Intercalation behavior of n-alkylamines into an A-site defective layered perovskite H{sub 2}W{sub 2}O{sub 7}

Journal Article · Thu Mar 15 04:00:00 EDT 2007 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2007.01.009· OSTI ID:21015755

Bingshan, Wang ^[1]; Xiaowen, Dong ^[1]; Zhixuan, Cheng ^[1]; Yanze, Yang ^[1]

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1. Department of Chemistry, Shanghai University, 99 Shang Da Road, Shanghai 200444 (China)

Intercalation behavior of n-alkylamines into a protonated form of an A-site defective layered perovskite H{sub 2}W{sub 2}O{sub 7} has been investigated. Results from XRD indicate these materials are layered with the corresponding interlayer spacing governed by the n-alkylamine chain length, and a reversible intercalation and deintercalation property is observed among these intercalation compounds. The IR spectra of the intercalation compounds with n-alkylamines clearly show that n-alkyl chains possess an all-trans conformation, and H{sub 2}W{sub 2}O{sub 7} accommodate n-alkylamines (C {sub n} H{sub 2} {sub n} {sub +1}NH{sub 2}: n=3, 4, 7, 8, 12, 16) to form intercalation compounds via an acid-base mechanism. A linear relationship between the interlayer distance and the number of carbon atoms in n-alkyl chains is observed to show a bilayer arrangement of the n-alkyl chains with a tilt angle of {approx}71.6{sup o}. Elemental analysis studies reveal that the amounts of intercalated n-alkylamines are about 2.0 mol per [W{sub 2}O{sub 7}]. Despite the surface geometry of H{sub 2}W{sub 2}O{sub 7} is almost identical to those of layered perovskites H{sub 2}[A{sub n} {sub -1} B{sub n} O{sub 3} {sub n} {sub +1}], the amounts of intercalated n-alkylamines of them are different. A reasonable explanation is given through our research. - Graphical abstract: H{sub 2}W{sub 2}O{sub 7} can accommodate n-alkylamines (C {sub n} H{sub 2} {sub n} {sub +1}NH{sub 2}: n=3, 4, 7, 8, 12, 16) to form intercalation compounds via an acid-base mechanism. After intercalation, the [001] reflections of H{sub 2}W{sub 2}O{sub 7} shift to lower angles. The basal space of the intercalation products with n-alkylamines increases with an increase of the number of carbon atoms in n-alkyl chain. The relationship between the interlayer distance, d and the number of carbon atoms in the n-alkyl chain, n, is demonstrated in figure. A linear relationship is clearly observed, as expressed with d=0.241n+0.67.

• OSTI ID: 21015755
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 3 Vol. 180; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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TUNGSTEN COMPOUNDS
X-RAY DIFFRACTION