In this review article, we have described various strategies to increase the efficiency of two-photon absorption process of porphyrin related molecular systems. While 18-π electronic aromatic porphyrin monomers exhibit relatively small two-photon absorption cross-section values, the perturbation of electronic nature of porphyrins by substituting electron donating-accepting moieties, π-conjugated peripheral susbtituents, linking the porphyrins in π-conjugated manner using π-bond linkages, increasing the electronic coupling by controlling the dihedral angles between the neighboring porphyrin planes, and forming completely fused structures between the adjacent porphyrins leads to the significant enhancement in the two-photon absorption cross-section values. We have demonstrated that the charge transfer character as well as the elongation of π-conjugatin pathway in a unidirectional way is the key factor to increase the overall efficiency of the two-photon absorption processes. At the same time, it is equally important to maintain the rigid scaffold structures of porphyrin assemblies to ensure the efficient π-conjugation pathway throughout the whole molecular framework. In this regard, this review will be a guideline for future directions in the investigations of the two-photon absorption properties of porphyrin related molecular systems and their practical applications.
|Number of pages||16|
|Journal||Journal of Photochemistry and Photobiology C: Photochemistry Reviews|
|Publication status||Published - 2008 Mar|
Bibliographical noteFunding Information:
This research was financially supported by the Star Faculty program of the Ministry of Education and Human Resources Development (MEHRD) of Korea (DK). The work at Kyoto University was supported by a grant-in-aid (A no. 19205006) (AO). K.K.S. and J. M. L. acknowledge the fellowship of the BK21 program from the MEHRD of Korea.
Dongho Kim was born in Seoul, Korea in 1957. He received a BS in chemistry from Seoul National University (1980) and a PhD from Washington University (1984). After postdoctoral research at Princeton University, he joined the Korea Research Institute of Standards and Science (1986). He moved to Yonsei University (2000), where he is a Professor of Chemistry. Since 1997, he has been leading the Center for Ultrafast Optical Characteristics Control through the National Creative Research Initiatives Program supported by the Korea Science Engineering Foundation. Currently he is the director of Institute for BioNano Molecular Assemblies supported by the BK 21 program of the Ministry of Education and Human Resources Development of Korea. He received the Scientist of the Month Award (1999), the Sigma–Aldrich Award (2005), the Korea Science Award in Chemistry (2006), and the Star Faculty Award (2006). He was selected as Underwood Professor at Yonsei University (2007) and is also a fellow of the Korea Advanced Academy of Science and Technology.
All Science Journal Classification (ASJC) codes
- Physical and Theoretical Chemistry
- Organic Chemistry