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제109회 대한화학회 학술발표회, 총회 및 기기전시회 안내 A Tetrazole-Based Metallogel Induced with Ag+ Ion and Its Silver Nanoparticle in Catalysis

등록일
2012년 2월 14일 16시 26분 27초
접수번호
0293
발표코드
INOR.P-146 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
4월 25일 (수요일) 18:00~21:00
발표형식
포스터
발표분야
무기화학
저자 및
공동저자
이지하, 이진용1, 정종화
경상대학교 화학과, Korea
1성균관대학교 화학과, Korea
A tetrazole-based ligand forms a supramolecular metallogel in the presence of Ag+ in aqueous solution at basic condition. The silver-induced metallogel has been characterized by SEM, TEM, XRD, and rheometry. The metallogel exhibits a fiber structure. Upon standing, silver nanoparticles grow in the gel. TEM confirmed that the particles are exclusively formed in the gel fibers. The size of the silver nanoparticles formed onto the gel fibers are dependent to the concentration of silver during gel formation. The silver nanoparticles show a face-centered cubic crystalline structure. The silver nanoparticles can effectively catalyze reduction of 4-nitrophenol by sodium borohydride in aqueous solution. The formation of Ag+-induced metallogel does not strongly depend on anions. According to DFT calculations, the two silver cations are coordinated to nitrogen at the tetrazole moiety. The other silver cation is coordinated to the nitrogen of the pyridine and coordinated to the oxygen of the amide moiety. Furthermore, the rheological properties of the Ag+-tetrazole-based metallogel were strongly dependent on the concentration of AgClO4.

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