Abstract
In this study, we prepared 2 by treating NBD chloride (4chloro-7-nitrobenz-2-oxa-1,3-diazole) with 1 at room temperature in the presence of potassium carbonate in tetrahydrofuran as shown in Scheme 1 and investigated the absorption and emission behaviors of 2 in the presence of various metal ions. The UV-vis absorption behaviors of 2 (100 μM) in 50% acetonitrile in water in the presence of various metal ions (100 equiv) are shown in Figure 1. In the absence of metal ions, 2 shows an intense absorption at 484 nm, which is assignable to the intramolecular charge transfer (ICT) transition from the N atom of the 3,9-dithia-6-azaundecane moiety to the nitro group of the NBD moiety of 2. 9 No significant change in the absorption of 2 was observed upon the
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