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Interaction of various molar ratios of meso-tetraphenylporphyrins with two different trialkylsilyl chlorides in chloroform only afforded l:2 molecular complexes at room temperature. Spectral properties closely corresponded to those of diprotonated mesotetraphenylporphyrin, strongly suggesting similar pseudo tetrahedrally distorted porphyrin core structures with s-bonding from two pyrrolenine nitrogen donors to the silicon centers and two hydrogen bonds between two pyrrole NHÁ Á Á and Á Á ÁClSi groups from above and below the mean plane of the porphyrins with nearly trigonal bipyramidal coordination geometries for silicon centers, with alkyl groups located at the equatorial sites.

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A Fe–porphyrin catalyst was anchored covalently onto functionalized multi-walled carbon nanotubes.