Zn(II)porphyrin helical arrays: A strategy to overcome conformational heterogeneity by host-guest chemistry

Seok Yoon Zin, Shanmugam Easwaramoorthi, Dongho Kim

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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.

Original languageEnglish
Pages (from-to)197-201
Number of pages5
JournalBulletin of the Korean Chemical Society
Issue number1
Publication statusPublished - 2008 Jan 20


All Science Journal Classification (ASJC) codes

  • Chemistry(all)

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