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Shchukarev, Andrey
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Publications (10 of 140) Show all publications
Gustafson, K. P. J., Gorbe, T., de Gonzalo-Calvo, G., Yuan, N., Schreiber, C. L., Shchukarev, A., . . . Backvall, J.-E. (2019). Chemoenzymatic Dynamic Kinetic Resolution of Primary Benzylic Amines using Pd-0-CalB CLEA as a Biohybrid Catalyst. Chemistry - A European Journal, 25(39), 9174-9179
Open this publication in new window or tab >>Chemoenzymatic Dynamic Kinetic Resolution of Primary Benzylic Amines using Pd-0-CalB CLEA as a Biohybrid Catalyst
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2019 (English)In: Chemistry - A European Journal, ISSN 0947-6539, E-ISSN 1521-3765, Vol. 25, no 39, p. 9174-9179Article in journal (Refereed) Published
Abstract [en]

Herein, we report on the use a biohybrid catalyst consisting of palladium nanoparticles immobilized on cross-linked enzyme aggregates of lipase B of Candida antarctica (CalB CLEA) for the dynamic kinetic resolution (DKR) of benzylic amines. A set of amines were demonstrated to undergo an efficient DKR and the recyclability of the catalysts was studied. Extensive efforts to further elucidate the structure of the catalyst are presented.

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH, 2019
Keywords
amides, biohybrid catalysts, dynamic kinetic resolution, heterogeneous catalysis, key cross-linked zyme aggregates
National Category
Organic Chemistry
Identifiers
urn:nbn:se:umu:diva-162000 (URN)10.1002/chem.201901418 (DOI)000475680200007 ()31050831 (PubMedID)
Available from: 2019-08-13 Created: 2019-08-13 Last updated: 2019-08-13Bibliographically approved
Kwong, W. L., Lee, C. C., Shchukarev, A. & Messinger, J. (2019). Cobalt- doped hematite thin films for electrocatalytic water oxidation in highly acidic media. Chemical Communications, 55(34), 5017-5020
Open this publication in new window or tab >>Cobalt- doped hematite thin films for electrocatalytic water oxidation in highly acidic media
2019 (English)In: Chemical Communications, ISSN 1359-7345, E-ISSN 1364-548X, Vol. 55, no 34, p. 5017-5020Article in journal (Refereed) Published
Abstract [en]

Earth-abundant cobalt-doped hematite thin-film electrocatalysts were explored for acidic water oxidation. The strategically doped hematite produced a stable geometric current density of 10 mA cm(-2) for up to 50 h at pH 0.3, as a result of Co-enhanced intrinsic catalytic activity and charge transport properties across the film matrix.

Place, publisher, year, edition, pages
The Royal Society of Chemistry, 2019
National Category
Materials Chemistry
Identifiers
urn:nbn:se:umu:diva-159862 (URN)10.1039/c9cc01369e (DOI)000468618000025 ()30968887 (PubMedID)
Available from: 2019-06-10 Created: 2019-06-10 Last updated: 2019-06-12Bibliographically approved
Cano, A., Lartundo-Rojas, L., Shchukarev, A. & Reguera, E. (2019). Contribution to the coordination chemistry of transition metal nitroprussides: a cryo-XPS study. New Journal of Chemistry, 43(12), 4835-4848
Open this publication in new window or tab >>Contribution to the coordination chemistry of transition metal nitroprussides: a cryo-XPS study
2019 (English)In: New Journal of Chemistry, ISSN 1144-0546, E-ISSN 1369-9261, Vol. 43, no 12, p. 4835-4848Article in journal (Refereed) Published
Abstract [en]

