Dalton Transactions (Print Edition) 2012-02-07

Probing solution behaviour of metallosupramolecular complexes using pyrene fluorescence.

Nicola M Cox, Lindsay P Harding, Jennifer E Jones, Simon J A Pope, Craig R Rice, Harry Adams

Index: Dalton Trans. 41(5) , 1568-73, (2012)

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Abstract

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.