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

제109회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Preparation and photochromic reaction of Spiropyran-PAMAM dendon

2012년 2월 17일 16시 11분 02초
ORGN.P-923 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
4월 25일 (수요일) 18:00~21:00
저자 및
신은주, 허대영1
순천대학교 화학과, Korea
1순천대학교 기초의화학부, Korea
Since dendimers are first envisaged by Flory in 1941 and first synthsized by Newkome and Tomalia, they have attracted much attention because of their fascinating structure and unique properties. Dendrimers show the most appealing characteristics such as size monodisperse, globular macrocyclic architecture, ample interior voids, and peripheral fuctional density, pH-dependent contraction and swelling, amphiphilicity, thermal stability, flexibility, low viscosity, high biocompatability. Consequently, dendrimers have inspired active research activities in material science, sensors, nanoreactors, green catalyst supports, biomaterials, and drug delivery systems. Spiropyran(SP), nonpolar UV-absorbing form, is well-known photochromic compound accomplishing reversible molecular structural changes to merocyanine(MC), polar VIS-absorbing form, by the photochemical ring opening on UV irradiation. In turn, MC is reversed to SP by ring closure thermally or on irradiation of visible light. Reversible photochromic SP-MC transformation is one of subjects of active research on optical memory and switch, on the basis of significant difference in polarity, excited state energy, or molecular geometry between two forms. Incorporating photochromic molecules into PAMAM dendron leads to a variety of photoresponsive systems, the properties of which can be manipulated by light. In this study, porphyrin-PAMAM dendron was prepared and their reversible photochromic reaction was investigated using absorption spectroscopy.