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- W2148895722 abstract "Abstract Treatment of 5,11,17,23‐tetrakis[( p ‐carboxyphenyl)azo]‐25,26,27,28‐tetrahydroxy calix[4]arene ( 2 ) with HCl in DMF or NaOH in MeOH produced 5,11,17,23‐tetrakis[( p ‐carboxyphenyl)azo]‐25,26,27,28‐tetrahydroxycalix[4]‐arene·4DMF (2·4DMF) and 5,11,17,23‐tetrakis[( p ‐carboxyphenylsodium)azo]‐25,26,27,28‐tetrahydroxycalix[4]‐ arene ( 3 ), respectively, which were characterized by elemental analysis, IR, UV‐vis, 1 H NMR and 13 C NMR. An X‐ray analysis of 2·4DMF revealed that its calix[4]arene core adopts a flattened cone conformation in which opposed phenyl groups take parallel or sharply inclined positions. The intra‐ and intermolecular hydrogen‐bonding interactions and the π···π interactions form a 2D hydrogen‐bonded wavelike network. Compound 2 had a unique reversible color change in a wide pH range from 1 to 13.5 and showed interesting pH sensing properties." @default.
- W2148895722 created "2016-06-24" @default.
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- W2148895722 date "2010-10-01" @default.
- W2148895722 modified "2023-09-27" @default.
- W2148895722 title "5,11,17,23‐Tetrakis[(<i>p</i>‐carboxyphenyl)azo]‐25,26,27,28‐tetrahydroxy Calix[4]arene: Crystal Structure and pH Sensing Properties" @default.
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- W2148895722 doi "https://doi.org/10.1002/cjoc.201090306" @default.
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