Four binol based pyrrole carboxamide chiral receptors has been synthesized and effectively used as a Chirality Conversion Reagent (CCR) for underivatized amino acids. Three points of interactions take place for the conversion process. They are the reversible imine formation, the internal resonance assisted Hydrogen Bonding (RAHB) and the additional hydrogen bonds between the amino acids and the heterocylic moiety of the pendant groups. The conversion efficiency of all the receptors was found to be comparable with those of the receptors reported earlier.
A New Rhodamine B Derivative as a Colorimetirc Chemosensor for Recognition of Copper(II) Ion. -The new chemosensor (I) shows a high selectivity towards Cu 2+ and it can be also used at neutral conditions (pH 7). Other coexisting metal ions show no significant response and do not significantly influence the reversible Cu 2+ recognition process of (I) (detection limit 2.8·10 -7 M). -(TANG*, L.; LI, F.; LIU, M.; NANDHAKUMAR, R.; Bull. Korean Chem.
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