Luminescence properties of salts of the [Pt(trpy)Cl](+) and [Pt(trpy)(MeCN)](2+) chromophores: Crystal structure of [Pt(trpy)(MeCN)](SbF6)(2)

The crystal structure of [Pt(trpy)(MeCN)](SbF6)(2), where trpy denotes 2,2':6',2 ''-terpyridine, shows that the platinum complex packs as a monomer; however, the (3) pi-pi emission of the solid occur at surprisingly long wavelengths at room temperature. At lower temperatures new, shorter-wavelength maxima appear. Of the known sails with the composition [Pt(trpy)Cl]A, the A = SbF6- system is the lone example that exhibits a temperature-independent emission maximum. In these platinum(II) terpyridines, energy migration to defects or trap sites is one of the phenomena responsible for the temperature dependence of the solid-state emission spectrum. IT trap emission is evident, the low-temperature spectral data are most representative of the bulk material.