Modulation of intermolecular interactions in new pyrimidine-porphyrin system as two-photon absorbing photosensitizers

New porphyrins-pyrimidine systems have been synthesized for photodynamic therapy applications. Indeed, such association through acetylenic bond should improve two-photon absorption properties. As expected an intermolecular interaction between photosensitizers has been observed but more surprisingly it seems to favor two-photon absorption.