Selective response: Two new cation-responsive two-photon absorption (2PA) dyes containing phenylazacrown-6 moieties and 1,2,3-triazole units as π-linkers are described. One of the dyes (see picture) without cations exhibits a 2PA cross-section of 190 GM. Through binding of cations, the 2PA cross-section is reduced or enhanced.
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