2004
DOI: 10.1021/ol049140u
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Binding Selectivity of Cucurbit[7]uril:  Bis(pyridinium)-1,4-xylylene versus 4,4‘-Bipyridinium Guest Sites

Abstract: The binding interactions between the host cucurbit[7]uril (CB7) and a series of linear guests containing bis(pyridinium)-1,4-xylylene and/or 4,4'-bipyridinium residues were investigated by (1)H NMR spectroscopy. CB7 was found to exhibit considerable binding selectivity for bis(pyridinium)-1,4-xylylene over 4,4'-bipyridinium sites. New pseudo-rotaxane and rotaxane compounds were synthesized utilizing the host-guest interactions between CB7 and the surveyed guests. [structure: see text]

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Cited by 108 publications
(166 citation statements)
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“…The exceptional stability of the Q7•22 complex is perhaps not surprising when considering the somewhat analogous Q7•bis(pyridinium)-1,4-xylylene complex, which binds with a Kd value of 1.8 x 10 9 M -1 . 13 In the context of peptide recognition in aqueous solution, however, it is remarkable that such a stable complex can be achieved via the addition of only two heavy atoms to a peptide. carried out at 27 C in 10 mM sodium phosphate, pH 7.0, and in the presence of 100-fold excess phenylalanine as a weak competitor.…”
Section: Characterization Of Q7•tbuphe (2) and Q7•amphe (3)mentioning
confidence: 99%
“…The exceptional stability of the Q7•22 complex is perhaps not surprising when considering the somewhat analogous Q7•bis(pyridinium)-1,4-xylylene complex, which binds with a Kd value of 1.8 x 10 9 M -1 . 13 In the context of peptide recognition in aqueous solution, however, it is remarkable that such a stable complex can be achieved via the addition of only two heavy atoms to a peptide. carried out at 27 C in 10 mM sodium phosphate, pH 7.0, and in the presence of 100-fold excess phenylalanine as a weak competitor.…”
Section: Characterization Of Q7•tbuphe (2) and Q7•amphe (3)mentioning
confidence: 99%
“…Desta forma, os cucurbitandos são capazes de formar compostos de inclusão, complexos e adutos com uma enorme variedade de espécies quí-micas 35,36 . Podemos citar entre elas as aminas 12,14,34,[37][38][39] , compostos aromáticos 40,41 , heterocíclicos [42][43][44] , viologênios [44][45][46][47][48][49] , poliaminas, peptídios e aminoácidos [50][51][52] , álcoóis 50,53,54 , surfatantes 53,55 , tióis, gases como CO 2 , O 2 , Kr, N 2 e Xe 31,32,56-58 , metais, complexos e muitas outras, como corantes 59,60 e fármacos [59][60][61][62] (Tabela 2). Em termos de constantes de formação médias de caviplexos de CB [6] com um grande número de compostos, como álcoóis por exemplo, são geralmente uma ordem de grandeza superiores às obtidas com α-ciclodextrinas, mostrando que também exibem uma grande afinidade por moléculas neutras, além de maior seletividade por conta dos fatores mencionados anteriormente.…”
Section: Compostos De Inclusão Com Cucurbitandosunclassified
“…With this in mind, we are interested in the ability of inverted cucurbit[n]urils to include viologens, which are of potential use in electrochromic displays. 3 In the case of the cucurbit [7]uril system (Q [7]), work by the group of Kaifer over a decade ago reported studies on the binding interaction between Q [7] and viologen hosts. [4][5][6][7] In particular, they examined the inclusion of 4,4 0 -pyridinium dicationic guests, measured the binding constants (typically 1 Â 10 9 L mol À1 ) and investigated the effect that one electron reduction of the viologen had on the binding constants.…”
Section: Introductionmentioning
confidence: 99%
“…
The interaction between inverted cucuribit [7]uril (iQ [7]) and a series of symmetric viologen derivatives bearing aliphatic substituents of variable length, namely dicationic dialkyl-4,4 0 -bipyridinium guests where the alkyl is CH 3 (CH 2 ) n with n ¼ 0 to 6, has been studied in aqueous solution by
…”
mentioning
confidence: 99%