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Positions and Theses

Bachelor´s theses and research internships



We offer positions for bachelor´s theses and research internships. Below is a selection of reseach fields and contact persons:

Field: Fluorine chemistry, superacids and strong oxidisers


(In)organic fluorine chemistry with mainly volatile compounds, catalytically or photochemically induced reactions of small molecules

Preparative work: inert work in vacuum, gas phase chemistry, Schlenk technique


In my field of research I am investigating strong methylation agents and superacids on the basis of teflate compounds. I am especially focusing on the synthesis of reactive cations, their stabilisation with weakly coordinating anions and their characterisation. Due to the high air and moisture sensibility of these substrates, working under inert gases as well as using Schlenk techniques is of high importance. If you are interested in this topic, you can send me an e-mail or visit me in my lab (room U409).


My research focuses on the study of gold fluorides in high oxidation states with organic substituents. Different substitution reactions shall be performed on those highly reactive compounds in order to enhance their scope of functionalizations.

In case you are interested in working under inert conditions, our working group and myself are the right place for you. If you are not afraid to work with extremely reactive compounds, such as elemental fluorine or anhydrous HF, you can get to know working techniques using a metal line and vessels made of PFA. Apart from the spectroscopic characterization (NMR, IR, Raman), QC calculations can be performed.

In case you are interested in doing your Bachelor’s thesis or a research internship with me I would love to hear from you. You can come to my office (room U408) or send me an e-mail (marlon.winter@fu-berlin.de). Depending on your preferences, the focus of the preparative work can be set onto one of the above mentioned techniques.



Field: Halogens (chlorine, bromine, iodine), polyhalides, electrochemistry and batteries


On the one hand, my research is concerned with the development of new electrolytes with potential applications in redox flow batteries. The focus is on the synthesis and electrochemical characterization of ionic liquids based on chloromanganates. My second topic is the investigation of polyinterhalides or polypseudohalides. This research focuses on the synthesis of novel anions which are formed based on interhalogens such as bromine chloride (BrCl) or the pseudointerhalogen cyanogen bromide (BrCN).

If you want to gain experience in inorganic synthesis and various analysis methods (Raman, DSC/TG, conductometry, etc.) and do not shy away from rather uncommon chemicals such as BrCl and BrCN, contact me or just drop by in U406.


Interested in helping design a new battery from the ground up, utilize a repertoire of chemicals for electrochemical application, and gather experience in the reemerging field of inorganic electrochemistry? Room temperature ionic liquids (RTIL) are salts that remain liquid at room temperature and have wide variety of application because of their thermal and electrochemical stability. ILs can also be tuned by slight variations in their chemical structure. My studies concentrate on the development of halogen-based IL metallates, specifically that of the bromidostannates, [Cat.][SnBr3/5], and of the chloridomanganates, [Cat.]2[MnCl4/5], their characterization through Raman, EPR, and UV-vis spectroelectrochemistry, and viability in application purposes such as batteries or metal recycling. By working with groups from the University of Freiburg and Fraunhofer ISE, we were able to conceptualize and develop a redox-flow battery system based on [MnCl4]2– (patent pending). If you are interested in the idea of conceptualizing and synthesizing new IL metallates, testing them for electrochemical strengths, and utilizing them in real world applications, consider taking up a laboratory position with me.

If interested, please contact me either per e-mail (Deutsch oder Englisch) or drop on by my office, Fabeckstr. 34-36, room U406. I look forward to meeting you!


My research concerns the synthesis and characterisation of chlorine fluorine based polyhalide anions. Focus is put on their applications as reagents in organic and inorganic synthesis. Due to the high reactivity of some compounds involved (e.g. F2) working with Schlenk techniques is required.


  • Contact: Patrick Voßnacker

Around 75 million tons of elemental chlorine are produced each year. Due to the high reactivity and vapor pressure the storage of chlorine, for an extended period of time, is hardly possible. Therefore, I’m working on chemical chlorine storage materials which enable a save storage of chlorine. In addition, I’m interested in possible applications and reactivities of these storage materials. If you are interested in inorganic synthesis and unusual characterization methods (Raman, gas phase IR, XRD) please let me know or just come by my office in room U406.


My research is focused on the synthesis and characterization of novel ozonides and fluorobromates. In order to modulate their properties, different cations with e.g. perfluorinated groups have to be synthesized. If you are interested in a cross-over between inorganic fluorine chemistry and organic synthesis you are welcome to send me a mail or just come by in U412.



Field: Matrixisolationspectroscopy and quantumchemical calculations


I'm investigating novel transition metal species which I prepare by laser-ablation of metals at cryogenic tempratures at 4K. These metal atoms react with elemental fluorine or other reactive gases like OF2 to form so far unknown and very labile oxyfluoride species. These compounds will be isolated in solid neon or argon and characterized by matrix-isolation spectroscopy.


I am focusing on exploring novel reaction products from laser-ablated transition metal atoms with fluorine or other reactive gases in excess noble-gas matrices (Ne, Ar, etc.) under cryogenic conditions. The isolated species are detected by infrared matrix-isolation spectroscopy. Moreover, I make use of computational technique to analyze the molecular structures and orbitals of observed species.


Master´s theses


Master´s theses can also be taken in the above mentioned areas. Additionally, individually designed theses can be discussed.


For further information please contact members of the Riedel group (Fabeckstr. 34/36, 4th floor) or Prof. Sebastian Riedel.

PhD theses


Are you interested in a PhD theis in halogen and fluorine chemistry?

We are always looking for talented researchers for ambitious projects to synthesise novel compounds and tackle tricky questions.

Selection of fields:

  • compounds in high oxidation states
  • strong oxidiser
  • superacids
  • weakly coordinating anions/cations
  • polyhalogencations

For further information please contact members of the Riedel group (Fabeckstr. 34/36, 4th floor) or Prof. Sebastian Riedel.