Synthesis and characterization of intermediate sitting-atop (i-SAT) complexes of free base meso-tetraarylporphyrins and tin(IV) chloride

摘要

The reaction of meso-tetraarylporphyrins (H2T(X)PP) with SnCl4 affords green intermediate sitting-atop (i-SAT) complexes, [(H2T(X)PP)SnCl4], UV-ViS, H-1 NMIR and C-13 NMR spectral data show that the porphyrin core of the complexes is distorted, thus two nitrogen atoms of the pyrrolenine groups on one side of the porphyrin plane act as electron donors to the tin center of SnCl4. The intermediate sitting-atop (i-SAT) complex is formed each time during the incorporation of the metal center, where in the intermediate state the pyrrolic protons still remain on the porphyrin. (C) 2008 Elsevier Ltd. All rights reserved.