Switch-on luminescence detection of steroids by tris(bipyridyl)ruthenium(ii) complexes containing multiple cyclodextrin binding sitesElectronic supplementary information (ESI) available: characterisation of compounds 2 and 4, and a Job-plot for the binding of the N,N′-dinonyl-4,4′-bipyridinium bromide to 2. See http://www.rsc.org/suppdata/cc/b0/b000271m/

Abstract

A luminescent ruthenium(II) complex with six cyclodextrin binding sites is shown to switch off its emission upon binding of N,N′-dinonyl-4,4′-bipyridinium bromide and to recover luminescence upon displacement of the bipyridinium ion by a steroid.