Very Large Infrared Two-Photon Absorption Cross Section of Asymmetric Zinc Porphyrin Aggregates: Role of Intermolecular Interaction and Donor-Acceptor Strengths

Zuhail Sainudeen and Paresh Chandra Ray Department of Chemistry, Jackson State University, Jackson, MS, USA, 39217 Acknowledgment: We thank the NSF-PREM Grant #DMR-0611539 for generous funding. We also thank Mississippi Center for Super Computer Resource (MCSR), University of Mississippi, Oxford, MS, for the generous use of their computational facilities. Two-PhotonAbsorptionCrossSection.jpg One of the long-standing challenges is the development of organic compounds, which exhibits a large value of the 2PA cross section at wavelength(s) above 700 nm. We have designed a series of D-A Zn-porphyrin aggregates that possess exceptionally large Two Photon Absorption (TPA) cross sections at the desirable fundamental wavelengths of 1.1-1.5 m, which can be highly suitable candidates for the applications in biological imaging and photon dynamic therapy. (published in J. Phys. Chem. A, J. Phys. Chem. A, 2006, 110, 12342).