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Anion recognition studies were performed with triazole‐appended thiourea conjugates of calix[6]arene (i.e., compound 6L) by absorption and 1H NMR spectroscopy by using nineteen different anions. The composition of the species of recognition was derived from ESI mass spectrometry. The absorption spectra of compound 6L showed a new band at λ=455 nm in the presence of F− due to a charge transfer from...
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