Zusammenfassung
This work describes the synthesis, crystal structure, and detailed photophysical studies of [n-Bu₄N][Pt(4,6-dFppy)(CN)₂] (n-Bu = n-butyl, 4,6-dFppy = (4',6'-difluorophenyl)pyridinate). The material can easily be prepared in high yield and purity by the reaction of [Pt(4,6-dFppy)(H-4,6-dFppy)Cl], [n-Bu₄N]Cl, and KCN in CH₂Cl₂. Because of the bulky counterion [n-Bu₄N]⁺, Pt-Pt interactions, which ...
Zusammenfassung
This work describes the synthesis, crystal structure, and detailed photophysical studies of [n-Bu₄N][Pt(4,6-dFppy)(CN)₂] (n-Bu = n-butyl, 4,6-dFppy = (4',6'-difluorophenyl)pyridinate). The material can easily be prepared in high yield and purity by the reaction of [Pt(4,6-dFppy)(H-4,6-dFppy)Cl], [n-Bu₄N]Cl, and KCN in CH₂Cl₂. Because of the bulky counterion [n-Bu₄N]⁺, Pt-Pt interactions, which frequently lead to aggregate formation, are suppressed in the solid state. Thus, monomer emission is observed. The phosphorescence quantum yield of the neat powder amounts to Φ(PL) = 60 % at a ambient temperature and decays with 19 μs. In tetrahydrofuran (THF) solution, on the other hand, the emission decay time is with 0.26 μs distinctly shorter, and the quantum yield is very low. By means of emission decay time studies in frozen THF and investigations of the highly resolved single crystal emission at 1.2 K, we can assign the emitting T₁ state of the compound as being largely of ligand centered (³LC, ³ππ*) character. The observed differences of the emission properties of the neat powder compared to the fluid solution are rationalized with an energy stabilization of quenching dd* states in solution because of molecular distortions and/or bond elongations.
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