Porphyrin-clay complexes, thermal

The thermal characteristics of synthetic organo-clay complexes are of interest for several reasons. First, since clay synthesis takes place at elevated temperatures (100-300 C), the stability of each constituent must be assured. The degree to which the thermal characteristics of a template are affected by a support is also of importance. In addition, the porphyrin-clay complexes are of interest as advanced materials in such areas as electrochemistry and catalysis (7), and as highly organized molecular assemblies (S). Since thermal stability... 

Thermal Analysis. Clays, porphyrins, and porphyrin-clay complexes were analyzed by thermal gravimetric analysis under an inert nitrogen atmosphere. One previous study of the thermal stability of porphyrins reports that weight loss is greater and less complex in oxygen compared to nitrogen 10), Weiss... 

CARRADO ET AL. Thermal Analysis of Porphyrin—Clay Complexes... 

Aluminosilicate smectite clays have been ion-exchanged with water-soluble, cationic porphyrins and metalloporphyrins. Characteristics of their thermal stability were measured by thermal gravimetric analysis in an inert atmosphere, which yielded approximately 60% weight loss of organics. Detailed structural information about the decomposition products was obtained by performing pyrolysis-gas chromatography-mass spectrometry on the clay-organic complexes. 

Spectroscopic and chemical studies of vanadyl OEP have been reported, including m 50-substitution to form nitro-, chloro-, and benzoyloxy-derivatives trans-alkylation occurs when the vanadyl porphyrin is heated on clay and other supports, thus providing a model for the generation of homologous polyalkyl-porphyrins in crude oil and bitumen. m sa-Tetraferrocenyl-porphyrin and its copper complex have been prepared, and spectroscopic and other studies carried out on mixed-valence oxidation products, as models for the study of thermal electron-transfer processes in cytochrome-c. X-Ray crystal structures have been reported for diaquo and perchlorate complexes of Fe" TPP, " dichloro-molybdenum complexes of OEP and TPP, and for the bis-[(R5)-l-phenyl-ethylamine] complex " of Co TPP. Oxomolybdenum complexes TPP-... 

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