STM image of triazatruxene (TAT) molecules on the Ag(111) surface (left) together with the model depicting the adsorption configuration of TAT based on the DFT calculations

C14 – Local spectroscopy of multi-spin molecules: valency distributions and magnetic properties

Funding period: 01/2016 – 12/2019

Principal investigators: Mikhail FoninRainer Winter

Scientific staff: Anja Bauer, Stefanie Breimaier, Philipp Erler, Luca Gragnaniello, Michael Linseis, Markus Maier, Steffen Oßwald, Fabian Paschke, Sabina Simon

We investigate almost planar compounds where one to three redox-active centers are connected to a central, likewise redox-active triangular core. Mixed-valent forms, where only part of the redox sites are oxidized to paramagnetic sites, will be investigated with respect to the degree of valence delocalization or electronic bistability by molecular spectroscopy in solution. The behaviour of ensembles of molecules in solution will then be compared to that of individual molecules deposited on surfaces and studied by scanning probe microscopy and spectroscopy. A further point of interest is the coupling pattern of unpaired spins and the magnetic properties of states where several paramagnetic sites are present within the same molecule.

For further information please also refer to the group websites: AG Fonin (Physics) and AG Winter (Chemistry)

List of publications

2019

  • F. Paschke, P. Erler, V. Enenkel, L. Gragnaniello and M. Fonin
    Bulk-like magnetic signature of individual Fe4H molecular magnets on graphene
    ACS Nano 13, 780 (2019) - DOI: 10.1021/acsnano.8b08184

2018

  • S. Bouvron, R. Maurand, A. Graf, P. Erler, L. Gragnaniello, M. Skripnik, D. Wiedmann, C. Engesser, C. Nef, W. Fu, C. Schönenberger, F. Paulya and M.Fonin
    Charge transport in a single molecule transistor probed by scanning tunneling microscopy
    Nanoscale 10, 1487 (2018) - DOI: 10.1039/c7nr06860c (cooperation of C13 and C14)

2017

  • L. Gragnaniello, F. Paschke, P. Erler, P. Schmitt, N. Barth, S. Simon, H. Brune, S. Rusponi, and M. Fonin
    Uniaxial 2D superlattice of Fe4 molecular magnets on graphene
    Nano Lett. 17, 7177−7182 (2017) - DOI: 10.1021/acs.nanolett.6b05105

2016

  • S. Scheerer, M. Linseis, E. Wuttke, S. Weickert, M.. Drescher, O. Tröppner, I. Ivanovic-Burmazovic, A. Irmler, F. Pauly, R.F. Winter
    Redox-Active Tetraruthenium Macrocycles Built from 1,4-Divinylphenylene-Bridged Diruthenium Complexes
    Chem. Eur. J. 22, 9574-9590 (2016) - DOI: 10.1002/chem .201601384 (cooperation of C13 and C14)

2015

  • P. Erler, P. Schmitt, N. Barth, A. Irmler, S. Bouvron, T. Huhn, U.Groth, F.Pauly, L. Gragnaniello, and M. Fonin
    Highly Ordered Surface Self-Assembly of Fe4 Single Molecule Magnets
    Nano Lett. 5, 4546–4552 (2015) - DOI: 10.1021/acs.nanolett.5b01120