Ferrocene, or ferrocyclopentadienyl iron, is an organometallic compound with the formula Fe(C5H5)2 that sublimates slightly at room temperature and thus has a distinctive camphor-like odor. Ferrocene is the most important complex and the first sandwich complex to be discovered, consisting of two anions bonded to iron atoms by PI electrons.

Mannitol is colorless crystalline powder, odor free and with sweet taste, it is easily dissolved in water and slightly dissolved in ethyl alcohol. Mannitol is a type of functional sugar alcohl with excellent performance.Mannitol 's molecular formula is C6H14O6 and molecular weight is 182.17.Mannitol is nonhygroscopic, odorless, white or colorless crystal powder.