Abstract
The electron paramagnetic resonance (EPR) spectrum measured at 240 GHz of the lowest excited triplet state of the free-base tetra-phenyl porphyrin (H2-TPP) molecule is presented. The high frequency that is employed allows for the full resolution of theg-anisotropy (2.00354(2), 2.00272(15), and 2.00194(5) forx, y, andz zero-field axes respectively), and the obtained values are compared to those of other porphyrin-based systems. These results are one of the first addressing theg-anisotropy in the photoexcited state of porphyrins. The usefulness of high-field transient EPR in elucidating not only the principal values of theg-tensor but also the orientation of theg-tensor principal axes with respect to those of the zero-field splitting tensor in porphyrin disordered systems is also discussed.
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van Tol, J., Brunel, L.C. & Angerhofer, A. Transient EPR at 240 GHz of the excited triplet state of free-base tetra-phenyl porphyrin. Appl. Magn. Reson. 21, 335–340 (2001). https://doi.org/10.1007/BF03162412
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DOI: https://doi.org/10.1007/BF03162412