N‐n‐Alkylpyridinium Derivatives of Mica‐Type Layer Silicates

Lagaly, G.; Stange, Helena; Taramasso, M.; Weiss, A.

doi:10.1002/ijch.197000046

Cited by 18 publications

(7 citation statements)

References 20 publications

(8 reference statements)

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“…To further prove that the structures are isomorphous, we performed the following simple calculation: Information about the orientation of the surfactant alkyl chains with respect to the lamellar surface can be obtained from the dependence of the d spacing on the number of methylene groups in the side chain. [64][65][66][67] In the case of the EPW/ C n DA complexes the d spacing shows good linearity with tail length, indicating similar packing modes in the EPW/C n DA complexes irrespective of alkyl chain length. The linear relationship between d n and n is written as d n ¼ 0.142n þ 1.27 (nanometers).…”

Section: Characterization Of the Structurementioning

confidence: 83%

Organized Nanostructured Complexes of Polyoxometalates and Surfactants that Exhibit Photoluminescence and Electrochromism

Zhang

Liu

Kurth

et al. 2009

Adv Funct Materials

144

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A variety of functional nanostructured organic/inorganic hybrid materials from the europium‐exchanged derivative of a Preyssler‐type polyoxometalate (POM), [EuP5W30O110]12−, and functional organic surfactants were prepared by the ionic self‐assembly (ISA) route. The effect of organic surfactants on the structure, photoluminescent, electrochemical and electrochromic properties of the POM anions was investigated in detail. All obtained hybrid materials are amphotropic, i.e., exhibit both thermotropic and lyotropic liquid‐crystalline phase behaviour. Investigations of their photophysical properties have shown that the interactions of the various surfactants with the polyanions influence the coordination environments and site symmetry of Eu3+ in different ways. The functional groups in the organic surfactants significantly influence the electrochromic properties and photoluminescence of POMs. Different from normal and pyridine‐containing complexes, no photoluminescence and no electrochromism were observed from the ferrocene‐containing complexes. This may be explained in view of charge transfer between the POM anion and the ferrocenyl group.

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Section: Characterization Of the Structurementioning

confidence: 83%

Organized Nanostructured Complexes of Polyoxometalates and Surfactants that Exhibit Photoluminescence and Electrochromism

Zhang

Liu

Kurth

et al. 2009

Adv Funct Materials

144

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“…Information about the orientation of the surfactant alkyl chains with respect to the lamellar surface can be obtained from the dependence of the d-spacing (d n ) on the number of methylene groups in the side chain (n). [26][27][28][29] In the composite bilayer film, the d-spacing shows good linearity with tail length, indicating similar packing modes in the bilayer film irrespective of alkyl chain length, and the linear relationship between d n and n is written as d n ~1.30n 1 12.28. The slope and intercept of the equation reflect the contribution of alkyl chain and EuW 10 layer plus the surfactant headgroup to the bilayer thickness (d n ), respectively.…”

Section: X-ray Diffractionmentioning

confidence: 97%

Highly ordered photoluminescent self-assembled films based on polyoxotungstoeuropate complex Na9[EuW10O36]Electronic supplementary information (ESI) available: IR, absorption and emission spectra, XRD pattern and SEM image of EuW10–C16TA film. See www.rsc.org/suppdata/jm/b2/b210965d/

Zhang

et al. 2003

J. Mater. Chem.

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A novel highly ordered layered superlattice multibilayer film is prepared by casting the chloroform solutions of ionic complex between a polyoxotungstoeuropate anion EuW 10 O 36 92 (EuW 10 ) and a hexadecyltrimethylammonium cation (C 16 TA) on hydrophilic substrates. A variety of techniques, including FT-IR and UV-vis spectroscopies, differential scanning calorimetry (DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) have been used to characterize the structure of the composite film. The lamellae consist of alternating layers of polyoxotungstoeuropate and bimolecular layers of surfactant, with the surfactant alkyl chains tilted 30.8u to the lamellar surface and noninterdigititated. The photoluminescent behavior of the film at room temperature has also been investigated by fluorescence spectroscopy to show the characteristic Eu 31 emission pattern of 5 D 0 A 7 F j . The fluorescence spectra and fluorescence lifetime of the composite film are quite different from those found for EuW 10 solid powder and EuW 10 dilute aqueous solution.{Electronic supplementary information (ESI) available: IR, absorption and emission spectra, XRD pattern and SEM image of EuW 10 -C 16 TA film. See www.

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“…Three-layers of kinked alkyl chains are only observed with highly charged smectites (e.g. beidellite, Lagaly et al, 1970Lagaly et al, , 1976. The different types can easily be detected by their basal spacings.…”

Section: Alkylammonium Ion Exchangementioning

confidence: 99%

Characterization of clays by organic compounds

1981

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A B S T R ACT: Many problems--from soil research to ceramics--require a reliable characterization of the clay minerals involved. This can be done using four clay-organic reactions: (i) staining tests and dye adsorption; (ii) glycerol and glycol adsorption; (iii) intercalation; (iv) alkylammonium ion exchange. Dye adsorption (staining tests) and glycerol adsorption allow a preliminary identification of the clay mineral groups. Intercalation reactions indicate minute differences between kaolins which cannot be detected by XRD and DTA. Alkylammonium ion exchange provides the best method for characterizing smectites and is sensitive to changes in the layer charge.About 1840, staining techniques were introduced in biological investigations. The availability of suitable staining tests was the decisive requirement for the detection of virus and bacillus infections. In 1882 Robert Koch detected the tubercle bacillus by staining with methylene blue. The importance of staining methods in biology and medicine induced some scientists to apply the tests in a quite different field of investigation, i.e. for identifying clay minerals. The first results were reported by Behrend in 1881; methylene blue rapidly became one of the most important dyes and has remained so until the present day.The staining tests developed in the 19th century may be considered the basis for the identification of clays by organic reactions. Today, three additional reactions allow a very detailed characterization of clay minerals. These are: the adsorption of neutral molecules, commonly ethylene glycol and glycerol (Bradley, 1945; McEwan, 1948), the intercalation of neutral molecules in kaolins (Wada, 1961;Weiss, 1961) and the exchange of interlayer cations by alkylammonium ions in three-layer clay minerals (Weiss & Kantner, 1960). FOUR REACTIONS FOR CHARACTERIZING CLAY MINERALS Adsorption of dyes and staining tests

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N‐n‐Alkylpyridinium Derivatives of Mica‐Type Layer Silicates

Abstract: eThis paper deals with the cation exchange of N-n -aIkylpyridinium ions e N-CH 2-CH2 -•.• CHg against inorganic ions in mica type layer silicates. The arrangements ofthese ions in the interlayer space is derived from basal spacing measurements.

Cited by 18 publications

References 20 publications

Organized Nanostructured Complexes of Polyoxometalates and Surfactants that Exhibit Photoluminescence and Electrochromism

Organized Nanostructured Complexes of Polyoxometalates and Surfactants that Exhibit Photoluminescence and Electrochromism

Highly ordered photoluminescent self-assembled films based on polyoxotungstoeuropate complex Na9[EuW10O36]Electronic supplementary information (ESI) available: IR, absorption and emission spectra, XRD pattern and SEM image of EuW10–C16TA film. See www.rsc.org/suppdata/jm/b2/b210965d/

Characterization of clays by organic compounds

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