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 3π−π*
emission of the solid occurs at surprisingly long
wavelengths
at room temperature. At lower temperatures new, shorter-wavelength
maxima appear. Of the known salts 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. If trap emission is
evident, the low-temperature spectral data are most representative of
the bulk material.
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