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Carbenaporphyrins: A Missing Ligand in N-Heterocyclic Carbene Chemistry
preprintrevised on 27.08.2020, 10:13 and posted on 27.08.2020, 13:05 by Theo Maulbetsch, Doris Kunz
The successful synthesis of a carbenaporphyrin ligand based on carbazole and triazolylidene (CTP) is reported. Instead of a macrocyclic aromatic or antiaromatic character, the aromaticity of each heterocyclic moiety is preserved, which results in optical properties different from porphyrins, e.g. fluorescence. In Li+ and Sc3+ complexes the ligand reveals striking geometric similarity to porphyrins, but is stronger electron donating.