120th General Meeting of the KCS

Type Poster Presentation
Area Inorganic Chemistry
Room No. Exhibition Hall 2+3
Time 10월 19일 (목요일) 11:00~12:30
Code INOR.P-5
Subject Ratiometric emission change by deboronation of 1,3,5-tris-(o-carboranyl-methyl)benzene
Authors Dong Kyun You, Myung Hwan Park1,*, Kang Mun Lee*
Department of Chemistry, Kangwon National University, Korea
1Department of Chemical Education, Chungbuk Natioanl University, Korea
Abstract The detection of fluoride anions, contributes in the protection of the environment. Although fluoride is necessary in dental health-care and in the prevention and treatment of osteoporosis at optimum concentrations, it is considered a biohazard at high concentrations. In this regard, receptors or reactants that can bind with fluoride anions have been actively studied for their potential in the development of chemosensors. 1,3,5-Tris-(o-carboranyl-methyl)benzene (closo-1) and its nido-form (nido-1) were synthesized and completely characterized. The solid-state molecular structure of closo-1 was determined by single-crystal X-ray diffraction analysis. Compound closo-1 showed an great single emission in various organic solvents that was bathochromic shifted with increasing solvent polarity. The positive solvatochromic effect and theoretical calculation results at the first excited (S1) optimized structure of closo-1 strongly propose that this emissive band can be assigned to an intramolecular charge transfer. Meanwhile, nido-1 showed a noticeable bathochromic shift of the emissive band compared to that of closo-1 and aroused low-energy emission. The specific emissive aspects of nido-1 were attributed to the elevation of its HOMO level, estimated by cyclic voltammetry. The photophysical changes by conversion from closo-1 to nido-1 allowed the emissive color-tunable sensing of fluoride. Thus, the tris-o-carboranyl compound exhibited great potential as a chemodosimeter for fluoride anion sensing, detectable by the naked-eye.
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