Linear bis-Coordinate Silver(I) and Iodine(I) Complexes with R3R2R1NTertiary Amines.

Abstract

Homoleptic [L-I-L]⁺ iodine(I) complexes (where L is a R3R2R1N tertiary amine) were synthesized via the [L-Ag-L]⁺ → [L-I-L]⁺ cation exchange reaction. In solution, the amines form [R3R2R1N-Ag-NR1R2R3]⁺ silver(I) complexes, which crystallize out from solution as the meso-[L-Ag-L]+complexes, as characterized by X-ray crystallography. The subsequent [L-I-L]⁺ iodine(I) analogues were extremely reactive and could not be isolated in the solid state. Density Functional Theory (DFT) calculations were performed to study the Ag⁺-N and I⁺-N interaction energies in silver(I) and iodine(I) complexes, with the former ranging from -80 to -100 kJmol-1 and latter from -260 to -279 kJmol-1. The X-ray crystal structures revealed Ag+···Cπ and Ag+···H-C short contacts between the silver(I) cation and flexible N-alkyl/N-aryl groups, which are the first of their kind in such precursor complexes.