Photophysical properties of {[Ag(CN)2]−}2 complexes trapped in a supramolecular electron-acceptor organic framework

Abstract

The organic acceptor 1,1′-bis-(2,4-dinitrophenyl)-4,4′-bipyridinium (DNP²⁺) reacts with dicyanoargentate to form a supramolecular complex with the general formula: {[Ag(CN)₂]₂DNP}·2H₂O. The photophysical properties of this complex were determined using solid-state luminescence experiments including luminescence lifetime measurements. Luminescence of the dicyanoargentate dimers is observed both by direct excitation of the silver dimers as well as excitation of the DNP²⁺ followed by indirect non-radiative energy transfer to the silver dimer units for emission. The structures themselves were characterized using X-ray crystallography. The results are compared to those from the previously studied {[Au(CN)₂]₂DNP}·4H₂O system.