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Structure-Reactivity Relationships in Boronic Acid-Diol Complexation

Structure-Reactivity Relationships in Boronic Acid-Diol Complexation

William L A Brooks, Christopher C Deng, Brent S Sumerlin

ACS Omega. 2018 Dec 19;3(12):17863-17870.

PMID: 31458380

Abstract:

Boronic acids have found widespread use in the field of biomaterials, primarily through their ability to bind with biologically relevant 1,2- and 1,3-diols, including saccharides and peptidoglycans, or with polyols to prepare hydrogels with dynamic covalent or responsive behavior. Despite a wide range of boronic acid architectures that have been previously considered, there is a need for greater understanding of the structure-reactivity relationships that govern binding affinity to diols. In this study, various boronic acids and other organoboron compounds were investigated to determine their pK a and their binding constants with the biologically relevant diols including sorbitol, fructose, and glucose. Boronic acid pK a values were determined through spectroscopic titration, whereas binding constants were determined by fluorescence spectroscopy during competitive binding studies. Key structure-reactivity relationships clearly indicated that both boronic acid structure and solution pH must be carefully considered. By considering a variety of boronic acids with systematically varied electronics and sterics, these results provide guidance during selection of organoboron compounds in sensing, delivery, and materials chemistry.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP1287753427	(6-Methyl-5-quinolinyl)boronic acid		1287753-42-7	Price

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