Herwig Buchholz
Merck & Co.
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Inorganic Chemistry | 2013
Noviyan Darmawan; Cheng-Han Yang; Matteo Mauro; Matthieu Raynal; Susanne Heun; Junyou Pan; Herwig Buchholz; Pierre Braunstein; Luisa De Cola
We report on the photophysical studies of two cationic near-UV emitters based on bis-pincer Ir(III) carbene complexes: [Ir(nBu)(C(NHC)(Me)CC(NHC))2]X, where Ir(nBu)(C(NHC)(Me)CC(NHC)) is (4,6-dimethyl-1,3-phenylene-κC(2))bis(1-butylimidazol-2-ylidene) and X = I(-) or PF6(-)). The compounds are highly emitting in deaerated CH3CN solution with emission maxima at 384 and 406 nm, and photoluminescence quantum yields of 0.41 and 0.38, for [Ir(nBu)(C(NHC)(Me)CC(NHC))2]I and Ir(nBu)(C(NHC)(Me)CC(NHC))2]PF6, respectively. In order to gain deeper understandings into their structural and electronic features, as well as to ascertain the nature of the excited states involved into the electronic absorption processes, density functional theory (DFT) and time-dependent DFT (TD-DFT) calculations have been performed on the ground and excited states of the closely related complex [Ir(Me)(C(NHC)(Me)CC(NHC))2](+). In the solid state, an emission at low energy is observed (λ(max) = 500 nm) for both complexes. However, the intensity of the emission at high energy versus the intensity of the new emission at low energy is dependent on the nature of counterions. The origin of this emission is not completely clear, but the experimental data point to the formation of trapping sites induced by aggregation processes involving the interaction between the cationic emitter and the counterion.
Science | 1994
L. Pauling; George A. Olah; Golam Rasul; Xing-Ya Li; Herwig Buchholz; Graham Sandford; G. K. Surya Prakash; J. B. Lambert; Zhizhong Zhang; C. A. Reed; Zuowei Xie
Archive | 2002
Herwig Buchholz; Urs Welz-Biermann
Archive | 1999
Herwig Buchholz; Jerzy Meduski
Archive | 1999
Herwig Buchholz; Ralf Rosskopf; Alice Lichtenberg; Christine Kraus
Archive | 2012
Ewald Aydt; Herwig Buchholz; Junyou Pan
Archive | 1999
Herwig Buchholz; Annette Wagner; Christine Kraus; Jerzey D. Meduski
Archive | 2007
Thomas Rudolph; Philipp Buehle; Herwig Buchholz
Archive | 2004
Corinna Wirth; Ralf Rosskopf; Herwig Buchholz
Archive | 2000
Herwig Buchholz; Jerzy Meduski