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Bús C, Kocsis M, Ágoston Á, Kukovecz Á, Kónya Z, Sipos P. Application of Alcohols to Inhibit the Formation of Ca(II) Dodecyl Sulfate Precipitate in Aqueous Solutions. Materials (Basel) 2024; 17:1806. [PMID: 38673163 PMCID: PMC11051115 DOI: 10.3390/ma17081806] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2024] [Revised: 04/10/2024] [Accepted: 04/11/2024] [Indexed: 04/28/2024]
Abstract
The presence of alkaline earth cations, in particular, Ca2+ and Mg2+ ions in brine, causes undesired effects in solutions containing anionic surfactants because of precipitate formation. In the present study, an anionic surfactant, sodium dodecyl sulfate (SDS), was investigated, focusing on the determination of various properties (surface tension, critical micelle concentration, micelle size, turbidity) in the presence of alcohols and, in particular, the inhibition of the precipitation of SDS with calcium ions. The calcium ions were added to the surfactant in increasing concentrations (3.0-10.0 g/L), and short-carbon-chain alcohols (methanol, ethanol, n-propanol and n-butanol) were used to shift the onset of precipitate formation. The critical micelle concentration (CMC) of SDS in the presence of alcohols was also determined. It was established that among these alcohols, methanol and ethanol did not exert significant effects on the solubility of the Ca(DS)2 precipitate, while n-propanol and n-butanol were found to be much more efficient inhibitors. In addition, all the alcohols in the applied concentration range (up to 20 V/V%) were found to decrease the critical micelle concentration of SDS.
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Affiliation(s)
- Csaba Bús
- Department of Molecular and Analytical Chemistry, University of Szeged, Dóm Square 7-8, 6720 Szeged, Hungary; (C.B.); (M.K.)
| | - Marianna Kocsis
- Department of Molecular and Analytical Chemistry, University of Szeged, Dóm Square 7-8, 6720 Szeged, Hungary; (C.B.); (M.K.)
| | - Áron Ágoston
- Department of Physical Chemistry and Material Science, University of Szeged, Rerrich Béla Square 1, 6720 Szeged, Hungary
| | - Ákos Kukovecz
- Department of Applied and Environmental Chemistry, University of Szeged, Rerrich Béla Square 1, 6720 Szeged, Hungary (Z.K.)
| | - Zoltán Kónya
- Department of Applied and Environmental Chemistry, University of Szeged, Rerrich Béla Square 1, 6720 Szeged, Hungary (Z.K.)
| | - Pál Sipos
- Department of Molecular and Analytical Chemistry, University of Szeged, Dóm Square 7-8, 6720 Szeged, Hungary; (C.B.); (M.K.)
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Ádám AA, Ziegenheim S, Janovák L, Szabados M, Bús C, Kukovecz Á, Kónya Z, Dékány I, Sipos P, Kutus B. Binding of Ca 2+ Ions to Alkylbenzene Sulfonates: Micelle Formation, Second Critical Concentration and Precipitation. Materials (Basel) 2023; 16:ma16020494. [PMID: 36676235 PMCID: PMC9864979 DOI: 10.3390/ma16020494] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Revised: 12/20/2022] [Accepted: 12/30/2022] [Indexed: 01/06/2023]
Abstract
Anionic surfactants, such as sodium linear alkylbenzene sulfonates (NaLAS), are utilized in various fields, including industry, household, and agriculture. The efficiency of their use in aqueous environments is significantly affected by the presence of cations, Ca2+ and Mg2+ in particular, as they can decrease the concentration of the surfactant due to precipitation. To understand cation-sulfonate interactions better, we study both NaLAS colloidal solutions in the presence of CaCl2 and precipitates forming at higher salt concentrations. Upon addition of CaCl2, we find the surface tension and critical micelle concentration of NaLAS to decrease significantly, in line with earlier findings for alkylbenzylsulfonates in the presence of divalent cations. Strikingly, an increase in the surface tension is discernible above 0.6 g L-1 NaLAS, accompanied by the decrease of apparent micelle sizes, which in turn gives rise to transparent systems. Thus, there appears to be a second critical concentration indicating another micellar equilibrium. Furthermore, the maximum salt tolerance of the surfactant is 0.1 g L-1 Ca2+, above which rapid precipitation occurs yielding sparingly soluble CaLAS2∙2H2O.
