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1-4-diazabicyclo[2,2,2]octane dihydrochloride (DABCO-2HC1) was reacted with two vermiculite samples to produce intercalates which, at room temperature, had relatively sharp, single crystal X-ray diffraction patterns. At higher temperatures (250"C) the stacking order decreased, and consequently the Ok/reflections with k § 3n became increasingly diffuse. The stacking order of previously heated samples returned when they were cooled. A superstructure was present in which DABCO cations occupied thedoi:10.1346/ccmn.1989.0370110 fatcat:acioq63pibhwpd6jimo5kmltvm