angle (near 60 ° , actually). The aromatic rings bonded to S may also orient so as to avoid unfavorable overlap with S lone pairs.…”

The structure of sporidesmin G etherate

“…'s vary between 0-4 and 0.7 ° giving the average value of 0.6 °. (e) The molecule of diethyl crease in the torsional angles(Hordvik, 1966;Boyd, ether; e.s.d. 's for the central bonds are 0.01 and for the 1972).…”