The mechanisms of boronate ester formation and fluorescent turn-on in ortho-aminomethylphenylboronic acids.

The mechanisms of boronate ester formation and fluorescent turn-on in ortho-aminomethylphenylboronic acids.
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DOI:
10.1038/s41557-019-0314-x
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发表时间:
2019-09
期刊:
影响因子:
21.8
通讯作者:
Anslyn EV
Anslyn EV
中科院分区:
化学1区
文献类型:
--
作者:
Sun X;Chapin BM;Metola P;Collins B;Wang B;James TD;Anslyn EV

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ortho-Aminomethylphenylboronic acids are used in receptors for carbohydrates and various other compounds containing vicinal diols. The presence of the o-aminomethyl group enhances the affinity towards diols at neutral pH, and the manner in which this group plays this role has been a topic of debate. Further, the aminomethyl group is believed to be involved in the turn-on of the emission properties of appended fluorophores upon diol binding. In this treatise, a uniform picture emerges for the role of this group: it primarily acts as an electron-withdrawing group that lowers the pKa of the neighbouring boronic acid thereby facilitating diol binding at neutral pH. The amine appears to play no role in the modulation of the fluorescence of appended fluorophores in the protic-solvent-inserted form of the boronic acid/boronate ester. Instead, fluorescence turn-on can be consistently tied to vibrational-coupled excited-state relaxation (a loose-bolt effect). Overall, this Review unifies and discusses the existing data as of 2019 whilst also highlighting why o-aminomethyl groups are so widely used, and the role they play in carbohydrate sensing using phenylboronic acids.
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