Diporphyrin tweezer for multichannel spectroscopic analysis of enantiomeric excess

Abstract

Chiral 1,1’-binaphthyl-linked diporphyrin ‘tweezers’ (R)-1/(S)-1 and the corresponding zinc(II) complexes (R)-2/(S)-2 were prepared as chiral host molecules, and their utility for chiral analyses (especially enantiomeric excess (ee) determinations) were evaluated. Tris(1-n-dodecyl)porphyrins were used for the first time as the interacting units. Host capabilities of the diporphyrin tweezers were investigated by titrations with (R,R)- and (S,S)-cyclohexane-1,2-diamine (CHDA). The host molecules could be used as multichannel probes of ee by using UV-vis, circular dichroism (CD), fluorescence emission and ¹H nuclear magnetic resonance (¹H-NMR) methods. Chiral configurations could also be differentiated using CD or ¹H-NMR spectroscopy. All three optical techniques give good resolution of ee with reasonable sensitivity considering the low concentrations used (ca. 10⁻⁶ mol·L⁻¹). The ee determination of CHDA enantiomers using NMR spectroscopy is also possible because of the reasonably well separated resonances in the case of (R,R)- and (S,S)-CHDA. Non-metallated (R)-1/(S)-1 hosts could not be used to detect chiral information in a strongly acidic chiral guest. This work demonstrates the utility of 1,1’-binapthyl-linked chiral hosts for chiral analysis of ditopically interacting enantiomers.

Key words： porphyrin dimer; chirality; enantiomeric excess; CD; fluorescence

Acknowledgements

This work was partly supported by World Premier International Research Center Initiative, MEXT, Japan. The authors are grateful to Japan Society for the Promotion of Science (JSPS) for a JSPS Fellowship (to D.T.P.). This work was also partially supported by JSPS KAKENHI (Coordination Asymmetry) Grant No. JP16H06518, JSPS KAKENHI Grant No. 19K05229 and CREST, JST Grant No. JPMJCR1665. This work was partly financially supported by the National Science Foundation (Grant No. 1401188 to FD). The authors thank the Catalysis and Sensing for our Environment network for essential networking opportunities [48].

Electronic Supplementary Material

ƒSupplementary material is available in the online version of this article at https://doi.org/10.1007/s11705-019-1869-1 and is accessible for authorized users.

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