Regensburg 2022 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 12: Poster 1
CPP 12.8: Poster
Montag, 5. September 2022, 18:00–20:00, P1
Spin-Based Quantum Sensing with Endohedral Fullerenes — •Marco Sommer1, Don-Sheng Guo1, Andreas Hennig1, Johann P. Klare1, and Wolfgang Harneit2 — 1Universität Osnabrück, Osnabrück, Deutschland — 2Nankai University, Tianjin, China
The endohedral fullerene N@C60 in an inhomogeneous environment is investigated with the goal to establish the N@C60 with its outstanding spin properties as a spin label for coupling experiments in biological systems at room temperature. To reveal the preservation of these spin features, the N@C60 is transferred into Triton X-100 micelles, a deep cavitand calixarene (SAC4A) as well as the cavity formed by two γ-cyclodextrins building a non-covalently bonded guest-host complex. The spectroscopic tools are based primarily on continuous wave (cw) and pulsed electron paramagnetic resonance (EPR) techniques, in addition to absorption measurements in the ultraviolet-visible light (UV/vis) range and molecular modelling with molecular dynamic (MD) simulation of the complexes. The resulting spin properties are examined with cw and pulsed EPR spectroscopy. The computational modelling and MD simulations of the complexes in combination with UV/vis spectroscopy serves for the unravelling of the arrangement. Initial experiments show a successful transfer of the highly hydrophobic N@C60 into the aqueous phase. The resulting spin-spin relaxation time T2 strongly depends on the the N@C60’s encapsulation system. Inhomogeneous environments (Triton X-100) decrease the transverse relaxation time whereas a symmetric system (γ-cyclodextrin) provides an increase in T2.