Synthesis and structural characterisation of some 1:1:2 complexes of silver(I) compounds with triphenylpnictides and “ethylenediamine”, [(Ph₃E)(N-en)Ag(N-en-N')₂Ag(N-en)(EPh₃)]²⁺(X⁻)₂

Colourless crystalline adducts obtained by the crystallization of various silver(I) compounds in 1:1 M proportions with EPh₃ (E = P, As, Sb) from 1,2-diaminoethane (ethylenediamine) (en ≡ H₂N(CH₂)₂NH₂) have been structurally characterized by room temperature single crystal X-ray studies as 1:1:2 AgX: EPh₃: en adducts. The array of compounds is isomorphous, triclinic, P1¯, a ~ 8.5, b ~ 9.2, c ~ 16.9 Å, α ~ 86.6, β ~ 80, γ ~ 65.5°, Z = 1 dimer, being ionic [(Ph₂E)(N-en)Ag(N-en-N')₂Ag(N-en)(EPh₃)]²⁺(X⁻)₂, with binuclear centrosymmetric cations containing four-coordinate silver; the nitrogen component of the latter N₃AgE array is made up of a pair of N from two bridging en groups and, remarkably, one N from unidentate N-en. Compounds have been spectroscopically and structurally characterized for E = P, X = Cl, Br; E = As, X = Cl, Br; E = Sb, X = Cl, Br, NO₃. Bond distances and angles are compared with previous report on literature for AgX: en adducts.