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Kotenkov, S. A., Gnezdilov, O. I., Khaliullina, A. V., Antzutkin, O., Gimatdinov, R. S. & Filippov, A. (2019). Effect of Cholesterol and Curcumin on Ordering of DMPC Bilayers. Applied Magnetic Resonance, 50(1-3), 511-520
Open this publication in new window or tab >>Effect of Cholesterol and Curcumin on Ordering of DMPC Bilayers
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2019 (English)In: Applied Magnetic Resonance, ISSN 0937-9347, E-ISSN 1613-7507, Vol. 50, no 1-3, p. 511-520Article in journal (Refereed) Published
Abstract [en]

In this work, we compared the effects of curcumin and cholesterol directly competing to insert into the DMPC lipid bilayer during bilayer formation from an initially non-ordered state. 2H and 14N nuclear magnetic resonance spectroscopy showed that curcumin is not embedded deep in the lipid bilayer and interacts mainly with the head group of the lipid. In a more complex system of DMPC/CHOL/CUR, curcumin amplifies the effect of cholesterol on the ordering of lipid acyl chains.

Place, publisher, year, edition, pages
Springer, 2019
National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-72752 (URN)10.1007/s00723-018-1102-2 (DOI)000458124800036 ()2-s2.0-85057198967 (Scopus ID)
Note

Validerad;2019;Nivå 2;2019-03-08 (johcin)

Available from: 2019-01-31 Created: 2019-01-31 Last updated: 2019-03-08Bibliographically approved
Rohlmann, P., Munavirov, B., Furó, I., Antzutkin, O., Rutland, M. W. & Glavatskih, S. (2019). Non-halogenated Ionic Liquid Dramatically Enhances Tribological Performance of Biodegradable Oils. Frontiers in Chemistry, 7, Article ID 98.
Open this publication in new window or tab >>Non-halogenated Ionic Liquid Dramatically Enhances Tribological Performance of Biodegradable Oils
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2019 (English)In: Frontiers in Chemistry, E-ISSN 2296-2646, Vol. 7, article id 98Article in journal (Refereed) Published
Abstract [en]

It is demonstrated that a phosphonium orthoborate ionic liquid may serve as a wear reducing additive in biodegradable oils at steel-steel surfaces in the boundary lubrication regime. Tribological tests were performed in a ball-on-three plate configuration. A set of surface characterization techniques—SEM/EDS, FIB and white light interferometry were used to characterize surfaces following the tribotests and to observe the formation of any tribofilms. 11B NMR was used to follow changes in the composition of the ionic-liquid-oil blends and to identify boron-containing decomposition products after the tribotests. The ionic liquid reduces the wear of steel surfaces by up to 92% compared to the neat oil at 90°C; it is shown that the reduction in wear can be correlated with the formation of boron enriched patches in the boundary films.

Place, publisher, year, edition, pages
Laussanne: Frontiers Media S.A., 2019
Keywords
NMR, biodegradable oil, boundary lubrication, friction, ionic liquid, wear
National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-73314 (URN)10.3389/fchem.2019.00098 (DOI)000459858200001 ()30891442 (PubMedID)
Note

Validerad;2019;Nivå 2;2019-03-26 (oliekm)

Available from: 2019-03-26 Created: 2019-03-26 Last updated: 2019-04-11Bibliographically approved
Filippov, A., Gnezdilov, O. I., Luchkin, A. G. & Antzutkin, O. (2019). Self-diffusion of ethylammonium nitrate ionic liquid confined between modified polar glasses. Journal of Molecular Liquids, 284, 366-371
Open this publication in new window or tab >>Self-diffusion of ethylammonium nitrate ionic liquid confined between modified polar glasses
2019 (English)In: Journal of Molecular Liquids, ISSN 0167-7322, E-ISSN 1873-3166, Vol. 284, p. 366-371Article in journal (Refereed) Published
Abstract [en]

