Efficient Blue Phosphorescence in Gold(I)-Acetylide Functionalized Coinage Metal Bisamidinate Complexes

Chemistry : a European Journal
Peter W RoeskyManfred M Kappes

Abstract

The synthesis of linear symmetric ethynyl- and acetylide- amidinates of the coinage metals is presented. Starting with the desilylation of the complexes [Me3SiC≡CC(NDipp)2}M2] (Dipp = 2,6-diisopropylphenyl) (M = Cu, Au) it is demonstrated that this compound class is suitable to serve as a versatile metalloligand. Deprotonation with n-butyllithium and subsequent salt metathesis reactions yield symmetric tetranuclear gold(I) acetylide complexes of the form [{(PPh3)AuC≡CC(NDipp)2}2M2] (M = Cu, Au). The corresponding Ag complex [{(PPh3)AuC≡CC(NDipp)2}2Ag2] was obtained by a different route via metal rearrangement. All compounds show bright blue or blue-green microsecond long phosphorescence in the solid state, hence their photophysical properties were thoroughly investigated in a temperature range of 20 - 295 K. Emission quantum yields of up to 41% at room temperature were determined. Furthermore, similar emissions with quantum yields of 15% were observed for the two most brightly luminescent complexes in thf solution.

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Citations

Feb 10, 2021·Chemical Reviews·Raquel P Herrera, M Concepción Gimeno
Nov 23, 2021·Chemical Communications : Chem Comm·Milena DahlenPeter W Roesky

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Methods Mentioned

BETA
NMR
X‐ray

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