Crystal and molecular structure of bistriphenylphosphinecadmium(II) chloride

Abstract

Crystal and Molecular Structure of B ist riphenyl phosp hinecadmium( 11) ChlorideBy A.

Structure of di-μ-chloro-bis[chloro(1-diethylamino-2-diphenylphosphinoethane)cadmium(II)]

“…2.73/~ in CdClz(thiocarbohydrazide-N,S)2 (Bigoli et al, 1971) and 2.742, 2.754, and 2.802A in CdCI2(NH2C3H6NH2) (Andreetti, Cavalca, Pellinghelli & Sgarabotto, 1971). The Cd-P bond distances of 2.563 and 2.617 ,/~ are quite consistent with the sum of the covalent radii for Cd and P (1.48 + 1.10 = 2.58/~) (Pauling, 1967) and with typical experimental values of 2.632 and 2.635 ,/~ in CdCI2[(C6Hs)aPI z (Cameron & Forrest, 1971).…”

“…2 (3) 105.6 (3) P-C (7) plexes, e.g. Cd-CI = 2.440 and 2.504/k in the monomeric four-coordinate CdCI2[(C6Hs)3P] 2 (Cameron & Forrest, 1971) and 2.485 and 2.497A in the (4 + 2) six-coordinate CdClz(1-methylcytosine) 2 (Gagnon, Beauchamp & Tranqui, 1979). The centrosymmetric dimers A and B exhibit rather unusual asymmetry with both strong (2.484 and 2.520 ,/~) and moderate (2.779 and 2.780 A) bridging Cd-CI bond lengths.…”

“…Crystallographic studies of several of these complexes reveal a range of metal coordination numbers from two to nine, although two, four, and six are predominant (Fawcett, Ou, Potenza & Schugar, 1978;Orioli & Ciampolini, 1972;Cameron & Forrest, 1971;DiVaira & Orioli, 1968). Often the secondary valence is satisfied by a combination of strongly and moderately or weakly bound ligands in the coordination sphere.…”

Crystal structure of dichlorobis(1-methylcytosine)cadmium(II)

“…cdc142 -, 2.432-ture factors and temperature factors are available upon request.' The scattering curves used were those of Cromer and 2.465 A (12); CdCl,($,P),, 2.440 and 2.504 A (13)). …”

Structure cristalline du tétrathiocyanatomercurate(II) de tétraphénylphosphonium [(C6H5)4P]2[Hg(SCN)4]

“…Cet encombrement n'est pas particulier ~ ce compos6-ci, puisque des effets de m~me grandeur existent dans (C6H5)3 P libre (Daly, 1964) ou coordonn6 (Jarvis, Mais & Owston, 1968;Cameron, Forrest & Ferguson, 1971), ainsi que dans (C6Hs)sP (Wheatley, 1964). [(C6Hs)4P] + un nombre assez important de contacts relativement courts (Tableau 4), qui ont sans doute quelque relation avec les 6carts aux sym6tries id6ales des cations et des anions.…”