Effective Expansion of the Subporphyrin Chromophore Through Conjugation with <i>meso</i>‐Oligo(1,4‐phenyleneethynylene) Substituents: Octupolar Effect on Two‐Photon Absorption

Abstract

Go with the glow: A series of meso-oligo(1,4-phenyleneethynylene) substituted subporphyrins shows a significant amplification in absorption coefficient and fluorescence quantum yield as the chain length of the substituents increases (see picture). Particularly, enhancement of the two-photon absorption properties along the series can be characterized by an octupolar effect rather than a conjugation effect.