Hetero Face-to-Face Porphyrin Array with Cooperative Effects of Coordination and Host-Guest Complexation

Yusuke Chiba; Maning Liu; Yasuhiro Tachibana; Tetsuaki Fujihara; Yasushi Tsuji; Jun Terao

doi:10.1002/asia.201700738

Hetero Face-to-Face Porphyrin Array with Cooperative Effects of Coordination and Host-Guest Complexation

Chem Asian J. 2017 Aug 4;12(15):1900-1904. doi: 10.1002/asia.201700738. Epub 2017 Jul 3.

Authors

Yusuke Chiba¹, Maning Liu², Yasuhiro Tachibana², Tetsuaki Fujihara¹, Yasushi Tsuji¹, Jun Terao³

Affiliations

¹ Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto, 615-8510, Japan.
² School of Engineering, RMIT University, Bundoora, VIC, 3083, Australia.
³ Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo, Tokyo, 153-8902, Japan.

PMID: 28544526
DOI: 10.1002/asia.201700738

Abstract

We successfully synthesized a hetero face-to-face porphyrin array composed of ZnTPP and RuTPP(DABCO)₂ (TPP: 5, 10, 15, 20-tetraphenylporphyrin, DABCO: 1,4-diazabi-cyclo[2.2.2]octane) in 2:1 molar ratio. A cyclic Zn porphyrin dimer (ZnCP) was also used as the host molecule for the Ru porphyrin. In the latter, the Ru-DABCO bonding in RuTPP(DABCO)₂ was stabilized by the host-guest complexation. Reaction progress kinetic analysis of the ligand substitution reaction of RuTPP(DABCO)₂ and that in ZnCP revealed the stabilization mechanism of the Ru-DABCO bonding. Photoinduced electron transfer (PET) from the Zn porphyrin to the Ru porphyrin was observed in the porphyrin array. The host-guest stabilization of unstable complex for construction of a donor-acceptor-donor structure is expected to be a new method for an artificial photosynthesis.

Keywords: artificial photosynthesis; coordination bonding; donor-acceptor systems; host-guest systems; photoinduced electron transfer; porphyrin.