The series of coordination polymers under investigation was formed by the assembly of a pentacyanonitrosylferrate(ii) anionic block, [Fe(CN)(5)NO](2-), through monovalent and divalent transition metal ions, e.g. Mn2+, Fe2+, Co2+, Ni2+, Cu2+, Zn2+, Cd2+, Hg2+ and Ag+. For divalent ions, the resulting materials have a 3D porous framework with attractive features for applications in gas storage and separation, as electroactive solids, light-driven molecular magnets, and so on; in this study, we report the results obtained for a series of coordination polymers using the cryogenic X-ray photoelectron spectroscopy (cryo-XPS) data; comprehensive details regarding their coordination chemistries were obtained from the acquired spectra in addition to their comparison with the structural and spectroscopic information obtained from other techniques. The results discussed herein are original and contribute towards the understanding of the electronic structures and related properties for this family of coordination polymers. This series of solids was found to be highly susceptible to strong damage induced by X-ray beams throughout the conventional XPS experiment; therefore, the analysis was conducted under cryogenic conditions.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2019
National Category
Physical Chemistry
Identifiers
urn:nbn:se:umu:diva-158089 (URN)10.1039/c9nj00141g (DOI)000462541900019 ()
Available from: 2019-04-15 Created: 2019-04-15 Last updated: 2019-04-15Bibliographically approved
Li, M.-B., Posevins, D., Gustafson, K. P. J., Tai, C.-W., Shchukarev, A., Qiu, Y. & Backvall, J.-E. (2019). Diastereoselective Cyclobutenol Synthesis: A Heterogeneous Palladium-Catalyzed Oxidative Carbocyclization-Borylation of Enallenols. Chemistry - A European Journal, 25(1), 210-215
Open this publication in new window or tab >>Diastereoselective Cyclobutenol Synthesis: A Heterogeneous Palladium-Catalyzed Oxidative Carbocyclization-Borylation of Enallenols
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2019 (English)In: Chemistry - A European Journal, ISSN 0947-6539, E-ISSN 1521-3765, Vol. 25, no 1, p. 210-215Article in journal (Refereed) Published
Abstract [en]

A highly selective and efficient oxidative carbocyclization/borylation of enallenols catalyzed by palladium immobilized on amino-functionalized siliceous mesocellular foam (Pd-AmP-MCF) was developed for diastereoselective cyclobutenol synthesis. The heterogeneous palladium catalyst can be recovered and recycled without any observed loss of activity or selectivity. The high diastereoselectivity of the reaction is proposed to originate from a directing effect of the enallenol hydroxyl group. Optically pure cyclobutenol synthesis was achieved by the heterogeneous strategy by using chiral enallenol obtained from kinetic resolution.

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2019
Keywords
cyclobutenols, diastereoselectivity, enallenols, heterogeneous catalysis, oxidative carbocyclization, palladium
National Category
Organic Chemistry
Identifiers
urn:nbn:se:umu:diva-155638 (URN)10.1002/chem.201805118 (DOI)000454705500025 ()30307089 (PubMedID)
Funder
EU, European Research Council, ERC AdG 247014Swedish Research Council, 2016-03897Berzelii Centre EXSELENTKnut and Alice Wallenberg Foundation
Available from: 2019-01-25 Created: 2019-01-25 Last updated: 2019-01-25Bibliographically approved
Cano, A., Rodríguez-Hernández, J., Shchukarev, A. & Reguera, E. (2019). Intercalation of pyrazine in layered copper nitroprusside: synthesis, crystal structure and XPS study. Journal of Solid State Chemistry, 273, 1-10
Open this publication in new window or tab >>Intercalation of pyrazine in layered copper nitroprusside: synthesis, crystal structure and XPS study
2019 (English)In: Journal of Solid State Chemistry, ISSN 0022-4596, E-ISSN 1095-726X, Vol. 273, p. 1-10Article in journal (Refereed) Published
Abstract [en]

