Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Oligothiophenes containing recognition groups

In 1995, Swager et al. synthesized the first calixarene-coupled diiodinated bithiophene, which afforded copolymer 2.166 (Chart 1.36) by Stille-type cross-coupling with distannylated 3,3 -bis(methoxyethoxy) bithiophene [263]. Selective recognition of Na+ ions was studied by UV-Vis spectroscopy and cyclic voltammetry. After addition of 0.5 mMNa+, cyclic voltammetric measurements showed a positive shift of the oxidation potential of about -1-100 mV with a simultaneous dramatic decrease in conductivity. This finding was attributed to an electrostatic effect of the Na+ ions and reduced electron-donating ability of the sodium bound oxygen atoms of the calixarene. [Pg.53]

Crown ether-functionalized calixarene 2.168 (Chart 1.36) in which two bithiophene units were attached at the termini of a calixarene moiety was prepared by a similar procedure to that described above for 2.167 [Pg.53]

Sannicolb et al. synthesized cyclopentadithiophene (CPDT)-functionalized calixarene moieties 2.170 and [Pg.55]

171 (Chart 1.36) [267]. Compound 2.170 was prepared by alkylation of CPDT with 1,3-dibromopropane in the presence of -BuLi at —70 °C, followed by reaction with a calix [4]arene in basic medium, and [Pg.55]

The first series of oligothiophenes functionalized with 12-crown-4 (2.174 n = 0, 1) and 18-crown-6 (2.175) via flexible alkoxy spacers were reported by Bauerle etal. (Chart 1.37) [270, 271]. The oligomers were synthesized in 66, 48 and 72% yield, respectively, by reaction of co-brominated alkyl(oligo)thiophenes and 12-crown-4-methanol or 18-crown-6-methanol using tetrabutylammonium [Pg.55]


See other pages where Oligothiophenes containing recognition groups is mentioned: [Pg.53]    [Pg.53]   


SEARCH



Oligothiophene

Oligothiophenes

© 2024 chempedia.info