Mr. Weir et Ra. Kydd, SYNTHESIS OF HETEROPOLYOXOMETALATE-PILLARED MG AL, MG/GA, AND ZN/AL LAYERED DOUBLE HYDROXIDES VIA LDH-HYDROXIDE PRECURSORS/, Inorganic chemistry, 37(21), 1998, pp. 5619-5624
We report the synthesis of acidic (Zn/Al-POM) and basic (Mg/Al-POM and
Mg/Ga-POM) materials by a general route previously demonstrated only
for basic LDH materials. In each case, H2W12O406- or PW11O397- pillare
d materials with significant BET surface areas were obtained. Stringen
t control over the M2+:M3+ ratio in the layers of the POM-pillared pro
ducts was not possible, and loss of M2+ was found to be the most sever
e for the Mg/Ga and Zn/Al materials. Infrared analysis indicated that
complete exchange of adipate anions in the precursor material by POM a
nions was achieved except for the Zn/Al analogues. Removal of the resi
dual adipate anions after washing the product with a dilute base solut
ion was possible, but a concomitant decrease in surface area could not
be avoided.