A new fluorogenic mono-ionizable calix[4]arene dansylcarboxamide as a selective chemosensor of soft metal ions, Tl+ and Hg2+
作者:Vladimir S. Talanov、Ebony D. Roper、Nicole M. Buie、Galina G. Talanova
DOI:10.1016/j.tetlet.2007.09.043
日期:2007.11
A new fluorogenic calix[4] arene containing one pendent N-dansylcarboxamide group has been synthesized. The ligand demonstrates selective optical recognition of Tl+ and Hg2+ in solvent extraction from aqueous solutions with high content of Na+. Complexation of Tl+ and Hg2+ produces contrasting changes in the fluorescence spectrum of this sensor. Partial cone is the dominant calixarene conformation in the complex with Tl+. (C) 2007 Elsevier Ltd. All rights reserved.
Directing the Cation Recognition Ability of Calix[4]arenes toward Asymmetric Phase-Transfer Catalysis
作者:Nicola Alessandro De Simone、Rosaria Schettini、Carmen Talotta、Carmine Gaeta、Irene Izzo、Giorgio Della Sala、Placido Neri
DOI:10.1002/ejoc.201700912
日期:2017.10.10
the first time in asymmetric phase-transfercatalysis. The binding affinities of a series of chiral α-methylbenzylamine-derived calix[4]arene-amides toward Na+ guest have been determined by 1H NMR spectroscopic titration experiments. The good apparent association constant values are consistent with the macrocycles' catalytic efficiency in the asymmetric alkylation reaction of N-(diphenylmethylene)glycine
Unusual conformational control of mobile mono- and diionizable calix[4]arene ligands by alkali metal cations† ‡
作者:Vladimir S. Talanov、Hong-Sik Hwang、Richard A. Bartsch
DOI:10.1039/b101232k
日期:——
are also controlled by the identity of the complexed metal ion. The Li+ salts prefer the cone conformation, while for the Na+ and K+ salts more than two significantly populated conformations are evident. Remarkably, Cs+ and Rb+ salts prefer a partial cone conformation, which provides the possibility for the metal ion to have three π-interactions with the arene units of the calix[4]arene moiety and a coulombic