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Prof. Dr. Laschat
Universität Stuttgart
Pfaffenwaldring 55
D-70569 Stuttgart

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Ursula Henn
NWZ I, 5-102
+49711 685 64268
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Hänle, Johannes

Herr MSc.
Johannes Christian Hänle
PhD. Student

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Universität Stuttgart
Institut für Organische Chemie
Pfaffenwaldring 55
70569 Stuttgart
Deutschland

Fachgebiet:

Dyes • Liquid Crystals

My research focusses on materials with a combination liquid crystalline and photophysical properties. Through a systematic investigation of strong acceptor moieties, rigid chromophores, and various electron-donating groups, structure-property relationships have been investigated. The photophysical properties are strongly connected to the ground-state polarity, which can be studied by a variety of methods (UV/Vis absorption, 1H and 13C NMR, DFT calculations, and CV). The use of appropriate substituents induces liquid-crystalline behaviour, and mesogenic properties were investigated by POM, DSC and XRD investigations. By variation of molecular parameters (acceptor, chromophore, and donor), liquid-crystalline and photophysical properties can be influenced. Ideally, it will be possible to tune the mesogenic or optical properties separately. 

LinkedIn  •  ResearchGate  •   XING

Publikationen:

(8) J. C. Haenle, K. Bruchlos, S. Ludwigs, A. Köhn und S. Laschat, » Rigidified Push-pull Dyes–Tuning the Ground State Between Neutral and Cyanine Limit by Chromophore Size, Donor, and Acceptor Unit «, ChemPlusChem, 2017, published online; DOI: 10.1002/cplu.201700347.

(7) A. Obsiye, T. Wöhrle, J. C. Haenle, A. Bühlmeyer, S. Laschat, » Dendrimeric triphenylbenzenes: helical versus zig-zag arrangement in columnar mesophases «, Liquid Crystals, 2017, published online; DOI: 10.1080/02678292.2017.1360523.

(6) N. Trbojevic, J. C. Haenle, T. Wöhrle, J. Kirres, S. Laschat, » Induction of Ionic Smectic C Phases: A Systematic Study of Alkyl-linked Guanidinium-based Liquid Crystals «, Liquid Crystals, 2016, 43, 1135–1147.    

(5) T. Wöhrle, I. Wurzbach, J. Kirres, A. Kostidou, N. Kapernaum, J. Litterscheidt, J. C. Haenle, P. Staffeld, A. Baro, F. Giesselmann, S. Laschat, » Discotic Liquid Crystals «, Chemical Reviews, 2016, 116, 1139–124.

(4) K. Herz, J. Unold, J. Hänle, R. Schowner, S. Sen, W. Frey, M. R. Buchmeiser, » On the Mechanism of the Cyclopolymerization of 1,6-Hepta- and 1,7-Octadiynes by Mo-Imido Alkylidene N-Heterocyclic Carbene Catalysts «, Macromolecules, 2015, 48, 4768–4 778.                                                                               

(3) J. C. Haenle, M. Neidhardt, S. Beardsworth, J. Kirres, A. Baro, S. Laschat, » Cyanobiphenyl versus Alkoxybiphenyl: Which Mesogenic Unit Governs the Mesomorphic Properties of Guanidinium Ionic Liquid Crystals? «, Australian Journal of Chemistry, 2014, 67, 1088–1 099.                                                 

(2) M. Butschies, M. Mansueto, J. C. Haenle, C. Schneck, S. Tussetschläger, F. Giesselmann, S. Laschat, » Headgroups versus symmetry in congruent ion pairs: which one does the job in mesomorphic aryl guanidinium and aryl imidazolium sulfonates? «, Liquid Crystals, 2014, 41, 821–8 38.             

(1) M. Butschies, J. C. Haenle, S. Tussetschläger, S. Laschat, » Liquid crystalline guanidinium phenylalkoxybenzoates: towards room temperature liquid crystals via bending of the mesogenic core and the use of triflate counter ions «, Liquid Crystals, 2013, 40, 52–71.

Lebenslauf:
Date of birth 22.02.1989
Place of birth Schwäbisch Gmünd
09/99–06/07 General higher educationentrance qualification: Hans-Baldung-Gymnasium in Schwäbisch Gmünd
07/07–04/08 Alternative service in the Zentralinstitut für Klinische Chemie und Laboratoriumsmedizin, Katharinenhospital, Klinikum Stuttgart
10/08–09/13 Studies of Chemistry, University of Stuttgart
05/11–08/11 Bachelor of Science Thesis under the supervision of Prof. Sabine Laschat, Institut für Organische Chemie, University of Stuttgart
04/13–09/13 Master of Science Thesis under the supervision of Prof. Sabine Laschat, Institut für Organische Chemie, University of Stuttgart
01/14–11/17 Ph. D. Thesis under the supervision of Prof. Sabine Laschat, Institut für Organische Chemie, University of Stuttgart
07/14 Arthur-Fischer-Preis
07/16 Reisekostenstipendium der Otto-Stüber-Stiftung