It has been previously shown that passing Mn2(CO)10 vapour over MCM-41 mesoporous silica at 50°C followed by heat treatment in air resulted in a material with high catalytic activity for propene oxidation. EXAFS studies of the Mn2(CO)10 precursor, MCM-41 treated with Mn2(CO)10 before and after the calcination in air have therefore been carried out and the results are presented in this paper. Upon immobilisation of the Mn2(CO)10, the EXAFS data indicate four Mn-(CO) groups with a Mn-Mn interac...