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Affiliation(s)
- Adél Anna Ádám
- Department of Organic Chemistry, University of Szeged, H-6720 Szeged, Hungary
| | | | - László Janovák
- Department of Physical Chemistry and Materials Science, University of Szeged, H-6720 Szeged, Hungary
| | - Márton Szabados
- Department of Organic Chemistry, University of Szeged, H-6720 Szeged, Hungary
| | - Csaba Bús
- Department of Organic Chemistry, University of Szeged, H-6720 Szeged, Hungary
| | - Ákos Kukovecz
- Department of Applied and Environmental Chemistry, University of Szeged, H-6720 Szeged, Hungary
| | - Zoltán Kónya
- Department of Applied and Environmental Chemistry, University of Szeged, H-6720 Szeged, Hungary
| | - Imre Dékány
- Department of Physical Chemistry and Materials Science, University of Szeged, H-6720 Szeged, Hungary
| | - Pál Sipos
- Department of Inorganic and Analytical Chemistry, University of Szeged, H-6720 Szeged, Hungary
- Correspondence: (P.S.); (B.K.)
| | - Bence Kutus
- Department of Inorganic and Analytical Chemistry, University of Szeged, H-6720 Szeged, Hungary
- Correspondence: (P.S.); (B.K.)
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Sipos P, Tarczay G, Fausto R. Prof. István Pálinkó (1959–2021) – The University Citizen. J Mol Struct 2023. [DOI: 10.1016/j.molstruc.2022.134190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Szabó Y, Kiss MA, Kónya Z, Kukovecz Á, Pálinkó I, Sipos P, Frank É, Szabados M. Microwave-induced base-catalyzed synthesis of methyl levulinate, a further improvement in dimethyl carbonate-mediated valorization of levulinic acid. Applied Catalysis A: General 2023. [DOI: 10.1016/j.apcata.2022.119020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Kocsis M, Szabados M, Ötvös SB, Samu GF, Fogarassy Z, Pécz B, Kukovecz Á, Kónya Z, Sipos P, Pálinkó I, Varga G. Selective production of imines and benzimidazoles by cooperative bismuth(III)/transition metal ion catalysis. J Catal 2022. [DOI: 10.1016/j.jcat.2022.09.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Böszörményi É, Dömötör O, Kutus B, Varga G, Peintler G, Sipos P. Coordination motifs of binary neodymium(III) D-gluconate, D-galactonate and L-gulonate complexes and the transition from inner- to outer-sphere coordination in neutral to strongly alkaline medium. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.132894] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Szabó V, Mészáros R, Kónya Z, Kukovecz Á, Pálinkó I, Sipos P, Szabados M. Preparation and characterization of MnIn-layered double hydroxides (LDHs), extension of the synthesis to fabricate MnM(III)-LDHs (M = Al, Sc, Cr, Fe, Ga), and the comparison of their photocatalytic and catalytic activities in the oxidation of hydroquinone. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.132966] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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Musza K, Mészáros R, Baán K, Kónya Z, Kukovecz Á, Pálinkó I, Sipos P, Szabados M. Mechanochemical preparation of NiCuSn nanoparticles and composites in presence of cetyltrimethylammonium bromide (CTAB) and the catalytic application of the products in homocoupling and hydration of terminal alkynes. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.132948] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Ziegenheim S, Sztegura A, Szabados M, Kónya Z, Kukovecz Á, Pálinkó I, Sipos P. EDTA analogues – unconventional inhibitors of gypsum precipitation. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.132491] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Abdelghafour MM, Orbán Á, Deák Á, Lamch Ł, Frank É, Nagy R, Ziegenheim S, Sipos P, Farkas E, Bari F, Janovák L. Biocompatible poly(ethylene succinate) polyester with molecular weight dependent drug release properties. Int J Pharm 2022; 618:121653. [PMID: 35278604 DOI: 10.1016/j.ijpharm.2022.121653] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Revised: 02/04/2022] [Accepted: 03/07/2022] [Indexed: 01/05/2023]
Abstract
