Helical binuclear Co complexes of pyriporphyrin analogue for sensing homochiral carboxylic acids |
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Authors: | Jun-ichiro Setsune Miku KawamaTakeshi Nishinaka |
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Institution: | Department of Chemistry, Graduate School of Science, Kobe University, Nada-ku, Kobe 657-8501, Japan |
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Abstract: | A hybrid macrocycle composed of two bipyridines and two dipyrrins gave biscobalt complexes of figure eight macrocycle conformation with κ2-carboxylate ligands and water ligands at the axial sites. The axial acetate ligands of the biscobalt complex are readily exchanged with carboxylates of α-hydroxyl acids and α-amino acids. The chiral center of the axial carboxylate ligands controls the helical handedness of the macrocycle as evidenced by a typical CD couplet at 550 nm. The substitution labile nature of the biscobalt complex plays a key role for helical chirality induction on the macrocycle upon co-ordination of chiral carboxylate anions. |
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Keywords: | Pyriporphyrin Expanded porphyrin Chirality sensing Chirality transfer Amino acid sensor |
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