Conor S. Smith, K. R. Mann
Oct 7, 2009
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Chemistry of Materials
Abstract
We have shown that crystals of a number of emissive copper compounds of the form [Cu(NN)2]X (X = BF4−, tfpb−) (where NN = 1,10-phenanthroline (phen), 2,9-dimethyl-1,10-phenanthroline (dmp), 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (bdmp), 2,9-diisopropyl-1,10-phenanthroline (dipp), 2,9-ditert-butyl-1,10-phenanthroline (dbp); tfpb− = tetrakis(bis-3,5-trifluoromethylphenylborate) are oxygen sensors, if they contain void space. All of the tfpb− salts were found to be oxygen sensors reinforcing the idea that bulky counterions can produce void space and obviate the need for a support material in solid-state photoluminescent oxygen sensors. The reponse time for the X = tfpb− and NN = dipp complex was measured to be fast (280 ms (95% of final value)). The first solid-state quantum yields and lifetimes are reported for the [Cu(NN)2]X systems and are found to be approximately 10 times larger than those observed in solution-state measurements. The linear Stern−Volmer plots with highly reproducible Ksv constant...