Fractal structures in homo- and heteroaggregated water soluble porphyrins
Fractal structures in homo- and heteroaggregated water soluble porphyrins
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DOI：
10.1021/jp001750y
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发表时间：
2000-10-12
影响因子：
3.3
通讯作者：
Scolaro, LM
中科院分区：
文献类型：
--
作者：
Micali, N;Romeo, A;Scolaro, LM
根据实验条件的不同，各种带电的水溶性卟啉可以聚集在一起，从而形成大的超分子组装，其基本构件是由相反电荷的分子组成的J型聚集体或异相聚集物种组成的。用弹性光散射技术研究了阴离子四(4-磺酸基苯基)卟啉(H_2TPPS44-)及其与阳离子四(4-N-甲基吡啶)卟啉(H(2)TMpyP(4)(4+))或其部分金属衍生物在不同实验条件下的自聚集及其杂聚体的介观结构。实验结果表明，大星团的存在可以用分形几何来描述。相应的d(F)值强烈依赖于生长机制，这可以通过改变pH和/或离子强度来调节。
Depending on the experimental conditions, various charged water soluble porphyrins can aggregate, leading to large supramolecular assemblies whose basic building blocks are constituted by J-type aggregates or heteroaggregated species made up by oppositely charged molecules. The mesoscopic structures resulting on (i) the self-aggregation of the anionic porphyrin tetrakis(4-sulfonatophenyl)porphine (H2TPPS44-) and (ii) its heteroaggregates with the cationic tetrakis(4-N-methylpyridinium)porphine (H(2)TMpyP(4)(4+)) or some of its metal derivatives, under various experimental conditions, have been investigated through elastic light-scattering technique. The experimental results suggest the presence of large clusters that can be described in terms of fractal geometry. The corresponding d(f) values depend strongly on the growth mechanisms, which can be modulated by changing pH and/or ionic strength.