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Efficient Blue Phosphorescence in Gold(I)‐Acetylide Functionalized Coinage Metal Bis(amidinate) Complexes
Author(s) -
Feuerstein Thomas J.,
Seifert Tim P.,
Jung André P.,
Müller Rouven,
Lebedkin Sergei,
Kappes Manfred M.,
Roesky Peter W.
Publication year - 2020
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202002466
Subject(s) - acetylide , phosphorescence , chemistry , deprotonation , quantum yield , photochemistry , luminescence , metal , salt (chemistry) , microsecond , yield (engineering) , organic chemistry , materials science , fluorescence , ion , physics , optoelectronics , quantum mechanics , astronomy , metallurgy
The synthesis of linear symmetric ethynyl‐ and acetylide‐amidinates of the coinage metals is presented. Starting with the desilylation of the complexes [{Me 3 SiC≡CC(NDipp) 2 } 2 M 2 ] (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 [{(PPh 3 )AuC≡CC(NDipp) 2 } 2 M 2 ] (M=Cu, Au). The corresponding Ag complex [{(PPh 3 )AuC≡CC(NDipp) 2 } 2 Ag 2 ] 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.