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- W1993889078 abstract "Lower rim O-methyl, -n-butyl, and n-octadecyl calix[4]arenes bearing p-phosphonic acid groups on the upper rim have been prepared in high yield, compounds 12−14. Where possible, the compounds have been characterized in the solid state using X-ray diffraction, or as the precursor phosphate esters or a cesium salt. The cone conformation ethyl phosphate ester for the octadecyl compound crystallizes in a bilayer 39.1 Å thick, which approaches the 40 Å of biological membranes. The 1,3-alternate cone conformation of the cesium salt of the O-methyl phosphonic acid has a metal ion coordinated to two methoxy groups, four O−P (two from neighboring calixarenes), and two η3-C3 moieties from two 1,3-disposed aromatic rings. MALDI-TOF spectra of compounds 12−14 show successive peaks corresponding to 15, 33, and 16 calixarene units, which is consistent with the intramolecular H-bonding capabilities of the diprotic phosphonic acid groups where the calixarenes are arranged into layers, including bilayers." @default.
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- W1993889078 date "2009-05-18" @default.
- W1993889078 modified "2023-10-16" @default.
- W1993889078 title "Organization of Lower Rim <i>O</i>-Alkylated <i>p</i>-Phosphonic Acid Calix[4]arenes" @default.
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- W1993889078 doi "https://doi.org/10.1021/cg900315h" @default.
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