(Chemical Equation Presented) A benzopyrane-fused hexaphyrin, 2, was prepared by simple heating of hexaphyrin 1 in acetic acid. Fused hexaphyrin 2 features a molecular twist, a distinct diatropic ring current, a large HOMA value, a large negative NICS value, and a large two-photon absorption (TPA) cross section even at room temperature, all of which support the M bius aromaticity of 2. To the best of our knowledge, 2 is the first macrocycle that acquires distinct M bius aromaticity without any assistance from metal coordination, temperature control, or protonation.
All Science Journal Classification (ASJC) codes
- Colloid and Surface Chemistry