An air-stable iron cluster alkoxide complex Na-2[Fe-6(OCH2CH2OCH3)(18)(mu(6
)-O)] was prepared from the reaction of iron(III) chloride and sodium 2-met
hoxyethoxide. The complex was used to prepare Sr2FeMoO6, which spin-coated
film:shows a very high positive magnetoresistance of 25% with a magnetic fi
eld of 0.8 T at 300 K.