Unusual conformational control of mobile mono- and diionizable

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Unusual conformational control of mobile mono-
and diionizable calix4arene ligands by alkali
metal cations Vladimir S. Talanov, Hong-Sik
Hwang and Richard A. Bartsch Department of
Chemistry and Biochemistry, Texas Tech
University, Lubbock, Texas 79409-1061 USA
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c
b
a
1NMR spectra (aromatic region) for (a) L1H2, (b)
L1Li2, (c) L1Na2 (499.7 MHz, CDCl3, 296K).
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c
b
a
1NMR spectra (aromatic region) for (a) L1K2, (b)
L1Rb2, (c) L1Cs2 (499.7 MHz, CDCl3, 296K).
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c
b
a
Partial 1NMR spectra for (a) L1H2, (b) L1Li2, (c)
L1Na2 (499.7 MHz, CDCl3, 296K).
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c
b
a
Partial 1NMR spectra for (a) L1K2, (b) L1Rb2, (c)
L1Cs2 (499.7 MHz, CDCl3, 296K).
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?
NOESY spectrum for L6Cs in CDCl3 (499.7 MHz,
296K). Identifies signals of ArCH2Ar protons,
? identifies signal of OCH2CO protons
cross-peaks of interest are indicated by arrows.