Nous avons prepare une serie de chiroporphyrines comportant des brides entre deux substituants meso adjacents. La modification de la longueur de ces brides permet d'ajuster de facon controlee la distorsion de type fronce de la chiroporphyrine, qui est due a l'alternance α, β, α, β des substituants meso. Des determinations de structure par diffraction des rayons X montrent que les contraintes intermoleculaires au sein du reseau cristallin peuvent stabiliser des conformeres qui different notablement de la conformation moyenne observee en solution par 1 H-RMN. Pour citer cet article<space>: S. Gazeau et al., C. R. Chimie 5 (2002) 27-31
We have synthesized a series of chiroporphyrins in which the ester functions on adjacent meso substituents are linked by a bridle of adjustable length. The ruffled distortion induced by the α, β, α, β alternation of the porphyrin meso substituents can be controlled by the length of the bridles. X-ray structure determinations show that intermolecular constraints within the crystalline network can stabilize conformers that considerably differ from the mean conformation observed in solution by 1 H-NMR. To cite this article: S. Gazeau et al., C. R. Chimie 5 (2002) 27-31