Designed Reversible Alkylamine Intercalation–Deintercalation in the Layered Perovskite‐Type Oxide KCa₂Nb₃O₁₀

Abstract

Reactions have been designed to verify the reversibility of butylamine intercalation–deintercalation in the layered perovskite‐type oxide KCa2Nb3O10. The reactions include ion exchange to form HCa2Nb3O10·1.5H2O, butylamine intercalation for producing C4H9NH3Ca2Nb3O10, transformation of C4H9NH3Ca2Nb3O10 into HCONH3Ca2Nb3O10 by formamide substitution and conversion of HCONH3Ca2Nb3O10 into HCa2Nb3O10·1.5H2O again by ion exchange. The complete reaction cycles were monitored by XRD, Raman spectroscopy, thermogravimetric (TG) and elemental analysis, and the resulting information was used to propose the structure evolution and to determine the organic components of the products. The well‐matched powder X‐ray diffraction (XRD) patterns and Raman spectra between the initial and recovered protonated materials confirmed that they have identical structural features of a protonated triple‐layered perovskite. The C, H and N elemental analysis results and TG data indicate that the regenerated layered perovskite‐type oxides also have a high capacity for alkylamine intercalation. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)

Revisiting Tungsten Trioxide Hydrates (TTHs) Synthesis - Is There Anything New?

“…About 2 g of the TTH product was treated with 40 mL of an n -octylamine (C8A) and hexane mixture. Very interestingly, we see both layered TTHs changed to a white color within a few minutes, and PXRD shows the evidence of an intercalation reaction, which is found to be consistent with the intercalation chemistry of TTHs and layered perovskite-related structures. ,,,− …”

Preparation of niobium based oxynitride nanosheets by exfoliation of Ruddlesden-Popper phase precursor

“…6 indicates that while the KCN was thermally stable in the measured temperature range, the oxynitrides suffer weight loss, compatible with the literature [7,25]. At lower temperatures (up to 100 °C) evaporation of surface adsorbed or some Several authors have already worked with the protonation and exfoliation of RP phase oxides [11,24,28,29].…”

Efficient Microwave-Assisted Functionalization of the Aurivillius-Phase Bi2SrTa2O9

“…Functionalization of these materials by intercalation of organic compounds has been widely described in the literature, following the pioneering work on the functionalization of layered niobiates, titanates, and titano-nobiates , by acid–base reactions with amines. Such functionalization process involves first the transformation of the layered perovkites into their protonated forms. − For Aurivillius phases, this initial transformation involves the selective leaching of the bismuth oxide layers. ,− Then the protonated layered perovskites can be functionalized by amines, via cation exchange or acid–base reaction, − or, for Ruddlesden–Popper and Dion-Jacobson phases, by alcohols, − sugars, or phosphonic acids, via grafting reactions.…”