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Intensely Photoluminescent Diamidophosphines of the Alkaline‐Earth Metals, Aluminum, and Zinc
Ist Teil von
Angewandte Chemie (International ed.), 2018-10, Vol.57 (43), p.14265-14269
Auflage
International ed. in English
Ort / Verlag
Germany: Wiley Subscription Services, Inc
Erscheinungsjahr
2018
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
The positively charged and weakly polarizable s‐block metals commonly do not usually have phosphine ligands in molecular complexes. Herein, we report mono‐ and dinuclear small diamidophosphine complexes of the alkaline‐earth metals Mg, Ca, and Sr, which were prepared from simple precursors and a phosphine‐functionalized diamine ligand N,N‐bis(2‐(diphenyl‐phosphino)phenyl)ethane‐1,2‐diamine (PNHNHP). The alkaline‐earth metal based complexes [(PNNP)Mg]2 and [(PNNP)M(thf)3] (M=Ca, Sr), exhibit unusual coordination spheres and show bright fluorescence, both in the solid state and in solution. For comparison, the even stronger luminescent Al and Zn complexes [(PNNP)Zn]2 and [(PNNP)AlCl] were prepared. Emission lifetimes in the nanosecond range and high photoluminescence quantum yields up to 93 % are observed at room temperature.
Unusual coordination spheres: As phosphine ligands are not commonly used in s‐block chemistry, the preparation of mono‐ and dinuclear diamidophosphine complexes of the alkaline‐earth metals, aluminum, and zinc gives rise to unusual coordination spheres. All compounds feature bright fluorescence both in the solid state and in solution, as well as high quantum yields up to 93 % at room temperature.