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Isothiouronium-based amphiphilic gold nanoparticles with a colorimetric response to hydrophobic anions in water: a new strategy for fluoride ion detection in the presence of a phenylboronic acid |
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| Authors: | Tsuyoshi Minami Takeshi Nagasaki |
| Affiliation: | a Department of Applied Chemistry, Graduate School of Science and Technology, Saitama University, 255 Shimo-ohkubo, Sakura-ku, Saitama 338-8570, Japan b Department of Material Science and Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan c Department of Applied Chemistry and Bioengineering, Graduate School of Engineering, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan |
| Abstract: | Gold nanoparticles modified with isothiouronium-derived amphiphile units 1 were prepared by the reduction of  with NaBH4 in the presence of bis(5-(N-(2-(2-methoxyethoxy)ethyl)-N-methyl-S-isothiouronio)pentyl) disulfide 2. The obtained nanoparticles 1 showed a selective coloration for hydrophobic anions in water, possibly due to an anion exchange and subsequent aggregation. On the basis of this observation, the detection of F− in water has been achieved using 3-nitrophenylboronic acid as a mediator at pH 5.5, thereby providing a new strategy for the design of a F− sensory system. |
| Keywords: | Isothiouronium unit Gold nanoparticle Colorimetric response Hydrophobic anion Fluoride ion |
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