Monotopic and heteroditopic calix [4] arene receptors as hosts for pyridinium and viologen ion pairs: a solution and solid-state study

…, A Pochini, A Secchi, C Massera, F Ugozzoli

Index: Pescatori, Luca; Arduini, Arturo; Pochini, Andrea; Secchi, Andrea; Massera, Chiara; Ugozzoli, Franco Organic and Biomolecular Chemistry, 2009 , vol. 7, # 18 p. 3698 - 3708

Full Text: HTML

Citation Number: 43

Abstract

The binding efficiency of a series of monotopic (1–2) and heteroditopic (3–4) calix [4] arene- based receptors has been evaluated in chloroform solution toward N-methylpyridinium ion pairs using NMR and UV/vis spectroscopic techniques. These experiments provided evidence that, due to a positive cooperative effect, the presence of a phenylurea H-bond donor group on the upper rim of the calix [4] arene macrocycle increases the recognition ...