An investigation of solids formed by surface chemical reaction of OH-silica groups with iron diacetylacetonato chloride (C ₅ H ₇ O ₂ ) ₂ FeCl was presented. The investigation was done using Mössbauer and magneto-chemical studies. The formation of iron-organic groups on SiO ₂ surface was reported from the reaction of iron (III) acetylacetonate with silica surface OH groups.