Ethylammonium nitrate (EAN) ionic liquid confined between flat polar glass platesdemonstrates variable diffusivity that is sensitive to an external static magnetic field. Outside the magnetic field, diffusivity between the plates is higher than that in the bulk. However, after placing the system in a strong static magnetic field, the diffusivity gradually decreased. These processes occur during transformations between phases formed in EAN subjected to micrometer-size restrictions outside and within the magnetic field (Filippov et al., JMolLiq. [2018] 268, 49). In this study, we used samples of two types: (i) with roughened surface formed by treatment of the glass plates with aqueous solutions of hydrofluoric acid and (ii) with vacuum deposited TiO2 layers with a thickness of ca. 1 μm at glass-plate edges. Neither the surface modification of the glass plates, nor the TiO2 layers controlled thickness of EAN confined between glass-plates significantly changed the above-described effects, which have been observed in studies using untreated glass plates. Therefore, the range of systems with detected phase transformations in EAN and accompanying effects, such as accelerated diffusivity and change in diffusivity under the influence of a static magnetic field, was expanded to the systems with roughened surfaces and the systems with TiO2 layers controlled inter-plates distances. Results of experiments with roughened surfaces additionally suggested that the phase transformation of confined EAN in the external magnetic field is isotropic in nature rather than a phase transition from “layered to bulk” structures.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Nuclear magnetic resonance, DiffusivityIon dynamics, Phase transformations, Restricted diffusion
National Category
Physical Chemistry
Research subject
Chemistry of Interfaces; Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-73599 (URN)10.1016/j.molliq.2019.04.021 (DOI)
Note

Validerad;2019;Nivå 2;2019-04-11 (johcin)

Available from: 2019-04-11 Created: 2019-04-11 Last updated: 2019-04-11Bibliographically approved
Loseva, O., Rodina, T., Antzutkin, O. & Ivanov, A. (2018). Chemisorption Activity of Mercury(II) Cyclopentamethylenedithiocarbamate: Synthesis, Structure, and Thermal Behavior of the [Hg2{S2CN(CH2)5}4] and [Au3{S2CN(CH2)5}6][Au{S2CN(CH2)5}2][Hg2Cl6]2 Complexes. Russian journal of general chemistry, 88(12), 2540-2549
Open this publication in new window or tab >>Chemisorption Activity of Mercury(II) Cyclopentamethylenedithiocarbamate: Synthesis, Structure, and Thermal Behavior of the [Hg2{S2CN(CH2)5}4] and [Au3{S2CN(CH2)5}6][Au{S2CN(CH2)5}2][Hg2Cl6]2 Complexes
2018 (English)In: Russian journal of general chemistry, ISSN 1070-3632, E-ISSN 1608-3350, Vol. 88, no 12, p. 2540-2549Article in journal (Refereed) Published
Abstract [en]

The dinuclear complex mercury(II) cyclopentamethylenedithiocarbamate (piperidine-1-carbodithioate) [Hg2{S2CN(CH2)5}4] was synthesized and its chemisorption activity toward a solution of AuCl3 in 2 M HCl was studied. The chemisorption of gold from the solution forms an ionic gold(III)‒mercury(II) dithiocarbamato-chlorido complex comprising three isomeric gold cations and an unsymmetrical hexachlorodimercurate anion. The structural organization and thermal behavior of the resulting compounds was studied.

Place, publisher, year, edition, pages
Springer, 2018
Keywords
mercury(II) alkylenedithiocarbamates, chemisorption activity, gold(III)‒mercury(II) double complexes, secondary Au···S bonds
National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-73595 (URN)10.1134/S1070363218120149 (DOI)000462933000014 ()2-s2.0-85063604736 (Scopus ID)
Note

Validerad;2019;Nivå 2;2019-04-11 (johcin)

Available from: 2019-04-11 Created: 2019-04-11 Last updated: 2019-04-17Bibliographically approved
Ivanov, A. V., Gerasimenko, A., Egorova, I., Zaeva, A., Novikova, E., Rodionova, N., . . . Antzutkin, O. (2018). Chemisorption Synthesis of the Ion-Polymeric Heteronuclear Gold(III)-Bismuth(III) Complex ([Au{S2CN(C3H7)2}2]3[Bi2Cl9])n Based on [Bi2{S2CN(C3H7)2}6]: 13C MAS NMR, Supramolecular Structure, and Thermal Behavior. Russian journal of coordination chemistry, 44(8), 518-531
Open this publication in new window or tab >>Chemisorption Synthesis of the Ion-Polymeric Heteronuclear Gold(III)-Bismuth(III) Complex ([Au{S2CN(C3H7)2}2]3[Bi2Cl9])n Based on [Bi2{S2CN(C3H7)2}6]: 13C MAS NMR, Supramolecular Structure, and Thermal Behavior
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2018 (English)In: Russian journal of coordination chemistry, ISSN 1070-3284, E-ISSN 1608-3318, Vol. 44, no 8, p. 518-531Article in journal (Refereed) Published
Abstract [en]

