Porphyrin aggregation in aqueous solutions: Small angle and quasielastic light scattering results

被引：16

作者：

Mallamace, F

Micali, N

Scolaro, LM

Pasternack, RF

Romeo, A

Terracina, A

Trusso, S

机构：

[1] CNR, IST TECN SPETTROSCOPICHE, I-98166 MESSINA, ITALY

[2] UNIV MESSINA, DIPARTIMENTO CHIM INORGAN ANALIT & STRUTTURA MOL, MESSINA, ITALY

[3] CNR, ICTPN, MESSINA, ITALY

[4] SWARTHMORE COLL, DEPT CHEM, SWARTHMORE, PA 19081 USA

来源：

JOURNAL OF MOLECULAR STRUCTURE | 1996年 / 383卷 / 1-3期

关键词：

small angle light scattering; quasi elastic light scattering; porphyrin;

D O I：

10.1016/S0022-2860(96)09295-2

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The porphyrin trans-bis(N-methylpyridinium-4-yl)diphenylporphyine (t-H2Pagg) is known to form in solution large assemblies and supramolecular structures in the presence of polyanions, such as nucleic acids, as a template support. We have studied the aggregation of the unbound porphyrin in 0.1 M NaCl aqueous solutions. The aggregation process was monitored by a time resolved small angle light scattering apparatus. The intensity profile of the scattered light as a function of the exchanged wavevector q, conforms to a scattered law for fractal aggregates in the range 0.2-31.4 mu m(-1). An analysis of the intensity data reveals a value of the fractal dimension dr equal to 2.5. Additional dynamic light scattering measurements confirm the presence of almost monodispersed aggregates in the mesoscopic range.

引用

页码：255 / 260

页数：6

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