The Crystal Structure of trans-Dichloridodiaquoethylenediaminechromium(III) Chloride, trans-[CrCl2(H2O)2en]Cl.

Dimeric iodo[bis(diphenylphosphinoethyl)sulphido]silver

“…The lengthening is not great enough, however, to compensate for the Ag-Ag elongation, and the P(1)-Ag-P(2) angle has thus increased from 117.7 (1) to 119-87 (7) °. The Ag-I distances of 2.911 (1) and 2.879 (I) A agree well with the mean Ag-I distance of 2.87 A given by Stomberg (1969). No further essential differences between the structures of the two compounds have been found.…”

“…The angles in the distorted tetrahedra around Ag, P(1) and P(2) vary from 96.59 (3) to 119.87 (7), 103.2 (4) to 118.6 (3) and 103.2 (4) to 116.5 (3) ° , respectively ( Ag-I-Ag angle of 83.41 (3) ° may look small, but examples are known of bridges with M-X-M angles varying from 60 to 180 ° (Cotton & Wilkinson, 1972). For example, in [Ni(en)2] [AgI212 (Stomberg, 1969), endless chains of AgI4 tetrahedra sharing edges give double I bridges with Ag-I-Ag angles of 65.54 (5) and 81.31 (5) °. The small value of 65.54 (5) ° is due to a Ni-I interaction, while the other unaffected I atom gives an Ag-I-Ag angle of 81.31 °, in good agreement with the value 83-41 (3) ° found in the present structure.…”