Prof. Stephan Landgraf
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Research Topics
Weak effects on electron transfer reactions
Magnetic field-dependent reaction yield, e.g. Triplet-triplet-annihilation (TTA)
Working with variable ƞ or εr keeping all other properties constant
Working with constant solvent parameters at variable temperatures
Properties and applications of tertiary mixtures
Photochemical Methods
Application of semiconductor light sources
Fluorescence standards (IUPAC project)
Theory of electron transfer reactions
Pure and applied electrochemistry
Electrochemical methods, e.g. photo-modulated voltammetry
Kinetics in electrochemistry
Electrochemistry in ionic liquids
Current Work Group Poster load here.
For Batchelor and Master thesis at TU Graz contact Prof. Landgraf via email (follow the link at the end of this page).
Recent Publications
S. Landgraf, G. Grampp, K. Rasmussen, T. Suwunwong, P. Choto, "The use of a tertiary solvent mixture to study solvent dynamic effects in the photoinduced electron transfer reaction of excited singlet pyrene and indole", New J. Chem., 2024, DOI: 10.1039/D3NJ05255A.
S. Jockusch, E. Ozcelik Kazancioglu, N. Karaca, N. Arsu, S. Landgraf, and P.R. Ogilby, "Thioxanthone Dioxide Triplet States Have Low Oxygen Quenching Rate Constants", J. Phys. Chem. B 2024, 128, 244-249. DOI: 10.1021/acs.jpcb.3c06077
A. Wankmüller, M. Berghold, S. Landgraf, "Individual tuning of solvent parameters - From organic solvents to ionic liquids", J. Mol. Liquids 2021, 333, 115880. DOI: 10.1016/j.molliq.2021.115880
M. Sambol, K. Ester, S. Landgraf, B. Mihaljevic, M. Cindric, M. Kralj, N. Basaric, "Competing photochemical reactions of bisnaphthols and their photoinduced antipro-liferative activity", Photochem. Photobiol. Sci. 2019, 18, 1197-1211. DOI: 10.1039/c8pp00532j
M. Berghold, J. Bächle, S. Landgraf, G. Grampp, "A Binary Mixture of Ionic Liquids as a New Approach for an Experimental Diffusion Correction in the Study of Activated Processes.", ChemPhysChem. 2017, 18, 1288-1292. DOI: 10.1002/cphc.201601347
T.X. Nguyen, S. Landgraf, G. Grampp, "Kinetics of photoinduced electron transfer reactions of ruthenium(II) complexes and phenols, tyrosine, N-acetyl-tyrosine and tryptophan in aqueous solutions measured with modulated fluorescence spectroscopy", J. Photochem. Photobiol. B: Biology 2017, 166, 28-34. DOI: 10.1016/j.jphotobiol.2016.11.007
J. Sobek, H. Rehrauer, S. Schauer, D. Fischer, A. Patrignani, S. Landgraf, J. Korlach, R. Schlapbach, "Single-molecule DNA hybridisation studied by using a modified DNA sequencer: a comparison with surface plasmon resonance data", Methods Appl. Fluoresc. 2016, 4, 015002. DOI: 10.1088/2050-6120/4/1/015002
Invited article "Year of Light 2015", S. Landgraf, "Time-Resolved Fluorescence HPLC Detection Using Semiconductor Light Sources: Principles and Applications", Chem. Eng. Technol. 2016, 39, 175-182. DOI: 10.1002/ceat.201500152
Equipment
Weak effects on electron transfer reactions
Measurement of the fluorescence signal (I) or of dI/dB as a function of the magnetic field B
TCSPC in the normal mode/inverted mode/MSA in the magnetic field (-200 to 6000 G)
Cooled PMT detectors (down to -30 °C)
Temperature-controlled sample holder (5 to 70 °C)
Measurement of the solvent dielectric constant, real part, oscillator circuit, or direct capacitance method
Measurement of the molecular dipole moment (via temperature dependent dielectric constant)
Measurement of the solvent density and viscosity using automated methods
Measurement of the refractive index, real part, 589 nm or others (all 5 to 70 °C)
Photochemical Methods
Modulation fluorometry (LD/LED, excitation 310 nm to NIR)
TCSPC in the inverted mode (LD/LED, excitation 267 to 635 nm) and MSA
Cable or digital delay (2x SRS DG535)
Fluorimeter with cooled detector (FluoroMax)
All methods with temperature-controlled sample holders (5 to 70 °C)
External fluorescence measurements via light guides (-30 to +300 °C)
Cooled PMT, Mini-PMT, and MCP detectors (down to -30 °C)
Physical light intensity measurements with calibrated detectors
Detector system intensity calibration with calibrated lamp (W, 250 to 2000 nm)
Detector system wavelength calibration with calibrated lamp (Hg-Ar, 185 nm to NIR)
UV/VIS spectrophotometer Hach Lange DR5000
Diode array spectrometer (180 to 880 nm, Ocean Optics Flame)
Pure and applied electrochemistry
(Mini-)cyclic voltammetry and rotating disc electrodes (0.5 to 50 ml, 5 to 70 °C)
Pt, Au, and GC working electrodes, VersaStat 3 potentiostat
Impedance measurements using µAutoLab III/FRA2
Oxygen sensor for high-purity gases (Lambda)
Oxygen sensor for high concentrations (Clark)
pH, redox, and conductivity measurements (5 to 70 °C)
Aqueous and non-aqueous with internal and external reference electrodes
Hoffmann voltameter
Spectroelectrochemistry (currently under renovation)
Electrochemistry in ionic liquids (volume down to less than 100 µl)
Current and former Coworkers
Patcharanan Choto (Post-Doc)
Martin Berghold (Master)
Josua Bächle (PhD)
Alexander Wankmüller (PhD)
Sabine Richert (Master)
Martin Justinek (PhD)
Nararak Leesakul (PhD)
Arnulf Rosspeintner (PhD)
Daniel Kattnig (PhD)
Gonzalo Angulo (PhD)
Claudia Muresanu (Post-Doc)
Kenneth Rasmussen (PhD)
Jens Sobek (Post-Doc)
Dominique Niethammer (Post-Doc)
tbc.
(last stay), partially co-supervised with Prof. Grampp
Advanced Courses at TU Graz
Energy (635.072)
Chemistry of the atmosphere (635.074)
Pure and applied electrochemistry (635.075)
Modern aspects of chemical kinetics (CHE.351)
Advanced methods for condensed-phase investigations (CHE.339+340)
Memberships
GDCh, GÖCH, Bunsen Society, VDI, EPA, IUPAC subcommittee photochemistry
Chairman of EPA in Austria
More info at TU Graz can be found here.