In the present study, we demonstrate that well-known molecular weight-dependent solubility properties of a polymer can also be used in the field of controlled drug delivery. To prove this, poly(ethylene succinate) (PES) polyesters with polycondensation time regulated molecular weights were synthesized via catalyst-free direct polymerization in an equimolar ratio of ethylene glycol and succinic acid monomers at 185 °C. DSC and contact angle measurements revealed that increasing the molecular weight (Mw, 4.3-5.05 kDa) through the polymerization time (40-80 min) increased the thermal stability (Tm= ∼61-80 °C) and slightly the hydrophobicity (Θw= ∼27-41°) of the obtained aliphatic polyester. Next, this biodegradable polymer was used for the encapsulation of Ca2+ channel blocker Nimodipine (NIMO) to overcome the poor water solubility and enhance the bioavailability of the drug. The drug/ polymer compatibility was proved by the means of solubility (δ) and Flory-Huggins interaction (miscibility) parameters (χ). The nanoprecipitation encapsulation of NIMO into PES with increasing Mw resulted in the formation of spherical 270 ± 103 nm NIMO-loaded PES nanoparticles (NPs). Furthermore, based on the XRD measurements, the encapsulated form of NIMO-loaded PES NPs showed lower drug crystallinity, which enhanced not only the water solubility but even the water stability of the NIMO in an aqueous medium. The in-vitro drug release experiments demonstrated that the release of NIMO drug could be accelerated or even prolonged by the molecular weights of PES as well. Due to the low crystallinity of PES polyester and low particle size of the encapsulated NIMO drug led to enhance solubility and releasing process of NIMO from PES with lower Mw (4.3 kDa and 4.5 kDa) compared to pure crystalline NIMO. However, further increasing the molecular weight (5.05 kDa) was already reduced the amount of drug release that provides the prolonged therapeutic effect and enhances the bioavailability of the NIMO drug.
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Affiliation(s)
- Mohamed M Abdelghafour
- Department of Physical Chemistry and Materials Science, University of Szeged, H-6720, Rerrich Béla tér 1, Szeged, Hungary; Department of Chemistry, Faculty of Science, Zagazig University, Zagazig 44519, Egypt
| | - Ágoston Orbán
- Department of Physical Chemistry and Materials Science, University of Szeged, H-6720, Rerrich Béla tér 1, Szeged, Hungary
| | - Ágota Deák
- Department of Physical Chemistry and Materials Science, University of Szeged, H-6720, Rerrich Béla tér 1, Szeged, Hungary
| | - Łukasz Lamch
- Department of Organic and Pharmaceutical Technology, Faculty of Chemistry, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland
| | - Éva Frank
- Department of Organic Chemistry, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary
| | - Roland Nagy
- Department of MOL Department of Hydrocarbon and Coal Processing, Faculty of Engineering, University of Pannonia, Egyetem Str. 10, H-8200 Veszprém, Hungary
| | - Szilveszter Ziegenheim
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, H-6720 Szeged, Hungary
| | - Pál Sipos
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, H-6720 Szeged, Hungary
| | - Eszter Farkas
- Department of Medical Physics and Informatics, Faculty of Medicine & Faculty of Science and Informatics, University of Szeged, Korányi Fasor 9, H-6720 Szeged, Hungary; HCEMM-USZ Cerebral Blood Flow and Metabolism Research Group, University of Szeged, Dugonics Square 13, H-6720 Szeged, Hungary; Department of Cell Biology and Molecular Medicine, Faculty of Science and Informatics & Faculty of Medicine, University of Szeged, Somogyi Str. 4, H-6720 Szeged, Hungary
| | - Ferenc Bari
- Department of Medical Physics and Informatics, Faculty of Medicine & Faculty of Science and Informatics, University of Szeged, Korányi Fasor 9, H-6720 Szeged, Hungary
| | - László Janovák
- Department of Physical Chemistry and Materials Science, University of Szeged, H-6720, Rerrich Béla tér 1, Szeged, Hungary.
