Calix[4]arene can recognize metals captured in the cavity by IR absorption
Calix[4]arene (C4A), composed of four phenols connected with methylene chains, has been used extensively as host molecules in supramolecular chemistry. C4A has a dominant, cone-type conformation formed by a strong hydrogen-bonded network with four OH groups (Fig. 1), and captures guest species such as molecules and ions in the cone.
![Atlas of Science. Calix[4]arene can recognize metals captured in the cavity by IR absorption](https://atlasofscience.org/wp-content/uploads/2020/10/Fig1-cone-shaped-C4A-AoS.jpg)
Fig. 1. Side and top views of cone-shaped C4A. Red, dotted lines in the top view indicate the OH•••O hydrogen bonds.
![Atlas of Science. Calix[4]arene can recognize metals captured in the cavity by IR absorption.](https://atlasofscience.org/wp-content/uploads/2020/10/Fig2-cone-shaped-C4A-AoS.jpg)
Fig. 2. The IR spectra of the M+(C4A) (M = K, Rb, and Cs) complexes. Stable structures of the M+(C4A) complexes predicted by quantum chemical calculations.
Yoshiya Inokuchi
Department of Chemistry, Graduate School of Science, Hiroshima University, Japan
Publication
Conformation of alkali metal ion-calix[4]arene complexes investigated by IR spectroscopy in the gas phase
Wada K, Kida M, Muramatsu S, Ebata T, Inokuchi Y
Phys Chem Chem Phys. 2019 Aug 21
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