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| 2. |
- Sranko, D., et al.
(författare)
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A SEM, EDX and XAS characterization of Ba(II)Fe(III) layered double hydroxides
- 2011
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Ingår i: Journal of Molecular Structure. - : Elsevier BV. - 0022-2860. ; 993:1-3, s. 62-66
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Konferensbidrag (refereegranskat)abstract
- The structural characteristics of Ba-Fe double hydroxides were studied by various methods, such as scanning electron microscopy (SEM), energy dispersive X-ray (EDX) fluorescence and X-ray absorption spectroscopies (XAS). It was verified that under hyperalkaline conditions (using 10 M or 20 M NaOH solution for precipitating the substances) layered double hydroxides could be prepared and the structure collapsed on heat treatment at 523 K. Important structural parameters could also be obtained through the quantitative analysis of the XAS spectrum of Ba3Fe-LDH made using 20 M NaOH for precipitating the material. (C) 2010 Elsevier B.V. All rights reserved.
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| 3. |
- Csendes, Z., et al.
(författare)
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Synthesis, structural characterisation, and catalytic activity of Mn(II)-protected amino acid complexes covalently immobilised on chloropropylated silica gel
- 2015
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Ingår i: Catalysis Today. - : Elsevier BV. - 0920-5861. ; 241, s. 264-269
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Tidskriftsartikel (refereegranskat)abstract
- In this work the syntheses, structure, superoxide dismutase (SOD) activity and the catalytic use in the oxidative transformations of cyclohexene of covalently grafted Mn(II)-complexes formed with various C-protected amino acid (L-histidine, L-cysteine and L-cystine) ligands are presented. The structural features of the surface complexes were studied by EPR, X-ray absorption, and mid/far IR spectroscopies. The superoxide dismutase activities of the materials were determined in a biochemical test reaction. The obtained materials were used as catalysts for the oxidation of cyclohexene with peracetic acid in acetone. Covalent grafting and building the complex onto the surface of the chloropropylated silica gel were successful in all cases. It was found that in many instances the structures obtained and the coordinating groups substantially varied upon changing the conditions of the syntheses. All the covalently immobilised Mn(II)-complexes displayed superoxide dismutase activity and could catalyse the oxidation of cyclohexene. (C) 2014 Elsevier B.V. All rights reserved.
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| 4. |
- Sranko, D. F., et al.
(författare)
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Radiation induced topotactic [2+2] dimerisation of acrylate derivatives among the layers of a CaFe layered double hydroxide followed by IR spectroscopy
- 2013
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Ingår i: Journal of Molecular Structure. - : Elsevier BV. - 0022-2860. ; 1044, s. 279-285
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Tidskriftsartikel (refereegranskat)abstract
- Various acrylates [E-phenylpropenoate, E-3(4'-nitrophenyl)propenoate, E-3(2',5'-difluorphenyl)propenoate, E-3(2'-thienyl)propenoate, E-3(4'-imidazolyl)propenoate or E-2,3-dimethylpropenoate] were successfully intercalated into Ca(II)Fe(III) layered double hydroxide (CaFe - LDH) verified by a range of instrumental methods. The possible arrangements for the organic anions were suggested on the basis of basal spacing data, layer thickness and the dimensions of the quantum chemically optimised structures of the acrylate ions. Using the acrylate CaFe LDHs as reactant-filled nanoreactors, photoinitiated topotactic [2 + 2] cyclisation reactions followed by IR spectroscopy could be performed with many representatives [E-phenylpropenoate-, E-3(4'-nitrophenyl)propenoate-, E-3(2',5'-difluorphenyl)propenoate- or E-3(2'-thienyl)propenoate-CaFe-LDHs] resulting in cyclobutane derivatives within the layers of the host material indicating that there were domains where the intercalated anions were in close proximity to each other and in proper arrangement for the reaction to occur. (C) 2012 Elsevier B.V. All rights reserved.
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