Abstract
The rapid growth of the click chemistry concept produced a wide variety of functional polymers. In this research field, polymeric ion sensors, which can recognize specific metal cations or anions, have mainly been synthesized by the Cu(I)-catalyzed azide-alkyne cycloaddition (CuAAC). However, due to several disadvantages suggested for the CuAAC, the development of new types of click chemistry reactions has recently started. Among them, it was found that the high-yielding addition reactions between electron-rich alkynes and cyano-based acceptors offer promising application possibilities as polymeric chemosensors. The donor-acceptor type products feature intense charge-transfer bands in the visible region. The recognition of some specific metal cations or anions resulted in well-defined visible colorimetric changes in the optical spectra.
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