Concomitant intercalation and decomplexation of ferrocene sulfonates in layered double hydroxides

In the [Zn-Cr-Cl] lamellar double hydroxide corresponding to the chemical formula [Zn-2(2+)+Cr3+(OH-)(6)][Cl-, 2H(2)O], chlorine anions can be easily exchanged by various moieties, For example, it is possible to replace Cl- ions with ferrocene mono- and disulfonate salts in the interlamellar space, In a second step, these organic molecules can be removed by carbonate ions. XPS, EXAFS, Mossbauer spectroscopy, and magnetic measurements show that during this last exchange ferrocene sulfonates are decomplexed, liberating Fe3+ ions which then would be introduced into the hydroxide layers, The main consequence is a modification of magnetic properties. (C) 1999 Academic Press.