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- W3198867821 abstract "The synthesis of calix[4]- and -[6]arene derivatives P6(H)22+·(Cl-)2, V4(H)24+·(Cl-)2·(I-)2, and V6(H)24+·(Cl-)2·(I-)2 bearing N-linked pyridinium (P) and viologen (V) units at the upper rim is described here. A rare example of an anionic conformational template is reported for p-pyridiniumcalix[6]arene P6(H)22+, which adopts a 1,3,5-alternate conformation in the presence of chloride anions. Derivatives P6(H)22+·(Cl-)2, V6(H)24+·(Cl-)2·(I-)2, and V4(H)24+·(Cl-)2·(I-)2 show a negative solvatochromism, while their UV-vis acid-base titration evidenced that upon addition of a base, new bands appear at 487, 583, and 686 nm, respectively, due to the formation of betainic monodeprotonated species P6(H)1+, V6(H)13+, and V4(H)13+. These new bands were attributable to the intramolecular charge-transfer (CT) transition from the phenoxide to the pyridinium or viologen moiety and were responsive to the presence of cations. In fact, the band at 487 nm of P6(H)1+ was quenched in the presence of a hard Li+ cation, and the color of its acetonitrile solution was changed from pink to colorless upon addition of LiI. Consequently, this derivative can be considered as a useful host for the recognition and sensing of lithium cations." @default.
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- W3198867821 date "2021-09-01" @default.
- W3198867821 modified "2023-10-02" @default.
- W3198867821 title "Chromogenic Properties of <i>p</i>-Pyridinium- and <i>p</i>-Viologen-Calixarenes and Their Cation-Sensing Abilities" @default.
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- W3198867821 doi "https://doi.org/10.1021/acs.joc.1c01687" @default.
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