TY - JOUR
T1 - Various strategies for highly-efficient two-photon absorption in porphyrin arrays
AU - Kim, Kil Suk
AU - Lim, Jong Min
AU - Osuka, Atsuhiro
AU - Kim, Dongho
PY - 2008/3
Y1 - 2008/3
N2 - 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.
AB - 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.
KW - π-Conjugation pathway
KW - Charge transfer
KW - Complete planar structure
KW - Dihedral angle control
KW - Porphyrin arrays
KW - TPA cross section
KW - Two-photon absorption
UR - http://www.scopus.com/inward/record.url?scp=43149109465&partnerID=8YFLogxK
U2 - 10.1016/j.jphotochemrev.2008.01.001
DO - 10.1016/j.jphotochemrev.2008.01.001
M3 - Review article
AN - SCOPUS:43149109465
SN - 1389-5567
VL - 9
SP - 13
EP - 28
JO - Journal of Photochemistry and Photobiology C: Photochemistry Reviews
JF - Journal of Photochemistry and Photobiology C: Photochemistry Reviews
IS - 1
ER -