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  • 03월 02일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제109회 대한화학회 학술발표회, 총회 및 기기전시회 안내 The Gelation of Pyridine-Based Ligand Introduced Diacetylene and Its Characterization

2012년 2월 14일 16시 26분 40초
INOR.P-148 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
4월 25일 (수요일) 18:00~21:00
저자 및
최연원, 서무룡, 정종화
경상대학교 화학과, Korea

A pyridine-based ligand introduced diacetylene was synthesized using a few steps and gelated in water by heating. Interestingly, the ligand formed the metallogel in the presence of Zn2+ ions in DMSO. The hydrogel and the metallogel with Zn2+ were characterized by scanning electron microscopy (SEM), UV-vis spectroscopy and fluorophotometry. The hydrogel prepared at low concentration was made of micrometers-long nanofibrils as shown by SEM. On the other hand, the metallogel did not show nanofibrils but lumps. The fluorescence intensity of the gel in the presence of Zn2+ is quenched beside that of hydrogel which has no metal. When UV-vis was measured with pH-change, there wasn’t any particular alteration in absorbance and wavelength, and it showed similar tendency in those of fluorescence measurement. The diacetylene introduced ligand which includes benzene instead of pyridine was prepared for reference test. This ligand changed its color from white to blue under UV irradiation and it suggests that the polymerization was occurred by covalent bond (Fig 1). The color change of diacetylene-introduced ligand depends on the degree of polymerization reaction in the ligand. The blue phase signifies that the degree of polymerization is high. In this case, the color change to blue seems to originate from hydrogen bond between amide group and carbonyl group. Interestingly, the blue phase turned to red phase under high temperature. It means that the diacetylene-introduced ligand can be applied to thermo-sensitivity sensor. The ligand gelated in DMSO with Cu2+ ions.