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Featured researches published by Herwig Buchholz.


Inorganic Chemistry | 2013

Efficient near-UV emitters based on cationic bis-pincer iridium(III) carbene complexes.

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

Triethylsilyl cations. Authors' reply

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

Catalytic titanium (IV) oxide, mediated geminal symmetric dialkylation of carboxamides

Herwig Buchholz; Urs Welz-Biermann


Archive | 1999

Compositions for the treatment and prevention of neurological and pathopsychological diseases

Herwig Buchholz; Jerzy Meduski


Archive | 1999

Method for producing luteolin and luteolin derivatives

Herwig Buchholz; Ralf Rosskopf; Alice Lichtenberg; Christine Kraus


Archive | 2012

DEVICE AND METHOD FOR TREATMENT OF CELLS AND CELL TISSUE

Ewald Aydt; Herwig Buchholz; Junyou Pan


Archive | 1999

FORMULATIONS HAVING AN ANTIVIRAL ACTION

Herwig Buchholz; Annette Wagner; Christine Kraus; Jerzey D. Meduski


Archive | 2007

Ascorbic acid derivatives, use thereof for the functionalization of matrices

Thomas Rudolph; Philipp Buehle; Herwig Buchholz


Archive | 2004

Flavonoid complexes with cyclodextrins

Corinna Wirth; Ralf Rosskopf; Herwig Buchholz


Archive | 2000

Composition comprising isoquercetin and ascorbic acid in a sustained release form

Herwig Buchholz; Jerzy Meduski

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