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Non-covalent calix[4]pyrrole-chloranil complex, a new class of supramolecular assembly, is reported. The formation of the complex is mainly attributed to the charge-transfer interactions between calix[4]pyrrole with electron-rich pyrrole rings and the electron-deficient chloranil subunit. As potential colorimetric anion sensors, the charge-transfer aggregation may be used for effective and selective...
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