The reactivity and thermal properties of two simple water-soluble mesosubstituted porphyrins, TPPS and TMPyP, in the interlayer space of montmorillonite were studied.
Positively charged TMPyP was rapidly adsorbed by montmorillonite, whereas, almost no negatively charged TPPS was adsorbed. The amount of TMPyP adsorbed on Cu-, Co-, Ni-, and H-montmorillonite was much greater than that on Namontmorillonite. Adsorbed TMPyP molecule was mainly metallated in the interlayer space of Cu-montmorillonite but was protonated in Co-, Ni-and H-montmorillonite. When montmorillonite-TMPyP complex was heated in air, adsorbed TMPyP decomposed in two steps. First mesosubstituents decomposed and then the tetrapyrrolic ring was eliminated.
