Full Determination of Zero Field Splitting Tensor of the Excited Triplet State of C60 Derivatives of Arbitrary Symmetry from High Field TREPR in Liquid Crystals
journal contributionposted on 23.02.2006, 00:00 by Marco Bortolus, Alberta Ferrarini, Johan van Tol, Anna Lisa Maniero
The low-lying photoexcited triplet state of a series of fullerene C60 adducts has been studied by high-field TREPR (time-resolved EPR) spectroscopy in a partially oriented phase. The fullerenes adopt a biaxial alignment, driven by the substituents, that has allowed to fully determine the ZFS and g tensors, i.e., their principal values and the orientation of the principal axes in the molecular skeleton. This has been accomplished by combining line shape analysis and theoretical prediction of molecular order. A strong dependence of the magnetic tensors on the substitution pattern has been found.
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ZFSseriespredictiondependencei.eskeletonLiquid CrystalsorientationFull DeterminationC 60 Derivativesphotoexcited triplet stateg tensorsbiaxial alignmentArbitrary SymmetryaxeZero Field Splitting TensorsubstituentphaseHigh Field TREPRfullerene C 60 adductsExcited Triplet Statesubstitution patternline shape analysisspectroscopy