Preparation of Alkylamine Intercalated Compounds Derived from Na₂Ti₃O₇

Abstract

Alkylamine (n-CmH_2m+1 NH₂ where m=0∼6) intercalation was quantitatively investigated with layered compounds Na₂Ti₃O₇, and H₂Ti₃O₇. Na₂Ti₃O₇ has exchangeable sodium ions in its interlayer region. These sodium ions were substituted for H⁺ through the HC1 treatment of Na₂Ti₃O₇. The obtained H₂Ti₃O₇ was intercalated by alkylamines. With the original Na₂Ti₃O₇, however, the alkylamine intercalation could not be observed. The intercalation proceeded with the exchange of the interlayer protons for alkylammonium ions, but only a part of them (25∼42%) were exchanged. The orientation of the intercalated alkylammonium ions was estim ated on the basis of interlayer distances increasing with an increase of the carbon number in the alkylammonium ion (Fig.1), and a model with double layers of the alkylammonium ions (Fig.2) was proposed.