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Muráth S, Varga T, Kukovecz Á, Kónya Z, Sipos P, Pálinkó I, Varga G. Morphological aspects determine the catalytic activity of porous hydrocalumites: the role of the sacrificial templates. Materials Today Chemistry 2022. [DOI: 10.1016/j.mtchem.2021.100682] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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12
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Kocsis M, Ötvös SB, Samu GF, Fogarassy Z, Pécz B, Kukovecz Á, Kónya Z, Sipos P, Pálinkó I, Varga G. Copper-Loaded Layered Bismuth Subcarbonate-Efficient Multifunctional Heterogeneous Catalyst for Concerted C-S/C-N Heterocyclization. ACS Appl Mater Interfaces 2021; 13:42650-42661. [PMID: 34477369 PMCID: PMC8447192 DOI: 10.1021/acsami.1c09234] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
![]()
An efficient self-supported
Cu(II)Bi(III) bimetallic catalyst with
a layered structure was designed and developed. By careful characterization
of the as-prepared material, the host structure was identified to
exhibit a Sillen-type bismutite framework, with copper(II) ions being
loaded as guests. The heterogeneous catalyst enabled C–N and
C–S arylations under mild reaction conditions and with high
chemoselectivities, thus furnishing valuable phenothiazines via heterocyclization with wide substrate tolerance. As
corroborated by detailed catalytic studies, the cooperative, bifunctional
catalyst, bearing Lewis acid sites along with copper(II) catalytic
sites, facilitated an intriguing concerted C–N/C–S heterocyclization
mechanism. The heterogeneous nature of the catalytic reactions was
verified experimentally. Importantly, the catalyst was successfully
recycled and reused multiple times, persevering its original structural
order as well as its initial activity.
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Affiliation(s)
- Marianna Kocsis
- Department of Organic Chemistry, University of Szeged, Dóm tér 8, Szeged H-6720, Hungary.,Materials and Solution Structure Research Group, and Interdisciplinary Excellence Centre, Institute of Chemistry, University of Szeged, Aradi Vértanúk tere 1, Szeged H-6720, Hungary
| | - Sándor B Ötvös
- Institute of Chemistry, University of Graz, NAWI Graz, Heinrichstrasse 28, Graz A-8010, Austria
| | - Gergely F Samu
- Department of Physical Chemistry and Materials Science, Interdisciplinary Excellence Centre, University of Szeged, Szeged H-6720, Hungary
| | - Zsolt Fogarassy
- Centre for Energy Research, Institute of Technical Physics and Materials Science, Konkoly, Thege M. út 29-33., Budapest 1121, Hungary
| | - Béla Pécz
- Centre for Energy Research, Institute of Technical Physics and Materials Science, Konkoly, Thege M. út 29-33., Budapest 1121, Hungary
| | - Ákos Kukovecz
- Department of Applied and Environmental Chemistry, University of Szeged, Rerrich Béla tér 1, Szeged H-6720, Hungary
| | - Zoltán Kónya
- Department of Applied and Environmental Chemistry, University of Szeged, Rerrich Béla tér 1, Szeged H-6720, Hungary.,MTA-SZTE Reaction Kinetics and Surface Chemistry Research Group, Rerrich Béla tér 1, Szeged H-6720, Hungary
| | - Pál Sipos
- Materials and Solution Structure Research Group, and Interdisciplinary Excellence Centre, Institute of Chemistry, University of Szeged, Aradi Vértanúk tere 1, Szeged H-6720, Hungary.,Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, Szeged H-6720, Hungary
| | - István Pálinkó
- Department of Organic Chemistry, University of Szeged, Dóm tér 8, Szeged H-6720, Hungary.,Materials and Solution Structure Research Group, and Interdisciplinary Excellence Centre, Institute of Chemistry, University of Szeged, Aradi Vértanúk tere 1, Szeged H-6720, Hungary
