Abstract
The reaction between natural phlogopite, having the idealized formula KMg3(AlSi3O10)(OH)2, and phenylphosphonic acid under soft conditions (24 h, 80 °C, reflux) originated a new layered material of the following idealized composition: [Mg(H2O)2]0.5(AlSi3O6)(O3PC6H5)2·2H2O. The reaction mechanism involves the rupture of the trioctahedral layers of phlogopite and the formation of a new basal spacing of a hydrophobic type that is occupied by phenylphosphonic groups in a pseudomonomolecular arrangement. Simultaneously, the mobile K+ ions become partially substituted by [Mg(H2O)2]2+ groups, a hydrophilic space of the vermiculite type thus being obtained.
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