The lamellar compound titanium phenylarsonate was synthesized and intercalated with alkylmonoamines (methyl to heptyl), diaminoethane, diaminobutane, lutidine and alpha-picoline. The host was characterized through elemental analysis, X-ray diffraction, surface analysis, porosity, infrared spectroscopy, thermogravimetry and electronic scanning microscopy. The intercalated compounds did not show significant increases in the interlamellar distances through X-ray diffractometry. The intercalation was confirmed by the thermogravimetric technique, indicating mass losses that correspond to the amines. The ideal intercalation was established by adding increments of 30.0x10-6 dm³ of 0.50 mol dm-3 of each amine into a suspension of about 10x10-3 g of matrix. The number of moles intercalated with alkylmonoamines followed an aleatory order in relation to the increase of the aliphatic chain and the enthalpic values gave -9.18 ± 0.07; -12.10 ± 0.20; -7.61 ± 0.02; -6.88 ± 0.01; -9.47 ± 0.03; -12.84 ± 0.10 and -14.78 ± 0.10 kJ mol-1 for the sequence of alkylmonoamines and varied from -3.66 ± 0.30 to -10.92 ± 1.50 kJ mol-1 for the alkyldiamines. The aromatic amines presented small thermal effects and the unfavorable intercalation is attributed to the large volume of the phenyl group inside the lamella, which hinders insertion of these bases inside the lamellar cavity.
lamellar compound; intercalation; calorimetry; alkylmonoamines; alkyldiamines; aromatic amines
