title: Outer-sphere association of p-sulfonatothiacalix[4]arene and tetrasulfonatomethylated calix[4]resorcinarene with cobalt(III) tris(dipyridyl): the effect on the spectral and electrochemical properties of the latter.
abstract: According to the 1H NMR and X-ray data, the outer-sphere association of [Co(dipy)3]3+ with cyclophanic anions p-sulfonatothiacalix[4]arene and tetrasulfonatomethylated calix[4]resorcinarene is accompanied by the inclusion of the dipyridyl moiety of the former into the cavities of the cyclophanic anions in aqueous and aqueous-DMSO solutions and in the solid state. The first-step dissociation of p-sulfonatothiacalix[4]arene does not change the inclusion mode, but the increase in DMSO content leads to a shallower inclusion of [Co(dipy)3]3+. The electrochemical property changes of [Co(dipy)3]3+ with both receptors undergoing ion pairing indicate the stabilization of the tris(dipyridyl) cobalt complexes in lower oxidation states. The effect of the cyclophanic anions on the cyclic voltammograms of [Co(dipy)3]3+ correlates with the efficiency of binding of the latter with tetrasulfonatomethylated calix[4]resorcinarene and p-sulfonatothiacalix[4]arene.
authors.affiliation: A. E. Arbuzov Institute of Organic & Physical Chemistry, Arbuzov Street, 8, 420088 Kazan, Russia. asiya@iopc.knc.ru
authors.forename: Asiya R
authors.initials: AR
authors.lastname: Mustafina
authors.forename: Viktoriya V
authors.initials: VV
authors.lastname: Skripacheva
authors.forename: Aidar T
authors.initials: AT
authors.lastname: Gubaidullin
authors.forename: Shamil K
authors.initials: SK
authors.lastname: Latipov
authors.forename: Asiya V
authors.initials: AV
authors.lastname: Toropchina
authors.forename: Vitaly V
authors.initials: VV
authors.lastname: Yanilkin
authors.forename: Svetlana E
authors.initials: SE
authors.lastname: Solovieva
authors.forename: Igor S
authors.initials: IS
authors.lastname: Antipin
authors.forename: Alexander I
authors.initials: AI
authors.lastname: Konovalov