Efficient Blue Phosphorescence in Gold(I)-Acetylide Functionalized Coinage Metal Bis(amidinate) Complexes.

ABSTRACT: The synthesis of linear symmetric ethynyl- and acetylide-amidinates of the coinage metals is presented. Starting with the desilylation of the complexes [{Me₃ SiC?CC(NDipp)₂ }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 }₂ M₂ ] (M=Cu, Au). The corresponding Ag complex [{(PPh₃ )AuC?CC(NDipp)₂ }₂ Ag₂ ] 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.

SUBMITTER: Feuerstein TJ 

PROVIDER: S-EPMC7756867 | biostudies-literature | 2020 Dec

REPOSITORIES: biostudies-literature