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Gelating Abilities of Two-Component System of Catecholic Derivatives and a Boronic Acid

Department of Applied Chemistry, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan
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Received: 19 July 2019 / Revised: 20 August 2019 / Accepted: 18 October 2019 / Published: 22 October 2019
In the last two decades, various kinds of the low-molecular-weight organogelators (LMOGs) have been investigated in terms of technological applications in various fields as well as their fundamental scientific properties. The process of gelation is generally considered to arise from immobilization of the solvents in the three-dimensional networks formed by the assembly of gelator molecules through weak intermolecular noncovalent interactions. From these points of view a huge number of organogelators have been developed so far. In the course of our research on LMOGs we have noticed a mixture of two gelators could show a different trend in gelation compared to the single gelator. It is well known that the catecholic moiety easily forms cyclic boronate esters with the boronic acid. Thus, we have investigated the two-component system based on cyclic boronate esters formed by the catechols and a boronic acid in terms of the control of gelation capability. Basic gelation properties of the constituent catecholic gelators have also been clarified. The catecholic gelators with the amide unit form no gel by addition of the boronic acid. In contrast, the catecholic gelators with the glutamic acid moiety improve their gelation abilities by mixing with the boronic acid. Furthermore, the gelation ability of the catecholic gelators having the urea unit is maintained after addition of the boronic acid. It has been found that gelation abilities of the catecholic gelators are highly affected by addition of the boronic acid. In terms of practical applications some gels can be obtained by on-site mixture of two kinds of solutions. View Full-Text
Keywords: catechol; organogel; boronate ester catechol; organogel; boronate ester
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MDPI and ACS Style

Tsuge, A.; Kamoto, R.; Yakeya, D.; Araki, K. Gelating Abilities of Two-Component System of Catecholic Derivatives and a Boronic Acid. Gels 2019, 5, 45. https://doi.org/10.3390/gels5040045

AMA Style

Tsuge A, Kamoto R, Yakeya D, Araki K. Gelating Abilities of Two-Component System of Catecholic Derivatives and a Boronic Acid. Gels. 2019; 5(4):45. https://doi.org/10.3390/gels5040045

Chicago/Turabian Style

Tsuge, Akihiko, Ryota Kamoto, Daisuke Yakeya, and Koji Araki. 2019. "Gelating Abilities of Two-Component System of Catecholic Derivatives and a Boronic Acid" Gels 5, no. 4: 45. https://doi.org/10.3390/gels5040045

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