Dendrimer-tuned formation of luminescent organic microcrystals

被引:68
作者
Bertorelle, F [1 ]
Lavabre, D [1 ]
Fery-Forgues, S [1 ]
机构
[1] Univ Toulouse 3, UMR CNRS 5623, Lab Interact Mol Reactivite Chim & Photochim, F-31062 Toulouse, France
关键词
D O I
10.1021/ja029822h
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Microcrystals of an organic fluorescent dye, 4-n-octylamino-7-nitrobenz-2-oxa-1,3-diazole (NBD-C8), were prepared by reprecipitation in water. The crystallization kinetics was monitored by UV/vis absorption spectroscopy, and a model was proposed. The size and shape of the microcrystals were analyzed by laser light scattering, fluorescence microscopy, and scanning electron microscopy. In the presence of PAMAM dendrimers of generation 2.5, 3.5, and 4.5, the crystallization process was drastically accelerated. The crystals obtained were smaller and more regular than those formed in pure water and were not agglomerated. There are probably two levels of interaction of NBD-C8 with the dendrimers, which act as both templates and colloid stabilizers.
引用
收藏
页码:6244 / 6253
页数:10
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