Hybrid inorganic–organic solids form an interesting family of functional materials, where their functionalities are determined by both, the inorganic and organic building blocks. This study reports the intercalation of pyrazine in 2D copper nitroprusside, the crystal structure of the resulting hybrid solid and explores the scope of cryogenic X-ray photoelectron spectroscopy (XPS) to shed light on its electronic structure. In this material, the pyrazine molecule appears coordinated to Cu atoms from neighboring layers, to form the columns in the resulting 3D porous framework. Its crystal structure was solved and refined from the corresponding XRD powder pattern. XPS data, recorded under cryogenic conditions, provided fine details on the electronic structure of this hybrid solid. The binding energy values for the ligand atoms and the involved metals show a definite correlation with the structural data and FT-IR spectra. When XPS spectra were recorded at room temperature, a significant sample decomposition was observed. Three possible mechanisms for the sample damage during the XPS experiment are considered. The hybrid material under study is representative of a wide series of nanoporous solids obtained by intercalation of organic pillars between 2D inorganic solids.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Hybrid inorganic-organic solid, Cryo-XPS, Sample degradation, Electronic and crystal structure, Transition metal nitroprussides, Pyrazine intercalation
National Category
Materials Chemistry
Identifiers
urn:nbn:se:umu:diva-157021 (URN)10.1016/j.jssc.2019.02.015 (DOI)000466261100001 ()2-s2.0-85061800990 (Scopus ID)
Available from: 2019-03-06 Created: 2019-03-06 Last updated: 2019-05-20Bibliographically approved
Nuri, A., Mansoori, Y., Bezaatpour, A., Shchukarev, A. & Mikkola, J.-P. (2019). Magnetic Mesoporous SBA-15 Functionalized with a NHC Pd(II) Complex: An Efficient and Recoverable Nanocatalyst for Hiyama Reaction. ChemistrySelect, 4(5), 1820-1829
Open this publication in new window or tab >>Magnetic Mesoporous SBA-15 Functionalized with a NHC Pd(II) Complex: An Efficient and Recoverable Nanocatalyst for Hiyama Reaction
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2019 (English)In: ChemistrySelect, ISSN 2365-6549, Vol. 4, no 5, p. 1820-1829Article in journal (Refereed) Published
Abstract [en]

Magnetite nanoparticles (MNPs) were covered by a silica shell and then embedded into mesoporous silica (SBA‐15). Magnetic mesoporous silica (Fe3O4@SiO2‐SBA) was then reacted with 3‐chloropropyltriethoxysilane (CPTS), sodium salt of imidazole and 2‐bromopyridine to give Fe3O4@SiO2‐SBA functionalized with 3‐(pyridin‐2‐yl)‐1H‐imidazol‐3‐ium‐propyl (PIP) as a supported pincer ligand for Pd(II). The functionalized magnetic mesoporous silica were then treated with t‐BuOK at −80 °C in THF and then reacted with [PdCl2(SMe2)2] to give supported Pd(II)‐carbene complex containing C,N‐bidentate ligand. The chloride ions were then exchanged by bromide ions using a NaBr solution of diethylether/acetone mixture. The prepared catalyst was characterized with, FT‐IR, thermo gravimetric analysis (TGA), scanning electron microscopy (SEM), transmission electron microscopy (TEM), vibrating sample magnetometry (VSM), Brunauer–Emmett–Teller surface area measurement (SBET), energy dispersive X‐ray analysis (EDX) and wide angle X‐ray diffraction spectroscopy (XRD). The prepared magnetic catalyst was effectively used in the coupling reaction of triethoxyphenylsilane with aryl halides (Hiyama reaction) in the presence of a base. The reaction parameters such as solvents, amount of catalyst, base and temperature were optimized. The catalyst was then magnetically decanted, washed, and reused several times.

Keywords
Carbene-pyridine Pd(II) complex, Heterogeneous catalyst, Hiyama reaction, Magnetic mesoporous nanoparticles
National Category
Materials Chemistry Physical Chemistry
Identifiers
urn:nbn:se:umu:diva-156875 (URN)10.1002/slct.201803798 (DOI)000458164500037 ()
Available from: 2019-03-11 Created: 2019-03-11 Last updated: 2019-03-11Bibliographically approved
Taheri, M., Ghiaci, M., Moheb, A. & Shchukarev, A. (2019). Organic–inorganic hybrid of anchored dicationic ionic liquid on Al-MCM-41-phosphovanadomolybdate toward selective oxidation of benzene to phenol. Applied organometallic chemistry, 33, Article ID e5012.
Open this publication in new window or tab >>Organic–inorganic hybrid of anchored dicationic ionic liquid on Al-MCM-41-phosphovanadomolybdate toward selective oxidation of benzene to phenol
2019 (English)In: Applied organometallic chemistry, ISSN 0268-2605, E-ISSN 1099-0739, Vol. 33, article id e5012Article in journal (Refereed) Published
Abstract [en]

