Sandwich Polyoxoanion Compounds

The title complexes are the first well-characterized multiiron sandwich compounds prepared via rational synthesis from lacunary or defect species. They have possible applications as catalysts for the oxidation of organic compounds with the environmentally friendly oxidant H202 and constitute a well-defined multiiron species to facilitate the further investigation and delineation of magnetic interactions in such systems.  

Ferrous chloride tetrahydrate (FeCl2 4H20, 0.48 g) is dissolved in 25 mL of H2O in a 60-mL beaker, and 3.0 g (1.09 mmol) of A-NagHPW9034 19H20 ° is added 

Department of Chemistry, Emory University, 1515 Pierce Dr. Atlanta, GA 30322. Department of Chemistry, Colorado State University, Fort Collins, CO 80523-1872. 

DODECASODIUM TRIACONTATUNGSTOTETRAIRONTETRA PHOSPHATE HYDRATE Nai2[Fe 4(H20)2(P2Wi50s6)2] 58H2O  

The sodium salt of this Wells-Dawson-derived sandwich polyoxoanion is a yellow crystalline solid that is soluble in water. It is characterized in solution by P NMR (9 mM solution in H2O, D2O in a capillary insert) one resonance for the distal P atoms at —11.1 ppm (Aj/]/2 = 70 Hz). In the solid state the compound always contains NaCl as it must be crystallized from aqueous NaCl solution. If NaBr is substituted for NaCl in the aqueous crystallization process, crystals of the compound still form but now contain NaBr in place of NaCl. This sandwich complex is characterized in the solid state by IR (2% KBr pellet, 1300-400 cm ) 1091(s), 1017(w), 951(s,sh), 917(m), 826(s), 757(s), 695(s), 630(m,sh), 526(w). The crystal data for Nai2[Fe 4(H20)2(P2Wi5056)2] -58H20 

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