Showing papers by "Bryan M. Gatehouse published in 1972"

Crystal and Molecular Structure of the 2:1 Adduct of Bis(pentafluorophenyl)mercury(II) and Bis(diphenylarsino)methane

Abstract: The title compound crystallizes in the monoclinic system with a= 14·07, b= 17·34, c= 19·33 A, β= 91° 3′, Z= 4, and space-group C2/c. The structure was solved by conventional Patterson and Fourier methods and refined by least-squares techniques to R 0·9 for 1218 independent reflections. The compound has a two-fold axis about the methylene carbon atom of the diarsine moiety. Each mercury atom has one arsenic atom within the sum of van der Waals radii from it, and there is a T-shaped distribution of two C6F5 groups and the arsenic atom about mercury with a Hg ⋯ As distance of 3·40 ± 0·02 A and C–Hg–C angle of 173 ± 4°. X-Ray powder diffraction photographs indicate that the compound [(C6F5)2Hg]2Ph2P·CH2·PPh2 has the same structure.

The Crystal Structures of Disordered Crystals of Adducts of Diphenylmercury with Bidentate Ligands

Abstract: The crystal structures of two adducts of diphenylmercury with neutral bidentate nitrogen donor atom ligands have been determined, showing very weak interactions between mercury and nitrogen atoms. The crystals are disordered in a manner giving rise to diffuse reflexions for which k is odd. The crystal of diphenylbis-(2,4,7,9-tetramethyl-l,10-phenanthroline)mercury(lI) studied has a=21.09, b= 14.54, c= 14.65 A, beta = 120°34', Z=4, and space group Cm. Crystals of diphenylbis(2,9-dimethyl-l,1O-phenanthroline)mercury(II) have a= 15.42, b= 14.28, c= 14.55 A, alpha~beta~gamma 90°, Z=4,and spacegroup PI with approximate Pm symmetry. Both adducts have their planar ligands in (040) with the C-Hg-C units of Ph2Hg moieties aligned in the [010] direction. Each diphenylmercury moiety has one ligand adjacent to it with Hg-N distances of 2.8-3.0 A, and one-half of the ligands in the crystals do not have a mercury atom adjacent to their nitrogen atoms. Within the unit cell of each adduct every second (040) plane has 0·5 occupancy for two Ph2Hg moieties with mercury atoms in those planes, and every other (040) plane has 0·8 and 0.2 occupancy for two Ph2Hg moieties in those planes, giving one Ph2Hg for every two ligands.