Probing solution behaviour of metallosupramolecular complexes using pyrene fluorescence

摘要

A new method for assessing the topology of metallosupramolecular assemblies using pyrene-appended ligands is reported. Two potentially tetradentate ligands containing one (L ~1) and two (L ~2) terminal pyrene moieties were synthesised and their complexes with Cu ~+ and Cd ~(2+) were characterised. Photophysical measurements demonstrate that in [Cu _2(L ~1) _2] ~(2+), [CdL ~1] 2+ and [Cu _2(L ~2) _2] ~(2+) the emission spectra are dominated by monomeric emission but in the cadmium complex of L ~2 (where the pyrene units are in close proximity) a quenching of the luminescence coupled with weak emission at 540 nm is indicative of excimer formation.