Imino nitrile sensors for selective fluoride detection = 선택적 불소 감지를 위한 이미노 나이트릴 센서의 합성

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Fluoride ions exist in abundance throughout nature, and human exposure to fluoride is inevitable. High levels of fluoride intake (over 2 ppm) induces acute and chronic illnesses such as gastric disorders, dental and skeletal fluorosis, and urolithiasis. To minimize the potentially harmful exposure, fluoride selective detectors must be developed that gives colorimetric response for easy detection. In this thesis, we developed a one-pot synthesis of 4 different sensors that are based on diaminomaleonitrile units tethered on aldehydes. The structures provide bright color change visible even to the naked eye at $F^-$ ion concentrations as low as 2 ppm. Furthermore, when tested along with similar anions such as $CN^-$, $I^-$, $Br^-$, $Cl^-$, $NO_3^-$, $PO_4^{3-}$, $OAc^-$, and $HSO_4^-$, the sensors only displayed visible color change in the presence of fluoride, indicating high selectivity. $HF_2^-$ ion generation is clearly observed in $^{19}F$ NMR, which is a direct evidence for the participation of nitrogens in the donor moiety providing its unique difference in the selectivity. This thesis sets forth an unprecedented selectivity of $F^-$ ions over $CN^-$ ions, previously not achieved by others. Additionally, the detection limit of 2 ppm complies with World Health Organization (WHO) standards.
Advisors
Yavuz, Cafer T.researcher야부즈자패르타야르researcher
Description
한국과학기술원 :생명화학공학과,
Publisher
한국과학기술원
Issue Date
2019
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 생명화학공학과, 2019.2,[vii, 58 p. :]

Keywords

Fluoride▼aSensor▼aSelective detection▼aNaked eye detection▼aWater treatment; 불소 이온▼a센서▼a선별적 감지▼a육안을 통한 불소 이온 감지▼a수처리

URI
http://hdl.handle.net/10203/266334
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=843246&flag=dissertation
Appears in Collection
CBE-Theses_Master(석사논문)
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