| Abstract: Intercalation behavior of n-alkylamines into layered W2O6·H2O has been investigated. W2O6·H2O can accommodate n-alkylamines(CnH2n+1NH2,n=4,8,12,16)to form intercalation compounds via an acid-base mechanism, and reversible intercalation and deintercalation behavior was observed among DAn(where DAn represents intercalation compounds of W2O6·H2O/CnH2n+1NH2, and DA4, DA8, DA12, DA16 denote W2O6·H2O/C4H9NH2, W2O6·H2O/C8H17NH2, W2O6·H2O/C12H25NH2, and W2O6·H2O/C16H33NH2, respectively). The intercalation compounds were characterized by XRD, IR, SEM as well as TG-DSC. The results show that the interlayer distance of intercalation compounds increases with the increase in the number of carbon atoms in the n-alkyl chain, and n-alkylamines exhibit a bilayer arrangement in the interlayer space with a tilt angle of 71.6°. The intercalation of n-alkylamines (CnH2n+1NH2, n=4, 8, 12, 16) into W2O6·H2O also appears to increase the band-gap energy (Eg) as compared with W2O6·H2O or WO3, but no difference in Eg was observed among DAn, indicating that the oxide layers are electronically decoupled. |
