4.4 Article

Reversible sol-gel transition of a tris-urea gelator that responds to chemical stimuli

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TETRAHEDRON LETTERS
卷 48, 期 51, 页码 8990-8993

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PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2007.10.090

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Tris-urea 1 functioned as a low-molecular-weight gelator for a variety of polar organic solvents. An acetone gel of 1 became a homogeneous solution in response to the addition of anions. The minimum amount of anion necessary for the gel-sol transition was specific to the anion species. A linear relationship was demonstrated between the amount of anion required and the total binding constant of 1 with the anion. Re-gelation occurred by addition of BF3 center dot OEt2 and with ultrasound irradiation of the acetone solution of 1 and F-. (c) 2007 Elsevier Ltd. All rights reserved.

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