Abstract
The reaction of meso-tetraarylporphyrins (H 2T(X)PP) with SnCl 4 affords green intermediate sitting-atop (i-SAT) complexes, [(H 2T(X)PP)SnCl 4]. UV–Vis, 1H NMR and 13C 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 SnCl 4. 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.
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