Solid-state Intercalation of Naphthalene and Anthracene into Alkylammonium-montmorillonites

Intercalation of naphthalene and anthracene into alkyltrimethylammonium (C, H2. + ~ (CH3)3N+; n = 8, 12, 14, 16, and 18)-montmorillonites was carried out by novel solid-solid reactions at room temperature. Octyltrimethylammoniurn(C8)-montmorillonite did not form an intercalation compound with either naphthalene or anthracene. Naphthalene was intercalated into both dodecyltrimethylammonium(C12)and octadecyltrimethylammonium(C18)-montmorillonites to give intercalation compounds. On the other hand, the solid-solid reaction between dodecyltrimethylammonium(C 12)or tetradecyltrimethylammonium(C 14)-montmorillonite and anthracene gave only partly intercalated compounds while hexadecyltrimethylammonium(C16)and octadecyltrimethylammonium(C18)-montmorillonites gave single phase intercalation compounds. The hydrophobic interactions between alkytammoniummontmorillonites and the aromatic compounds are thought to be the driving force for the solid-state intercalation. The extent of the increase in the basal spacing may also be involved in the different reactivity. Key Words--Alkylammonium-montmorillonites, Anthracene, Intercalation, Naphthalene, Solid-state intercalation.