Chemisorption synthesis on the basis of the binuclear compound [Bi2{S2CN(C3H7)2}6] (I) and preparative isolation of the ion-polymeric heteronuclear gold(III)-bismuth(III) complex ([Au{S2CN(C3H7)2}2]3[Bi2Cl9])n (II) are carried out. Compounds I and II are characterized in comparison by IR spectroscopy and 13C CP-MAS NMR. According to the X-ray diffraction analysis data (CIF file CCDC no. 1407705), the cationic moiety of compound II exhibits an unusually complicated supramolecular structure including six isomeric noncentrosymmetric complex cations [Au{S2CN(C3H7)2}2]+ (hereinafter A-F) and two binuclear anions [Bi2Cl9]3- as conformers. The isomeric gold(III) cations perform various structural functions. Owing to pair secondary interactions Au···S, cations B, C, E, and F form centrosymmetric ([E···E], [F···F]) and noncentrosymmetric ([B···C]) binuclear aggregates [Au2{S2CN(C3H7)2}4]2+, whereas cations A and D are not involved in dimerization. The strongest secondary Au···S bonds are formed between the binuclear and mononuclear cations, resulting in the formation of supramolecular cation-cationic polymer chains of two types: (⋅⋅⋅A⋅⋅⋅[B⋅⋅⋅C]⋅⋅⋅A⋅⋅⋅[B⋅⋅⋅C]⋅⋅⋅)n and (D⋅⋅⋅[E⋅⋅⋅E]⋅⋅⋅D⋅⋅⋅[F⋅⋅⋅F]⋅⋅⋅])n. In both chains, the gold atoms of the binuclear cations are characterized by a distorted octahedral coordination [S6], whereas in the mononuclear cations the gold atoms retain the square environment [S4]. The cation-anionic interactions are provided by secondary bonds Cl⋅⋅⋅S involving the terminal chlorine atoms of isomeric [Bi2Cl9]3- and the sulfur atoms of the binuclear cations [Au2{S2CN(C3H7)2}4]2+. The character of the thermal behavior of compounds I and II is studied by simultaneous thermal analysis with the identification of intermediate and final products of the thermal transformations. The thermolysis of compound I at 193-320°C is accompanied by the formation of Bi2S3 with an impurity of reduced metallic bismuth particles. The final products of the thermal transformations of compound II are reduced elemental gold and Bi2O3, and the thermal transformation intermediates are BiCl3 and Bi2S3.

Place, publisher, year, edition, pages
Springer, 2018
National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-70721 (URN)10.1134/S1070328418080043 (DOI)2-s2.0-85052590477 (Scopus ID)
Note

Validerad;2018;Nivå 2;2018-09-03 (andbra)

Available from: 2018-09-03 Created: 2018-09-03 Last updated: 2018-09-07Bibliographically approved
Filippov, A., Azancheev, N., Gibaydullin, A., Bhattacharyya, S., Antzutkin, O. N. & Shah, F. U. (2018). Dynamic Properties of Imidazolium Orthoborate Ionic Liquids Mixed with Polyethylene Glycol Studied by NMR Diffusometry and Impedance Spectroscopy. Magnetic Resonance in Chemistry, 56(2), 113-119
Open this publication in new window or tab >>Dynamic Properties of Imidazolium Orthoborate Ionic Liquids Mixed with Polyethylene Glycol Studied by NMR Diffusometry and Impedance Spectroscopy
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2018 (English)In: Magnetic Resonance in Chemistry, ISSN 0749-1581, E-ISSN 1097-458X, Vol. 56, no 2, p. 113-119Article in journal (Refereed) Published
Abstract [en]

We used 1H pulsed field gradient (PFG) NMR to study the self-diffusion of polyethylene glycol (PEG) with average molecular mass of 200 and ions in mixtures of PEG with imidazolium bis(mandelato)borate (BMB) and imidazolium bis(oxalato)borate (BOB) ionic liquids (ILs). The ionic liquid was mixed with PEG in the concentration range of 0–100 wt%. Within the temperature range of 295 to 353 K, the diffusion coefficient of BMB is slower than that of the imidazolium cation. The diffusion coefficients of PEG, as well as the imidazolium cation and BMB anions, differ under all experimental conditions tested. This demonstrates that the IL in the mixture is present in at least a partially dissociated state. Generally, increasing the concentration of PEG leads to an increase in the diffusion coefficients of PEG and both the ions, and decreases their activation energy for diffusion. NMR chemical shift alteration analysis showed that the presence of PEG changes the chemical shifts of both ions but in different directions. Impedance spectroscopy was used to measure the ionic conductivity of the ionic liquids mixed with PEG.

