Topics in calixarene chemistry

Gutsche, C. David; Alam, Iftikhar; Iqbal, Muzaffar; Mangiafico, Thomas; Nam, Kye Chun; Rogers, J. S.; See, Keat Aun

doi:10.1007/bf01112783

Cited by 31 publications

(13 citation statements)

References 8 publications

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“…A protonated triethylamine molecule [N(1)Eta] is connected by a strong hydrogen bond to one of the uranyl O The conformation of the calixarene can be described using the symbolic representation proposed recently by Ugozzoli & Andreetti (1992) as C2(+-,-+)4, where C2 is the Schoenflies symbol for the point symmetry of the molecule and the + and -signs describe the sequence of signs of the qo and X torsion angles around the macrocycle (given in Table 2). This conformation is identical to the one, described as a 'pleated loop', observed for the free calixarene in the solid state (Gutsche, Gutsche & Karaulov, 1985;Ugozzoli & Andreetti, 1992) and also in some mononuclear complexes (Harrowfield, Ogden, Richmond & White, 1991), but different from the 'propeller-like' or 'crown' conformations of the bimetallic complexes already described (Hofmeister et al, 1989;Furphy et al, 1987;Harrowfield et al, 1989Harrowfield et al, , 1991c. The configuration of the macrocycle may be determined, not only by the nature and preferred environment of the complexed metal ion, but also by the number of deprotonated phenolic O atoms.…”

supporting

confidence: 79%

A Bimetallic Complex Between Uranyl and p-tert-Butylcalix[8]arene

Thuéry¹,

Keller²,

Lance³

et al. 1995

Acta Crystallogr C

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supporting

confidence: 79%

A Bimetallic Complex Between Uranyl and p-tert-Butylcalix[8]arene

Thuéry¹,

Keller²,

Lance³

et al. 1995

Acta Crystallogr C

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“…Calix[n]arenes are an important class of macrocyclic molecules that can be easily prepared by the base-catalysed condensation of p-substituted phenols with formaldehyde [1]. This family of macrocyclic receptors is consisting of cyclic arrays of phenol moieties linked by methylene groups.…”

Section: Introductionmentioning

confidence: 99%

Self-assembled calix[4]arenequinhydrone on the platinum electrode by cathodic reduction of calix[4]arenediquinone

Youchret-Zallez¹,

Besbes-Hentati²,

Bouvet

et al. 2011

J Incl Phenom Macrocycl Chem

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The electrochemical reduction of di(methoxyp-tert-butyl)calix [4]arenediquinone led to its calix[4]arenedihydroquinone. The presence of both in the solution refers to the generation of calix[4]arenequinhydrone charge-transfer complex at the electrode surface through a donor/acceptor process type. Self-assembled adlayers of calix[4]arenequinhydrone was obtained by partial electrochemical reduction. Electrochemical deposition of the last form was achieved on the platinum disk electrode at -1.16 V versus SCE (saturated calomel electrode) in aprotic solution by cathodic reduction of the starting substrate. The deposit was first characterized by cyclic voltammetry (CV) in electrolytic solution and then in electrolyte support solution and finally in a ferricyannure solution. The self-assembled product was characterized by MALDI-TOF Mass and IR spectroscopy techniques. It was observed too by SEM technique. Calix[4]arenequinhydrone is observed on the electrode surface as hexangular prisms with a length of few micrometers.

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“…This led us to the conclusion that the product we had isolated was 5, confirming that Route B must be favoured over Route A, and that the starting compound 1 prefers the ''pleated loop'' conformation. [10] It is known that cyclic calixarene phosphates are dynamic systems. [11,12] The aromatic rings can exchange their positions from the ''up'' position to the ''in'' position and from the ''down'' position to the ''in'' position and vice versa.…”

Section: Resultsmentioning

confidence: 99%