Synthesis and Characterization of Intercalated Layered Double Metal Hydroxides With Interlayer Aromatic Molecular Anions: Intercalation of 9,10-Anthraquinonedisulfonates Between Layers of Mg and Al Layered Double Hydroxides(MgAl-LDH)

Abstract

9,10-Anthraquinonedisulfonates (AQij; ij=15, 18, 26 and 27) are intercalated between layers of synthetic hydrotalcite. Two or three values of enhanced interlayer distance are observed in powder X-ray diffraction (XRD) patterns of separate solid samples when AQ26 or AQ27 is intercalated, respectively. Dimensions are compared between the distance and the guest molecular size which is estimated in a semiempirical MO calculation. This multiplicity is elucidated as a result of distinct molecular orientations of the interlayer AQij dianion which bridges between adjacent layers of Mg/Al-LDH. The solid state chemistry of the AQij-intercalated products is described on the basis of elemental analysis, diffuse reflection (DR) spectroscopy and X-ray photoelectron spectroscopy (XPS).