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Intensely Photoluminescent Diamidophosphines of the Alkaline‐Earth Metals, Aluminum, and Zinc
Author(s) -
Bestgen Sebastian,
Schoo Christoph,
Neumeier B. Lilli,
Feuerstein Thomas J.,
Zovko Christina,
Köppe Ralf,
Feldmann Claus,
Roesky Peter W.
Publication year - 2018
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201806943
Subject(s) - photoluminescence , phosphine , diamine , alkaline earth metal , zinc , chemistry , luminescence , inorganic chemistry , metal , fluorescence , polarizability , ligand (biochemistry) , polymer chemistry , materials science , molecule , organic chemistry , catalysis , biochemistry , physics , receptor , optoelectronics , quantum mechanics
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.