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Towards improved lanthanide complexes for two‐photon mediated singlet oxygen production: The very large intersystem crossing efficiency results from the combination and interplay of bromine atom substituents, placed along the π‐conjugated antenna, and a heavy rare‐earth element coordinated to a central TACN ligand. Two‐photon‐activated singlet oxygen generation leads to tumor cell death, which illustrates...
Two trispicolinate 1,4,7‐triazacyclonane (TACN)‐based ligands bearing three picolinate biphotonic antennae were synthetized and their Yb3+ and Gd3+ complexes isolated. One series differs from the other by the absence (L1)/presence (L2) of bromine atoms on the antenna backbone, offering respectively improved optical and singlet‐oxygen generation properties. Photophysical properties of the ligands,...
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