PREPARATION AND CHARACTERIZATION OF THE INTERCALATION COMPOUNDS OF α-HAFNIUM PHOSPHATE WITH METHYLPIPERIDINES

ABSTRACT

The mechanism of intercalation reactions between 4-methylpiperidine and n-methylpiperidine with α-HfP in aqueous media has been studied. The intercalated solids obtained are characterized by chemical and thermal analysis, X-ray diffractions and IR spectroscopy. Titration and intercalation isotherms, hydrolysis curves, corrected isotherms, and phase distributions are obtained. Two new phases with the composition α-Hf(HPO₄)·amine·H₂O are isolated and characterized. The influence of basicity and steric factors on the intercalation behaviour is discussed. The arrangement of the two isomeric forms of methylpiperidine in the interlayer space is postulated.