| | - Gábor Varga
- Materials and Solution Structure Research Group, and Interdisciplinary Excellence Centre, Institute of Chemistry, University of Szeged, Aradi Vértanúk tere 1, Szeged H-6720, Hungary.,Department of Physical Chemistry and Materials Science, University of Szeged, Rerrich Béla tér 1, Szeged H-6720, Hungary
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13
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Szabados M, Ádám AA, Kása Z, Baán K, Mucsi R, Sápi A, Kónya Z, Kukovecz Á, Sipos P. M(II)Al 4 Type Layered Double Hydroxides-Preparation Using Mechanochemical Route, Structural Characterization and Catalytic Application. Materials (Basel) 2021; 14:ma14174880. [PMID: 34500969 PMCID: PMC8432663 DOI: 10.3390/ma14174880] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Revised: 08/24/2021] [Accepted: 08/25/2021] [Indexed: 12/02/2022]
Abstract
The synthesis of the copper-poor and aluminum-rich layered double hydroxides (LDHs) of the CuAl4 type was optimized in detail in this work, by applying an intense mechanochemical treatment to activate the gibbsite starting reagent. The phase-pure forms of these LDHs were prepared for the first time; using copper nitrate and perchlorate salts during the syntheses turned out to be the key to avoiding the formation of copper hydroxide sideproducts. Based on the use of the optimized syntheses parameters, the preparation of layered triple and multiple hydroxides was also attempted using Ni(II), Co(II), Zn(II) and even Mg(II) ions. These studies let us identify the relative positions of the incorporating cations in the well-known selectivity series as Ni2+ >> Cu2+ >> Zn2+ > Co2+ >> Mg2+. The solids formed were characterized by using powder X-ray diffractometry, UV–Vis diffuse reflectance spectroscopy, Fourier-transform infrared spectroscopy, thermogravimetric analysis and scanning electron microscopy. The catalytic potential of the samples was investigated in carbon monoxide oxidation reactions at atmospheric pressure, supported by an in situ diffuse reflectance infrared spectroscopy probe. All solids proved to be active and the combination of the nickel and cobalt incorporation (which resulted in a NiCoAl8 layered triple hydroxide) brought outstanding benefits regarding low-temperature oxidation and increased carbon monoxide conversion values.
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Affiliation(s)
- Márton Szabados
- Department of Organic Chemistry, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary;
- Material and Solution Structure Research Group, Institute of Chemistry, University of Szeged, Aradi Vértanúk tere 1, H-6720 Szeged, Hungary; (A.A.Á.); (Z.K.)
| | - Adél Anna Ádám
- Material and Solution Structure Research Group, Institute of Chemistry, University of Szeged, Aradi Vértanúk tere 1, H-6720 Szeged, Hungary; (A.A.Á.); (Z.K.)
| | - Zsolt Kása
- Material and Solution Structure Research Group, Institute of Chemistry, University of Szeged, Aradi Vértanúk tere 1, H-6720 Szeged, Hungary; (A.A.Á.); (Z.K.)
| | - Kornélia Baán
- Department of Applied and Environmental Chemistry, University of Szeged, Rerrich B. tér 1, H-6720 Szeged, Hungary; (K.B.); (R.M.); (A.S.); (Z.K.); (Á.K.)
| | - Róbert Mucsi
- Department of Applied and Environmental Chemistry, University of Szeged, Rerrich B. tér 1, H-6720 Szeged, Hungary; (K.B.); (R.M.); (A.S.); (Z.K.); (Á.K.)
| | - András Sápi
- Department of Applied and Environmental Chemistry, University of Szeged, Rerrich B. tér 1, H-6720 Szeged, Hungary; (K.B.); (R.M.); (A.S.); (Z.K.); (Á.K.)
| | - Zoltán Kónya
- Department of Applied and Environmental Chemistry, University of Szeged, Rerrich B. tér 1, H-6720 Szeged, Hungary; (K.B.); (R.M.); (A.S.); (Z.K.); (Á.K.)
