4,5‐Bis­(ferrocenyl­methyl­thio)‐1,3‐di­thiol‐2‐one

In the compound 4,5‐bis­(ferrocenyl­methyl­thio)‐1,3‐di­thiol‐2‐one, [Fe₂(C₅H₅)₂(C₁₅H₁₂OS₄)], the values of the geometric parameters of the ferrocene and 1,3‐di­thiol‐2‐one (dmio) moieties are within normal ranges. The dmio group is essentially planar. There are no short S?S contacts.     

13H‐Dibenzo­[a,i]­fluoren‐13‐one

Molecules of 13H‐dibenzo­[a,i]­fluoren‐13‐one, C₂₁H₁₂O, strad­dle a crystallographic mirror plane and are essentially planar, with a dihedral angle of only 1.9 (1)° between the two naphtha­lene ring systems. Repulsive intramolecular C=O?H interactions therefore do not explain the larger distortions found in isomeric ketones.     

Pentacarbonyl(di‐2‐pyridyl­amine)tungsten(0)

In the title molecular complex, (I), the W atom is in an octahedral environment with four equatorial carbonyl ligands and a fifth in an axial position trans to the monodentate dipyridyl­amine ligand. The long dimension of this last bisects the angle between two of the equatorial carbonyl groups and while the non‐bonded pyridyl N atom is directed away from the W atom, the bridging amine group is directed towards it. Thus, in addition to the N atom to which it is attached, the amino H has two nearest neighbour C atoms of equatorial carbonyl groups but does not participate in hydrogen bonding in any real or usual sense. The W—C bond distance for the axial carbonyl group is notably less than those of the equatorial groups.     

The crystal and molecular structure of tetracarbonyl(6-p-styryl-2,2′-bipyridyl)tungsten(0). An examination of the affect of a bulky group α to one coordinating nitrogen atom in a bidentate ligand

The crystal and molecular structure of tetracarbonyl(6-p-styryl-2,2′-bipyridyl)tungsten(0) have been determined by single crystal X-ray techniques. Cell dimensions are a 13.735(17), b 8.839(6) and c 17.105(12) Å for the monoclinic unit cell with β 109.06(8)° and Z = 4. The space group was determined as P2₁/n. The structure was solved by conventional Patterson and Fourier methods and refined to a final R-value of 0.055 (1734 unique reflections) by block diagonal least squares. The molecule consists of monomeric units containing one tungsten atom bound to four terminal carbonyl groups and to one 6-p-styryl-2,2′-bipyridyl ligand via its two nitrogen atoms. The presence of the styryl group α to one coordinating nitrogen causes a significant difference in the bond lengths between the central tungsten atom and the nitrogen atoms (WN(1), 2.29(1) Å; WN(2) 2.23(1) Å).     

X-ray and molecular mechanics studies on the crystal and molecular structure of the leucoacetate of ventilatone A

Molecular details of the leucoacetate of ventilatone A have been obtained by X-ray crystallographic and molecular mechanics calculations. In the crystalline state (space group P1,Z=2) the two independent molecules of the asymmetric unit appear to be disordered as some unusual geometrical features are evident. As these two molecules are related by a pseudo center of symmetry details of space group assignment are presented. Evidence of bond order in the molecules is supported by previously published spectroscopic data.