INTERCALATION OF PRIMARY DIAMINES IN THE LAYERED PEROVSKITE OXIDES, HSR2NB3O10

The layered perovskite oxide, KSr2Nb3O10, was synthesized. The interla yer potassium cations were readily exchanged by protons in hydrochlori c acid solution to give the protonation compound, HSr2Nb3O10. 0.5H(2)O . The intercalation compounds, [NH3(CH2)(n)NH3]Sr2Nb3O10, were also ob tained by acid-base reactions between the protonation compound and org anic bases, 1,n-alkyldiamines. The interlayer distances in the interca lation compounds were linearly increased with the increase of the numb er of carbon (Delta c/Delta n = 1.05 Angstrom) in 1,n-alkyidiamines. T he intercalated alkyldiammonium ions formed a paraffin-like monolayer with average tilting angle (theta) of ca. 56 degrees. The intercalatio n reactions occurred stoichiometrically. The thermal decomposition pro cess of the intercalation compounds showed distinct three steps due to the desorption of hydrated water, the decomposition of organic moiety , and the decomposition of Sr-related compounds.