Hexameric and tetrameric porphyrin nanorings, Z6T6 and Z4T4, were synthesized in 53% and 14% yields, respectively, by the Sonogashira-type self-oligomerization of porphyrin monomer 1 using hexadentate template T6 and tetrapyridylporphyrin template T4. Template-free nanorings Z6 and Z4 were also prepared. The femtosecond transient absorption measurements revealed fast excitation energy hopping (EEH) along these nanorings with hopping rates of 2-5 ps. Treatment of Z6 with chiral template CT6 gave Z6CT6 showing circular dichroism (CD) and circularly polarized luminescence (CPL) in the absorption and fluorescence regions of Z6, respectively, which indicates chirality transfer from CT6 to Z6.
Bibliographical noteFunding Information:
This work was supported by JSPS KAKENHI (Grant Number 15K13745) and Izumi Science and Technology Foundation. The work at Yonsei University was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2020R1A5A1019141).
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All Science Journal Classification (ASJC) codes
- Colloid and Surface Chemistry