A phosphovanadomolybdate hybridized with an anchored dicationic ionic liquid on Al-MCM-41 was prepared through the anion exchange and characterized by 1H and 13C NMR, FTIR, UV?Vis, XRD, XPS, TGA, TEM, FESEM, ICP-OES and BET techniques. The obtained data demonstrated that the composite is a porous material with the high surface area and also having a large pore volume which are 405 m2 g?1 and 0.616 cm3 g?1 respectively. The prepared composite has shown an acceptable catalytic activity for converting benzene selectively to phenol with hydrogen peroxide as eco-friendly oxidant. Under the optimized reaction conditions, the hybrid catalyst resulted in phenol yield of 14.8% with 100% selectivity and a TOF value of 20.0 h?1. The catalyst also revealed a desired recovery and reusability. The efficient performance of the composite is related to the textural and polyoxometalate properties.

Place, publisher, year, edition, pages
John Wiley & Sons, Ltd, 2019
Keywords
benzene, ionic liquid, oxidation, phenol, Phosphovanadomolybdate
National Category
Organic Chemistry
Identifiers
urn:nbn:se:umu:diva-160032 (URN)10.1002/aoc.5012 (DOI)000476573800054 ()
Available from: 2019-06-12 Created: 2019-06-12 Last updated: 2019-08-14Bibliographically approved
Masoud, T., Mehran, G. & Shchukarev, A. (2018). A comparison between two Pd‐Ni catalysts supported on two different supports toward Suzuki‐Miyaura coupling reaction. Paper presented at 2018/05/14. Applied organometallic chemistry, 32(5), Article ID e4338.
Open this publication in new window or tab >>A comparison between two Pd‐Ni catalysts supported on two different supports toward Suzuki‐Miyaura coupling reaction
2018 (English)In: Applied organometallic chemistry, ISSN 0268-2605, E-ISSN 1099-0739, Vol. 32, no 5, article id e4338Article in journal (Refereed) Published
Abstract [en]

When a single metal fails to promote an efficient Suzuki?Miyaura coupling reaction at ambient temperature, the synergistic cooperation of two distinct metals might improve the reaction. To examine the synergistic effect of palladium and nickel for catalyzing Suzuki coupling reaction, g?C3N4 supported metal nanoparticles of PdO, NiO and Pd?PdO?NiO were prepared, characterized and their catalytic activities evaluated over different aryl halides at room temperature and 78 °C. The morphological characterization of Pd?PdO?NiO/g?C3N4 demonstrated that the bimetallic particles were uniformly dispersed over the g?C3N4 layers with diameters ranging from 3.5?7.7 nm. XPS analysis showed that nanoparticles of Pd?PdO?NiO consisted of Pd(II), Pd(0) and Ni(II) sites. The experiments performed on the catalytic activity of Pd?PdO?NiO/g?C3N4 showed that the prepared catalyst demonstrated an efficient activity without using toxic solvents.

Place, publisher, year, edition, pages
Wiley-Blackwell, 2018
Keywords
graphitic carbon nitride, green chemistry, heterogeneous catalyst, Pd‐PdO‐NiO nanoparticles, Suzuki coupling reaction
National Category
Organic Chemistry
Identifiers
urn:nbn:se:umu:diva-147672 (URN)10.1002/aoc.4338 (DOI)000430461300027 ()2-s2.0-85044292758 (Scopus ID)
Conference
2018/05/14
Available from: 2018-05-14 Created: 2018-05-14 Last updated: 2018-10-29Bibliographically approved
Yu, C., Boily, J.-F., Shchukarev, A., Drake, H., Song, Z., Hogmalm, K. J. & Åström, M. E. (2018). A cryogenic XPS study of Ce fixation on nanosized manganite and vernadite: Interfacial reactions and effects of fulvic acid complexation. Chemical Geology, 483, 304-311
Open this publication in new window or tab >>A cryogenic XPS study of Ce fixation on nanosized manganite and vernadite: Interfacial reactions and effects of fulvic acid complexation
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2018 (English)In: Chemical Geology, ISSN 0009-2541, E-ISSN 1872-6836, Vol. 483, p. 304-311Article in journal (Refereed) Published
Abstract [en]

