Stability of Cu(II)− and Fe(III)−Porphyrins on Montmorillonite Clay: An X-ray Absorption Study

摘要: The Cu(II) and Fe(III) complexes of water-soluble tetrakis(N,N,N-trimethylanilinium)porphyrin (TTAP) tetrakis(N-methylpyridyl)porphyrin (TMPyP) were placed within the interlayers Ca(II)−montmorillonite through ion exchange. free base forms porphyrins also added to samples Cu(II)− Fe(III)−montmorillonites. X-ray absorption spectroscopy (XAS), both near-edge structure (XANES) extended fine (EXAFS), used monitor fate metal ions. Cu(II)−metalloporphyrins do not demetalate upon contact with acidic montmorillonite support. XAS data suggest that Fe(III)−porphyrin are stable on smectite supports. XANES demonstrate porphyrin TTAP metalates surface a Cu(II)-exchanged clay form Cu(II)−porphyrin-clay complex.