Calix[5]arene-Based Heteroditopic Receptor for 2-Phenylethylamine Hydrochloride
作者:Claudia Gargiulli、Giuseppe Gattuso、Claudia Liotta、Anna Notti、Melchiorre F. Parisi、Ilenia Pisagatti、Sebastiano Pappalardo
DOI:10.1021/jo802777v
日期:2009.6.5
Novel (1,2-3,5)-calix[5]arene-bis-crown-3 and (1,3)-calix[5]arene-crown-3 derivatives, bearing one or three ureido moieties at the lower rim, respectively, have been synthesized and investigated as heteroditopic receptors for inorganic and organic salts. Tris-ureido-calix[5]arene-crown-3 10, in particular, efficiently binds 2-phenylethylamine hydrochloride (PEA center dot HCl) as a spatially separated ion pair.
Calix[5]crown-3-based heteroditopic receptors for n-butylammonium halides
作者:Calogero Capici、Rita De Zorzi、Claudia Gargiulli、Giuseppe Gattuso、Silvano Geremia、Anna Notti、Sebastiano Pappalardo、Melchiorre F. Parisi、Fausto Puntoriero
DOI:10.1016/j.tet.2010.05.021
日期:2010.7
(1,3)-Calix[5]arene-crown-3 derivatives 1a and 1b, bearing either three n-butylureido or 1-naphthylureido moieties at the lower rim, respectively, have been synthesised. Their cationic and anionic binding domains have been investigated by a combination of 1D- and 2D-NMR, UV/vis absorption and fluorescence and ESIMS techniques. Complexation data show that the attachment of 1-naphthyl groups at the lower rim of calix[5]crown-3 1b dramatically increases its anion-binding ability over the n-butyl-bearing derivative 1a. Overall, both 1a and 1b act as highly efficient heteroditopic receptors for n-butylammonium halides and in so doing bind these salt species as spatially-separated ions much more effectively than the single ionic components. The X-ray crystal structure of the pivotal tris-[2-(2-chloroethoxy)ethoxy]-calixcrown precursor 2 is also reported. (C) 2010 Elsevier Ltd. All rights reserved.