Place, publisher, year, edition, pages
John Wiley & Sons, 2018
National Category
Chemical Sciences Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-64929 (URN)10.1002/mrc.4636 (DOI)000419519200009 ()28752526 (PubMedID)2-s2.0-85040248332 (Scopus ID)
Note

Validerad;2018;Nivå 2;2018-01-09 (svasva)

Available from: 2017-07-31 Created: 2017-07-31 Last updated: 2018-12-14Bibliographically approved
Filippov, A., Kurakin, S., Gnezdilov, O. & Antzutkin, O. (2018). Effect of magnetic field on diffusion of ethylammonium nitrate: water mixtures confined between polar glass plates. Journal of Molecular Liquids, 4, 45-51
Open this publication in new window or tab >>Effect of magnetic field on diffusion of ethylammonium nitrate: water mixtures confined between polar glass plates
2018 (English)In: Journal of Molecular Liquids, ISSN 0167-7322, E-ISSN 1873-3166, Vol. 4, p. 45-51Article in journal (Refereed) Published
Abstract [en]

We used 1H NMR diffusometry to study mixtures of ethylammonium nitrate (EAN) with water (3.1–12.4 mol% of added H2O) confined between polar glass plates and exposed to a static magnetic field of 9.4 T. The presence of such restrictions reverses the concentration dependence of the diffusivities of the EA (ethylammonium) cation and water typical for the bulk system. The presence of water weakens the effects of a static magnetic field on diffusion of the EA cation as well as on proton exchange of –NH3 groups. Surprisingly, the amplitude of the echo signal of water protons decreases during exposure to the magnetic field and finally disappears, a phenomenon that depends on the concentration of water in the system. Based on experimental data, we suggest that water in the system is present in two states with different dynamic properties. One type of water formed in confinement possesses NMR relaxation time typical for liquids; its diffusivity can be measured by 1H NMR. The second type of water is formed upon exposure of the sample of the first type to the magnetic field and eventually includes all the water in the system. This type of water possesses “solid-like” NMR relaxation features that makes it “invisible” to the NMR diffusometry technique. We suggest that this second type of water is adsorbed onto the glass plates. Correspondingly, EAN exists in two liquid phases: the first one contains an EAN-water mixture, while the second one contains neat EAN, and forms on the microscopic scale range under the influence of a static magnetic field.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Nuclear magnetic resonance, Diffusivity, Ion dynamics, Water diffusion
National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-71407 (URN)10.1016/j.molliq.2018.10.080 (DOI)000457660000005 ()2-s2.0-85055148175 (Scopus ID)
Note

Validerad;2018;Nivå 2;2018-11-01 (svasva)

Available from: 2018-11-01 Created: 2018-11-01 Last updated: 2019-03-08Bibliographically approved
Shah, F. U., Holmgren, A., Rutland, M. W., Glavatskih, S. & Antzutkin, O. (2018). Interfacial Behavior of Orthoborate Ionic Liquids at Inorganic Oxide Surfaces Probed by NMR, IR and Raman Spectroscopy. The Journal of Physical Chemistry C, 122(34), 19687-19698
Open this publication in new window or tab >>Interfacial Behavior of Orthoborate Ionic Liquids at Inorganic Oxide Surfaces Probed by NMR, IR and Raman Spectroscopy
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2018 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 122, no 34, p. 19687-19698Article in journal (Refereed) Published
Abstract [en]

