Utilizing a pH-Sensitive Dye in the Selective Fluorescent Recognition of Sulfateстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 марта 2017 г.
Аннотация:A receptor containing amidopyrrole binding subunits
and free amino groups, conjugated to a naphthalimide
dye, has been designed and synthesized. The intrinsic selectivity
of the binding motif for phosphate present in DMSO
completely disappears in 10% DMSO aqueous buffer at
pH 3.6, at which the receptor is protonated. The electrostatic
interactions between the receptor and an anion start to dominate, thus
leading to selectivity for sulfate. The ability
of the HSO4- anion to transfer the proton to the amino
group during the recognition event suppresses the photoinduced
electron transfer (PET) on the dye, resulting in a selective
turn-on fluorescent response. The choice of pH of the
solution for sensing is dictated by the pKa value of the dye.