Effects of axial ligands on the intercalation of tetraphenylporphyrinatoantimony(V) into smectite clay layers

Adsorption and intercalation of +1-charged cationic dihydroxo(tetraphenylporphyrinato)-antimony(V) bromide (1a) into an artificially synthesized smectite clay was investigated. The red shift of the Soret band of 1a was observed in an aqueous clay colloidal solution owing to the adsorption onto the clay. Analyses of the X-ray diffraction of the complex obtained between 1a and the clay indicate the intercalation of 1a into the clay interlayer. The hydroxo group as an axial ligand led to the effective intercalation of 1a into the clay.