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제116회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Fibrous Supramolecular Polymer Formed from Artificial Light-Harvesting Multiporphyrin Dendrimer and Multipyridyl Porphyrin

2015년 9월 3일 11시 23분 12초
ORGN.P-409 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 15일 (목요일) 11:00~12:30
저자 및
이호수위, 김주호, 장우동*
연세대학교 화학과, Korea

We report the formation of supramolecular coordination polymers formed from multiporphyrin dendrimers PZnPM (M=H2, Cu) composed of the focal freebase porphyrin or cupper porphyrin with eight zinc porphyrin wings, and multipyridyl porphyrins PyPM (M=H2, Cu) with eight pyridyl groups, through multiple axial coordination interactions of pyridyl groups to zinc porphyrins. UV/Vis absorption spectra were recorded upon titration of PyPFB to PZnPFB. Differential spectra, obtained by subtracting the absorption of PZnPFB without guest addition as well as the absorption of PZnPFB, exhibited clear isosbestic points with saturation binding at 1 equivalent addition of PyPFB to PZnPFB. Job’s plot analysis also indicated 1:1 stoichiometry for the saturation binding. The apparent association constant between PZnPFB, and PyPFB, estimated by isothermal titration calorimetry (ITC), was high enough for fibrous assemblies to form at micromolar concentrations. The formation of a fibrous assembly from PZnPFB, and PyPFB was visualized by atomic force microscopy (AFM) and transmission electron microscopy (TEM). When a 1:1 mixture solution of PZnPFB, and PyPFB in toluene was cast onto mica, fibrous assemblies with regular height (ca. 2 nm) were observed. TEM images obtained from 1:1 mixture solution of PZnPFB and PyPFB in toluene clearly showed the formation of nanofibers with a regular diameter of ca. 6 nm. Fluorescence emission measurement of PZnPM, indicated efficient intramolecular energy transfer from PZn to the focal PFB or PCu.