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http://dx.doi.org/10.5012/bkcs.2008.29.1.197

Zn(II)porphyrin Helical Arrays: A Strategy to Overcome Conformational Heterogeneity by Host-Guest Chemistry  

Yoon, Zin-Seok (Center for Ultrafast Optical Characteristics Control and Department of Chemistry, Yonsei University)
Easwaramoorthi, Shanmugam (Center for Ultrafast Optical Characteristics Control and Department of Chemistry, Yonsei University)
Kim, Dong-Ho (Center for Ultrafast Optical Characteristics Control and Department of Chemistry, Yonsei University)
Publication Information
Bulletin of the Korean Chemical Society / v.29, no.1, 2008 , pp. 197-201 More about this Journal
Abstract
Conformational heterogeneity of directly linked multiporphyrin arrays with larger molecular length retards their utilities in practical applications such as two-photon absorption and molecular photonic wire. In this regard, here we adopted a way to overcome the conformational heterogeneity through hydrogen bonding by selective binding of meso aryl substituents of porphyrins (host) with urea (guest) to form helical structure. Using steady-state and time-resolved spectroscopy, we observed the enhanced fluorescence quantum yield by ~1.8 to 2.4 times, enhanced anisotropy values and the disappearance of fast fluorescence decay component in the host-guest helical forms. In addition, the enhanced nonlinear optical responses of helical arrays infer the extended inter-porphyrin electronic coupling due to a significant change in dihedral angle between the neighboring porphyrin moieties. The current host-guest strategy will provide a guideline to improve the structural homogeneity of the photonic wire.
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