News and dates
20.12.11 - PhD Defence
On December 19, 2011 Sanchita Sengupta successfully defended her PhD thesis on "Bio-inspired Zinc Chlorin Dye Assemblies for Supramolecular Electronics". We congratulate Sanchita and wish her all the best for her future career.
19.12.11 - PhD Defence
On December 16, 2011 Hannah Bürckstümmer successfully defended her PhD thesis on "Merocyanine Dyes for Solution-Processed Organic Bulk Heterojunction Solar Cells". We congratulate Hannah and wish her all the best for her career at Merck in...
13.09.11 - Literature Seminar in Alteglofsheim
13.9.11-16.9.11 Literature Seminar in Alteglofsheim
Over the course of four days, 29 group members participated in educational and team building activities in and around Regensburg. Half of each day was devoted to lectures presented by group...
07.09.11 - ECME 2011 Barcelona, Spain
This year the 11th European Conference on Molecular Electronics (ECME 2011) took place at the AXA Auditorium and Convention Center in Barcelona. From 06th to the 10th of September our research associate Matthias Stolte and one of our PhD students,...
01.08.11 - ECUST Shanghai 2011
1.8.2011 Shanghai
After having been awarded with a visiting professorship of the Chinese Academy of Science Prof. Würthner will visit the top Chinese Universities and Research Institutions in Chemistry and Material Science in 2011 and 2012. On his...
15.07.11 - Gordon Research Conference
From the 10th to the 15th of July, two of our PhD student, Charlotte Grzeszkiewicz and Daniel Görl, had the great opportunity to participate in the Photochemistry Gordon Research Conference at Stonehill College, Easton, located close to Boston,...
Featured Recent Publications
>Bright Near-Infrared Fluorophores Based on Squaraines by Unexpected Halogen Effects
U. Mayerhöffer, B. Fimmel, F. Würthner
Angew. Chem. Int. Ed. 2012, 51, 164–167
DOI: 10.1002/anie.201107176
An unexpected halogen effect afforded novel squaraine-based bright near-infrared (NIR) fluorophores with nearly total transparency in the visible region and bright emission in the NIR region beyond 900 nm (see picture).
>Efficient Solution Bulk Heterojunction Solar Cells by Antiparallel Supramolecular Arrangement of Dipolar Donor-Acceptor Dyes
H. Bürckstümmer, E. V. Tulyakova, M. Deppisch, M. R. Lenze, N. M. Kronenberg, M. Gsänger, M. Stolte, K. Meerholz, F. Würthner
Angew. Chem. Int. Ed. 2011, 50, 11628–11632
DOI: 10.1002/anie.201105133
Donor-acceptor dyes with aminothiophene donor show ideal absorption, redox, and packing feature in organic photovoltaics. With blend of HB366:PC71BM, highly efficient solar cells were achieved with a VOC of 1.0 V, a JSC of 10.2 mA cm−2, and a power conversion efficiency of 4.5%.
>Foldamer with a spiral perylene bisimide staircase aggregate structure
V. Dehm, M. Büchner, J. Seibt, V. Engel, F. Würthner
Chem. Sci. 2011, 2, 2094–2100
DOI: 10.1039/c1sc00435b
A molecular staircase was constructed by a new foldamer concept based on intramolecular π–π-interactions of perylene bisimide dyes.
>Self-Sorting Phenomena in Complex Supramolecular Systems
M. M. Safont-Sempere, G. Fernández, F. Würthner
Chem. Rev. 2011, 111, 5784–5814. DOI: 10.1021/cr100357h
In this review, we will discuss the external variables and intrinsic factors (molecular codes) that influence the recognition or discrimination of supramolecularly interacting chemical species in solution. The comprehension of this “molecular programming” in artificial systems will define the variables that control self-sorting processes, and may ultimately contribute to a better understanding of the self-assembly pathways in natural systems.
>Impact of Molecular Flexibility on Binding Strength and Self-Sorting of Chiral π-Surfaces
M. M. Safont-Sempere, P. Osswald, M. Stolte, M. Grüne, M. Renz, M. Kaupp, K. Radacki, H. Braunschweig, F. Würthner
J. Am. Chem. Soc. 2011, 133, 9580–9591. DOI: 10.1021/ja202696d
In this work, we have explored for the first time the influence of conformational flexibility of π-core on chiral self-sorting properties of perylene bisimides (PBIs) that are currently one of the most prominent classes of functional dyes.
>Synthesis and Characterization of Optical and Redox Properties of Bithiophene-Functionalized Diketopyrrolopyrrole Chromophores
H. Bürckstümmer, A. Weissenstein, D. Bialas, F. Würthner
J. Org. Chem. 2011, 76, 2426–2432. DOI: 10.1021/jo2003117
>J-Aggregates: From Serendipitous Discovery to Supramolecular Engingeering of Functional Dye Materials
F. Würthner, T. E. Kaiser, C. R. Saha-Möller
Angew. Chem. 2011, 123, 3436–3473; Angew. Chem. Int. Ed. 2011, 50, 3376–3410. DOI: 10.1002/anie.201002307
After more than 75 years since their discovery, J-aggregates are continuing to be of great interest. This Review provides an overview on J-aggregates of various classes of dyes, including cyanines, porphyrins, phthalocyanines, and perylene bisimides, with specific emphasis on supramolecular construction principles, optical properties, and perspectives for applications.
>Diketopyrrolopyrrole as a p-channel organic semiconductor for high performance OTFTs
S.-L. Suraru, U. Zschieschang, H. Klauk, F. Würthner
Chem. Commun. 2011, 47, 1767–1769. DOI: 10.1039/c0cc04395h
A new diketopyrrolopyrrole derivative 1 exhibits excellent hole mobilities of 0.7 cm2 V–1 s–1 and a current on/off ratio of 106 under ambient conditions in bottom-gate, top-contact organic thin film transistors (OTFTs) fabricated by vacuum deposition.
wuerthner@chemie.uni-wuerzburg.de
