Abstract
The photoexcited triplet state of two porphyrinoids, H2TTP and a Cd complex of Texaphyrin (Cd-TxP), oriented in liquid crystals were examined by time-resolved electron paramagnetic resonance (EPR) spectroscopy as a function of temperature. The low probability of molecular tumbling in the liquid crystalline phase allows the detection of triplets by fast EPR, at temperatures (300 K) which are above the hosts’ melting points, and where the fluid properties of the matrices are maintained. Line shape and kinetic analyses of the triplet spectra provide data on spin relaxation rates, interchromophore interactions, and on the dynamic behavior of the liquid crystalline hosts, driven by the external magnetic field.
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