Formation of Submicron Scale Particles of Narrow Size Distribution from a Water-Soluble Dendrimer with Links to Porphyrins and a Fullerene
Formation of Submicron Scale Particles of Narrow Size Distribution from a Water-Soluble Dendrimer with Links to Porphyrins and a Fullerene
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DOI：
10.1021/ma0522817
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发表时间：
2006-01
期刊：
影响因子：
5.5
通讯作者：
T. Arai;Junya Ogawa;E. Mouri;Mohammed P. I. Bhuiyan;N. Nishino
中科院分区：
文献类型：
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作者：
T. Arai;Junya Ogawa;E. Mouri;Mohammed P. I. Bhuiyan;N. Nishino
合成了一种连接卟啉和富勒烯的水溶性L-赖氨酸树枝状大分子（6），其中树枝状大分子表面用羧酸酯基团修饰。6的水溶液在紫外-维斯光谱中显示出聚集卟啉的Soret带特征;然而，通过加入2-羟丙基-β-环糊精（10重量%的水溶液），该聚集体被解离。TEM和AFM显示形成了6. TEM显示在环糊精存在下6的球形颗粒具有几乎均匀的尺寸（100 - 110 nm）。AFM显示在不存在环糊精的情况下6的椭圆形颗粒。DLS测量表明，在水溶液中，环糊精解离了6的聚集结构。因此，大量的卟啉和富勒烯成功地积累了一个狭窄的尺寸分布通过粒子形成的两亲性树枝状大分子。
A water-soluble l-lysine dendrimer (6) with links to porphyrins and a fullerene was synthesized, in which the dendrimer surface was modified with carboxylate groups. The aqueous solution of 6 showed the Soret band characteristic of the aggregated porphyrins in the UV−vis spectra; however, this aggregate was dissociated by the addition of 2-hydroxypropyl-β-cyclodextrin (10 wt % in H2O). TEM and AFM showed the formation of submicron-scale particles of 6. TEM showed the spherical particles of 6 with almost uniform size (100−110 nm) in the presence of the cyclodextrin. AFM showed the oval particles of 6 in the absence of the cyclodextrin. DLS measurement indicated that cyclodextrin dissociated the aggregated structure of 6 in H2O. Thus, a large number of porphyrins and fullerenes were successfully accumulated with a narrow size distribution via the particle formation of the amphiphilic dendrimer.