| Popis: |
The emissions from the 2-pyridyl- and 2-pyridinium-substituted platinum-1,2-enedithiolate complexes, L 2 Pt{S 2 C 2 (2-pyridyl(ium))(R)} where L=PPh 3 , PPh 2 Me, PPhMe 2 , P(propyl) 3 and L 2 =dppm, dppe, and dppp were studied in DMM (DMF–CH 2 Cl 2 –MeOH, 1:1:1, v/v/v) glasses at 77 K. All of the pyridyl-substituted complexes have an emission between 18,600 and 17,900 cm −1 with pronounced 1200 cm −1 vibronic structure. The lifetimes of the pyridyl-substituted complexes are 216–350 μs. The pyridinium-substituted complexes have emissions in the range of 16,600–16,100 cm −1 with less resolved vibronic structure than their pyridyl counterparts. The lifetimes of the pyridinium-substituted complexes are 158–290 μs. The emission at 77 K from both the pyridyl- and pyridinium-substituted complexes contrasts with the room temperature studies where only selected pyridinium complexes were emissive. |
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