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

Abstract

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.