- MTA-SZTE Reaction Kinetics and Surface Chemistry Research Group, Rerrich B tér 1, H-6720 Szeged, Hungary
| | - Ákos Kukovecz
- Department of Applied and Environmental Chemistry, University of Szeged, Rerrich B. tér 1, H-6720 Szeged, Hungary; (K.B.); (R.M.); (A.S.); (Z.K.); (Á.K.)
| | - Pál Sipos
- Material and Solution Structure Research Group, Institute of Chemistry, University of Szeged, Aradi Vértanúk tere 1, H-6720 Szeged, Hungary; (A.A.Á.); (Z.K.)
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, H-6720 Szeged, Hungary
- Correspondence:
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14
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Abdelghafour MM, Orbán Á, Deák Á, Lamch Ł, Frank É, Nagy R, Ádám A, Sipos P, Farkas E, Bari F, Janovák L. The Effect of Molecular Weight on the Solubility Properties of Biocompatible Poly(ethylene succinate) Polyester. Polymers (Basel) 2021; 13:2725. [PMID: 34451264 PMCID: PMC8398594 DOI: 10.3390/polym13162725] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Revised: 08/04/2021] [Accepted: 08/11/2021] [Indexed: 01/08/2023] Open
Abstract
Poly(ethylene succinate) (PES) is one of the most promising biodegradable and biocompatible polyesters and is widely used in different biomedical applications. However, little information is available on its solubility and precipitation properties, despite that these solution behavior properties affect its applicability. In order to systematically study these effects, biodegradable and biocompatible poly(ethylene succinate) (PES) was synthesized using ethylene glycol and succinic acid monomers with an equimolar ratio. Despite the optimized reaction temperature (T = 185 °C) of the direct condensation polymerization, relatively low molecular mass values were achieved without using a catalyst, and the Mn was adjustable with the reaction time (40-100 min) in the range of ~850 and ~1300 Da. The obtained crude products were purified by precipitation from THF ("good" solvent) with excess of methanol ("bad" solvent). The solvents for PES oligomers purification were chosen according to the calculated values of solubility parameters by different approaches (Fedors, Hoy and Hoftyzer-van Krevelen). The theta-solvent composition of the PES solution was 0.3 v/v% water and 0.7 v/v% DMSO in this binary mixture. These measurements were also allowed to determine important parameters such as the coefficients A (=0.67) and B (=3.69 × 104) from the Schulz equation, or the Kη (=8.22 × 10-2) and α (=0.52) constants from the Kuhn-Mark-Houwink equation. Hopefully, the prepared PES with different molecular weights is a promising candidate for biomedical applications and the reported data and constants are useful for other researchers who work with this promising polyester.
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Affiliation(s)
- Mohamed M. Abdelghafour
- Department of Physical Chemistry and Materials Science, University of Szeged, Rerrich Béla tér 1, H-6720 Szeged, Hungary; (M.M.A.); (Á.O.); (Á.D.)
- Department of Chemistry, Faculty of Science, Zagazig University, Zagazig 44519, Egypt
| | - Ágoston Orbán
- Department of Physical Chemistry and Materials Science, University of Szeged, Rerrich Béla tér 1, H-6720 Szeged, Hungary; (M.M.A.); (Á.O.); (Á.D.)
| | - Ágota Deák
- Department of Physical Chemistry and Materials Science, University of Szeged, Rerrich Béla tér 1, H-6720 Szeged, Hungary; (M.M.A.); (Á.O.); (Á.D.)
| | - Łukasz Lamch
- Department of Organic and Pharmaceutical Technology, Faculty of Chemistry, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland;
| | - Éva Frank
- Department of Organic Chemistry, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary;
| | - Roland Nagy
- Department of MOL Department of Hydrocarbon and Coal Processing, Faculty of Engineering, University of Pannonia, Egyetem Str. 10, H-8200 Veszprém, Hungary;
| | - Adél Ádám
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, H-6720 Szeged, Hungary; (A.Á.); (P.S.)
| | - Pál Sipos
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, H-6720 Szeged, Hungary; (A.Á.); (P.S.)
