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Department of Chemistry

Lund University

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The Wärnmark Group

                   

          The KW group during group excursion to Skrylle on October 1. 2018. 

Research - Main Fields

Currently, Iron Carbene Sensitizers are a big part of research in our group, where the electronic properties of iron complexes are studied and adjusted. Using strongly σ-donating N-heterocyclic carbene (NHC) ligands, the aim is to alter the energy of electronic states in iron complexes, making them potential candidates as photosensitizers in solar cells. Because of abundance and availability of iron, replacing the widely employed, scarce, ruthenium and iridium-based complexes is an exciting prospect. The challenge is to extend the lifetime of a short-lived triplet metal-to-ligand charge transfer (3MLCTexcited state by increasing the complex ligand field and destabilizing a low-lying metal-centered state (MC).

                    

               Picture: Dr. Lisa A. Fredin, Front Cover ChemSusChem 7/2016

Another project is within the field of Supramolecular Chemistry - the chemistry beyond the molecule. This means that we are using non-covalent interactions between molecules, mainly hydrogen bonds, to construct assemblies of molecules that should have new properties that are more than the sum of the individual molecules. Self-assembly is used in Nature to build up organs such as the brain from smaller components. In our group we use advanced organic chemistry to covalently build up the molecules (building blocks) we want to assemble by non-covalent interactions after designing the molecules with respect to hydrogen-bonding pattern and their spatial positions to form the desired aggregate. For this purpose we use molecular modeling and quantum mechanical calculations. Characterization of the so formed assembles in solution is challenging and a lot of effort is devoted to apply and to develop methods for their characterization, some involving advanced mathematics.

                     

               Picture: Dovilė Račkauskaitė, Front Cover JACS 33/2015

Group News

June 2019

Frederik Garvang has finished his B.Sc. diploma work with a presentation in a group meeting. Well done and best of luck in the future.

A group of students will work in the group on scholarships during the summer. All of them have previously done diploma projects in the group. Aleksander Sjörén, Carl-Eric Onema and Joel Klarén will work on the Tröger's Base project, Samuel Persson will continue his work in the iron carbene project and Alexander Braune will work with Simon on Photocatalysis. Welcome back!

Events

2019-06-25

Aleksander Sjörén will defend his diploma work on Tröger's Base which he has been working on for the last year.

2019-06-24

Carl-Eric Onema will defend his one year diploma work on Tröger's Base. 

Opponent will be Roberto Mastio.

This open presentation will take place in the CAS coffee room, starting at 10:30

2019-06-24

Samuel Persson will defend his one year diploma work in the FeCAB project. 

"Towards iron carbene based dye sensitized solar cells: synthesis of heteroleptic, donor-acceptor complexes"

Opponent will be Aleksander Sjörén.

This open presentation will take place in CAS coffee room, starting at 14:00.

Funding

      

   

Contact

Kenneth Wärnmark

Professor

E-mail:

kenneth.warnmark@chem.lu.se

Phone:

+46 (0)46-222 82 17

Postal address:

Lund University

Center for analysis and synthesis (CAS)

P.O. Box 124

SE-221 00 Lund

Sweden

Visiting address:

Kemicentrum

Naturvetarvägen 14

Lund

Internal mail:

Pick-up location 1