The Anthranil Core as a π-Conjugated Bridge in the Synthesis of Molecular Photosensitizers.

Molecular photosensitizers based on the anthranil core were synthesized through a six-step linear synthesis featuring a Suzuki coupling at the C7 position and a controlled C3-H arylation. The introduction of donor and acceptor groups allowed the synthesis of unsymmetrical photosensitizers that were then investigated, revealing different spectroscopic and optoelectronic properties. Transient spectroscopy of excited species indicated that placing the acceptor at C7 and the donor group at C3 altered the energy levels around the anthranil core, making these dyes attractive for photovoltaic applications.