A Monolayer Complex of Cu₂(OH)₃C₁₂H₂₅SO₄ Directly Precipitated from an Aqueous SDS Solution

A layered complex with the chemical composition of Cu2(OH)3C12H25OSO3 was obtained through direct precipitation from a sodium dodecyl sulfate micellar solution of Cu(II) at a nearly neutral condition (pH approximately equals 6.8). From the XRD, 13C CPMAS NMR, and the spin probe ESR observations, a modified botallackite structure with a monolayer alkyl phase was proposed for the complex. Magnetic susceptibility measurements for the complex showed that there exist at least two exchange couplings: one is positive, and its magnitude is larger than that of the other, which is negative (J approximately equals -8 K). Although the cupric ions of the complex are paramagnetic, most of those are ESR silent and only the ESR signals from defects could be observed even at 298 K. A spin clustering model has been employed to explain the magnetic properties of the complex.