Absorption modes and reactivity of non-halogenated ionic liquids (ILs) at inorganic oxide surfaces of γ-Al2O3, MgO and SiO2 particles were characterized using multinuclear (11B, 31P and 29Si) solid-state magic-angle-spinning NMR, FTIR and Raman spectroscopy. ILs are composed of the trihexyl(tetradecyl)phosphonium cation, [P6,6,6,14]+, and bis(mandelato)borate, [BMB]-, or bis(salicylato)borate, [BScB]-, anions. Spectroscopic measurements were performed on room temperature (298 K) samples and samples exposed to 15 hours of heating at 373 K. The single pulse 11B NMR data of heated [P6,6,6,14][BMB] mixed with the inorganic oxides showed a significant change in spectra of the anion for all three oxides. In contrast, no such spectral changes were detected for heated [P6,6,6,14][BScB] mixed with the inorganic oxides. 31P MAS NMR data for the IL/metal oxide systems revealed interactions between [P6,6,6,14]+ and the surfaces of oxides. A significant intensity of 31P CP-MAS NMR signals indicated a low mobility of cations in these systems. The existence of strongly adhered surface layers of ILs on SiO2 particles was also confirmed by 1H-29Si CP-MAS NMR spectroscopy. FTIR and Raman spectroscopic data revealed strong interactions between the anions and the inorganic surfaces and there is strong correlation with the data obtained from NMR spectroscopy. Although their chemical structures are rather similar, the [BScB]- anion is more stable than the [BMB]- anion at the inorganic oxide surface.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018
National Category
Physical Chemistry Chemical Process Engineering
Research subject
Chemistry of Interfaces; Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-70194 (URN)10.1021/acs.jpcc.8b06049 (DOI)000443923500041 ()2-s2.0-85052316588 (Scopus ID)
Note

Validerad;2018;Nivå 2;2018-10-05 (johcin)

Available from: 2018-08-01 Created: 2018-08-01 Last updated: 2018-12-14Bibliographically approved
Antzutkin, O. (2018). Polymorphism of Alzheimer’s Aβ Amyloid Fibrils and Oligomers. In: Graham A. Webb (Ed.), Modern Magnetic Resonance: (pp. 333-347). Cham: Springer
Open this publication in new window or tab >>Polymorphism of Alzheimer’s Aβ Amyloid Fibrils and Oligomers
2018 (English)In: Modern Magnetic Resonance / [ed] Graham A. Webb, Cham: Springer, 2018, p. 333-347Chapter in book (Refereed)
Abstract [en]

An overview of the strategy and experimental solid-state NMR, TEM, STEM, and AFM methods useful for obtaining atomic-level-resolution structural models of Alzheimer’s amyloid-β peptide fibrils and oligomers is presented. Polymorphism of amyloid fibrils and oligomers and the relevance to neurotoxicity is discussed.

Place, publisher, year, edition, pages
Cham: Springer, 2018
National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-69562 (URN)10.1007/978-3-319-28388-3_31 (DOI)2-s2.0-85054408879 (Scopus ID)978-3-319-28387-6 (ISBN)978-3-319-28388-3 (ISBN)
Available from: 2018-06-15 Created: 2018-06-15 Last updated: 2018-10-16Bibliographically approved
Filippov, A., Gnezdilov, O. I. & Antzutkin, O. (2018). Static magnetic field alters properties of confined alkylammonium nitrate ionic liquids. Journal of Molecular Liquids, 268, 49-54
Open this publication in new window or tab >>Static magnetic field alters properties of confined alkylammonium nitrate ionic liquids
2018 (English)In: Journal of Molecular Liquids, ISSN 0167-7322, E-ISSN 1873-3166, Vol. 268, p. 49-54Article in journal (Refereed) Published
Abstract [en]

Ethylammonium nitrate (EAN) and propylammonium nitrate (PAN) ionic liquids confined between polar glass plates and exposed to a strong magnetic field of 9.4 T demonstrate gradually slowing diffusivity, a process that can be reversed by removing the sample from the magnetic field. The process can be described well by the Avrami equation, which is typical for autocatalytic (particularly, nucleation controlled) processes. The transition can be stopped by freezing the sample. Cooling and heating investigations showed differences in the freezing and melting behavior of the sample depending on whether it had been exposed to the magnetic field. After exposure to the magnetic field, the sample demonstrated decrease in the 1H NMR signal of residual water. 1H NMR spectroscopy with presaturation demonstrates that the most probable mechanism of the decrease of the bulk water signal is adsorption of water on polar surfaces of glass plates. Generally, our findings confirm our previous suggestion that alteration of the dynamic properties of confined alkylammonium nitrate ionic liquids exposed to a magnetic field is related to the alteration of real physical-chemical phases

Place, publisher, year, edition, pages
Elsevier, 2018
National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-70220 (URN)10.1016/j.molliq.2018.07.027 (DOI)000447817400006 ()2-s2.0-85049811484 (Scopus ID)
Note

Validerad;2018;Nivå 2;2018-08-06 (andbra)

Available from: 2018-08-06 Created: 2018-08-06 Last updated: 2018-11-15Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0003-1067-7990

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