Phosphorus(V) Tetraazaporphyrin with an Intense, Broad CT Band in the Near-IR Region

Org Lett. 2024 Mar 8;26(9):1931-1935. doi: 10.1021/acs.orglett.4c00298. Epub 2024 Feb 28.

Abstract

In phosphorus tetraazaporphyrins (PTAPs), the Q- and charge-transfer (CT) bands appear as a result of configuration interaction between their excited states. On the basis of this concept, a PTAP with an intense, broad CT band in the near-IR region has been rationally designed and realized by introducing eight diphenylaminophenyl (dPAP) groups. The order of the CT and Q-bands in ascending energy was supported by magnetic circular dichroism (MCD) spectroscopy and theoretical calculations. An intense two-photon absorption was also found in the deep near-IR region.