This study investigated interfacial reactions between aqueous Ce(III) and two synthetic nanosized Mn (hydr-)oxides (manganite: γ-MnOOH, and vernadite: δ-MnO2) in the absence and presence of Nordic Lake fulvic acid (NLFA) at circumneutral pH by batch experiments and cryogenic X-ray photoelectron spectroscopy (XPS). The surfaces of manganite and vernadite were negatively charged (XPS-derived loadings of (Na + K)/Cl > 1) and loaded with 0.42–4.33 Ce ions nm−2. Manganite stabilized Ce-oxidation states almost identical to those for vernadite (approximately 75% Ce(IV) and 25% Ce(III)), providing the first experimental evidence that also a Mn(III) phase (manganite) can act as an important scavenger for Ce(IV) and thus, contribute to the decoupling of Ce from its neighboring rare earth elements and the development of Ce anomaly. In contrast, when exposed to Ce(III)-NLFA complexes, the oxidation of Ce by these two Mn (hydr-)oxides was strongly suppressed, suggesting that the formation of Ce(III) complexes with fulvic acid can stabilize Ce(III) even in the presence of oxidative Mn-oxide surfaces. The experiments also showed that Ce(III) complexed with excess NLFA was nearly completely removed, pointing to a strong preferential sorption of Ce(III)-complexed NLFA over free NLFA. This finding suggests that the Ce(III)-NLFA complexes were most likely sorbed by their cation side, i.e. Ce(III) bridging between oxide groups on the Mn (hydr-)oxides and negatively-charged functional groups in NLFA. Hence, Ce(III) was in direct contact with the oxidative manganite and vernadite but despite that not oxidized. An implication is that in organic-rich environments there may be an absence of Ce(IV) and Ce anomaly despite otherwise favorable conditions for Ce(III) oxidation.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Cryogenic XPS, Manganite, Vernadite, Oxidative scavenging, Ce anomaly
National Category
Inorganic Chemistry
Identifiers
urn:nbn:se:umu:diva-146721 (URN)10.1016/j.chemgeo.2018.02.033 (DOI)000429492300027 ()2-s2.0-85042905870 (Scopus ID)
Available from: 2018-04-18 Created: 2018-04-18 Last updated: 2018-06-13Bibliographically approved
Taheri, M., Ghiaci, M. & Shchukarev, A. (2018). Cross-linked chitosan with a dicationic ionic liquid as a recyclable biopolymer-supported catalyst for cycloaddition of carbon dioxide with epoxides into cyclic carbonates. New Journal of Chemistry, 42(1), 587-597
Open this publication in new window or tab >>Cross-linked chitosan with a dicationic ionic liquid as a recyclable biopolymer-supported catalyst for cycloaddition of carbon dioxide with epoxides into cyclic carbonates
2018 (English)In: New Journal of Chemistry, ISSN 1144-0546, E-ISSN 1369-9261, Vol. 42, no 1, p. 587-597Article in journal (Refereed) Published
Abstract [en]

Development of eco-friendly, desirable and reusable catalysts particularly for reactions in regard to carbon dioxide fixation is still attractive in academic and industrial sectors. In this study, a dicationic ionic liquid was anchored to a cheap biopolymer, i.e., chitosan and the prepared hybrid composite was used in the cycloaddition reaction of CO2 with various epoxides for preparing five-membered cyclic carbonates under solvent-free conditions in high yield and selectivity without the addition any metal co-catalyst. The catalyst was characterized by 1H and 13C NMR, FTIR, UV-vis, XPS, TG, FESEM, and BET techniques. The catalyst was recovered and recycled at least five times without losing its activity and selectivity. Moreover, it has been demonstrated that chitosan through hydrogen bonding, coordination of amine groups with CO2 and also loosely bonded bromide ion to imidazolium ion have synergistic effects on the yield and selectivity of cyclic carbonates under optimum conditions. On the basis of the obtained results, a feasible mechanism was proposed for the reaction.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2018
National Category
Chemical Sciences
Identifiers
urn:nbn:se:umu:diva-143752 (URN)10.1039/C7NJ03665E (DOI)000418369000063 ()
Available from: 2018-01-08 Created: 2018-01-08 Last updated: 2018-06-09Bibliographically approved
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