Lower rim tetra-substituted and upper rim ferrocene amide calix[4]arenes: synthesis, conformation and anion-binding properties

✍ Scribed by Boosayarat Tomapatanaget; Thawatchai Tuntulani

• Publisher: Elsevier Science
• Year: 2001
• Tongue: French
• Weight: 217 KB
• Volume: 42
• Category: Article
• ISSN: 0040-4039
• DOI: 10.1016/s0040-4039(01)01722-1

✦ Synopsis

Calix[4]arenes containing ferrocene amide at the upper rim and methoxy or ethoxycarbonylmethoxy (ethyl ester) groups at the lower rim (5a, 5b and 5c) have been synthesized. It was found that tetramethoxy 5a and dimethoxy diethyl ester 5c were conformationally labile and existed in both cone and partial cone conformation in solution. Anion-binding studies by 1 H NMR titration in CDCl 3 showed that 5b bound Cl -selectively with high stability. Compound 5c formed complexes with Cl -and H 2 PO 4