Chemistry - A European Journal p. 888 - 899 (2020)
Update date:2022-08-28
Topics:
Vieira, Paulo
Miranda, Margarida Q.
Marques, Igor
Carvalho, Sílvia
Chen, Li-Jun
Howe, Ethan N. W.
Zhen, Carl
Leung, Claudia Y.
Spooner, Michael J.
Morgado, Bárbara
da Cruz e Silva, Odete A. B.
Moiteiro, Cristina
Gale, Philip A.
Félix, Vítor
The anion-binding and transport properties of an extensive library of thiophene-based molecules are reported. Seventeen bis-urea positional isomers, with different binding conformations and lipophilicities, have been synthesized by appending α- or β-thiophene or α-, β-, or γ-benzo[b]thiophene moieties to an ortho-phenylenediamine central core, yielding six subsets of positional isomers. Through 1H NMR, X-ray crystallography, molecular modelling, and anion efflux studies, it is demonstrated that the most active transporters adopt a pre-organized binding conformation capable of promoting the recognition of chloride, using urea and C?H binding groups in a cooperative fashion. Additional large unilamellar vesicle-based assays, carried out under electroneutral and electrogenic conditions, together with N-methyl-d-glucamine chloride assays, have indicated that anion efflux occurs mainly through an H+/Cl? symport mechanism. On the other hand, the most efficient anion transporter displays cytotoxicity against tumor cell lines, while having no effects on a cystic fibrosis cell line.
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