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Comptes Rendus Chimie
Volume 8, n° 8
pages 1276-1281 (août 2005)
Doi : 10.1016/j.crci.2005.02.018
Received : 26 July 2004 ;  accepted : 27 January 2005
Morphology control of organic luminescent microcrystals and approach of their optical properties

Mouhammad Abyan, Liliana Bîrlǎ, Franck Bertorelle, Suzanne Fery-Forgues
Laboratoire des interactions moléculaires et réactivité chimique et photochimique, UMR CNRS 5623, université Paul-Sabatier, 118, route de Narbonne, 31062 Toulouse cedex, France 

*Corresponding author.

Microcrystals of an organic fluorescent dye, 4-octylamino-7-nitrobenz-2-oxa-1,3-diazole, were prepared using a reprecipitation method, based on solvent-exchange. We show here that their shape and size can be nicely tuned by the presence of various macromolecules in the reprecipitation medium. To do so, poly(acrylic acid) and calf thymus DNA were used as additives. Homogeneous populations of microcrystals were thus obtained in a reproducible way. Their size and morphology varied with the additive used. The UV/vis absorption and luminescence properties of these microcrystals in suspension are briefly reported. To cite this article: M. Abyan et al., C. R. Chimie 8 (2005) .

The full text of this article is available in PDF format.

Des microcristaux d'un colorant organique fluorescent, le 4-octylamino-7-nitrobenz-2-oxa-1,3-diazole, ont été préparés en utilisant la méthode de reprécipitation, qui est basée sur un échange de solvant. Nous montrons ici que leur forme et leur taille peut être modulée par la présence de différentes macromolécules dans le milieu de reprécipitation. Pour cela, l'acide poly(acrylique) et l'ADN de thymus de veau ont été utilisés comme additifs. Des populations homogènes de microcristaux ont été obtenues de manière répétable. Leur taille et leur morphologie diffèrent selon l'additif utilisé. Les propriétés d'absorption et de luminescence de ces microcristaux ont été brièvement analysées. Pour citer cet article : M. Abyan et al., C. R. Chimie 8 (2005) .

The full text of this article is available in PDF format.

Keywords : Organic microcrystals, Reprecipitation, Poly(acrylic acid), DNA

Mots clés : Microcristaux organiques, Reprécipitation, Acide poly(acrylique), ADN

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