| | - Eszter Farkas
- HCEMM-USZ Cerebral Blood Flow and Metabolism Research Group, University of Szeged, Dugonics Square 13, H-6720 Szeged, Hungary;
- Department of Cell Biology and Molecular Medicine, Faculty of Science and Informatics & Faculty of Medicine, University of Szeged, Somogyi Str. 4, H-6720 Szeged, Hungary
- Department of Medical Physics and Informatics, Faculty of Medicine & Faculty of Science and Informatics, University of Szeged, Korányi Fasor 9, H-6720 Szeged, Hungary;
| | - Ferenc Bari
- Department of Medical Physics and Informatics, Faculty of Medicine & Faculty of Science and Informatics, University of Szeged, Korányi Fasor 9, H-6720 Szeged, Hungary;
| | - László Janovák
- Department of Physical Chemistry and Materials Science, University of Szeged, Rerrich Béla tér 1, H-6720 Szeged, Hungary; (M.M.A.); (Á.O.); (Á.D.)
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Musza K, Szabados M, Ádám AA, Kónya Z, Kukovecz Á, Sipos P, Pálinkó I. Ball Milling of Copper Powder Under Dry and Surfactant-Assisted Conditions-On the Way Towards Cu/Cu₂O Nanocatalyst. J Nanosci Nanotechnol 2021; 19:389-394. [PMID: 30327046 DOI: 10.1166/jnn.2019.15784] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Samples of copper powder was milled with varied grinding frequencies in the presence of various organic agents (oleylamine, ethylene glycol or dimethyl sulfoxide) or without additives. The effects of experimental conditions were investigated by X-ray diffractometry, scanning electron microscopy and dynamic light scattering measurements. The aggregation of particles were supressed by added organics. The catalytic activities of the variously treated samples were measured in the Ullmanntype reaction of iodobenzene and 1H-pyrazole.
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Affiliation(s)
- Katalin Musza
- Department of Organic Chemistry, University of Szeged, Szeged, H-6720, Hungary
| | - Márton Szabados
- Department of Organic Chemistry, University of Szeged, Szeged, H-6720, Hungary
| | - Adél Anna Ádám
- Department of Organic Chemistry, University of Szeged, Szeged, H-6720, Hungary
| | - Zoltán Kónya
- Department of Applied and Environmental Chemistry, University of Szeged, Szeged, H-6720, Hungary
| | - Ákos Kukovecz
- Department of Applied and Environmental Chemistry, University of Szeged, Szeged, H-6720, Hungary
| | - Pál Sipos
- Material and Solution Structure Research Group, University of Szeged, Szeged, H-6720, Hungary
| | - István Pálinkó
- Department of Organic Chemistry, University of Szeged, Szeged, H-6720, Hungary
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16
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Szabados M, Adél Ádám A, Traj P, Muráth S, Baán K, Bélteky P, Kónya Z, Kukovecz Á, Sipos P, Pálinkó I. Mechanochemical and wet chemical syntheses of CaIn-layered double hydroxide and its performance in a transesterification reaction compared to those of other Ca2M(III) hydrocalumites (M: Al, Sc, V, Cr, Fe, Ga) and Mg(II)-, Ni(II)-, Co(II)- or Zn(II)-based hydrotalcites. J Catal 2020. [DOI: 10.1016/j.jcat.2020.07.038] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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17
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Timár Z, Varga G, Szabados M, Csankó K, Alapi T, Forano C, Prevot V, Sipos P, Pálinkó I. Structural insight into the photoinduced E→Z isomerisation of cinnamate embedded in ZnAl and MgAl layered double hydroxides. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2020.128561] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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18
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Kutus B, Dudás C, Friesen S, Peintler G, Pálinkó I, Sipos P, Buchner R. Equilibria and Dynamics of Sodium Citrate Aqueous Solutions: The Hydration of Citrate and Formation of the Na 3Cit 0 Ion Aggregate. J Phys Chem B 2020; 124:9604-9614. [PMID: 33070612 DOI: 10.1021/acs.jpcb.0c06377] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Sodium citrate (Na3Cit) has a crucial role in many biological and industrial processes. Yet, quantitative information on its hydration and the ion association between Na+ and Cit3- ions in a broad range of salt concentrations is still lacking. In this work, we study both ion association equilibria and relaxation dynamics of sodium citrate solutions by combining potentiometry, spectrophotometry, and dielectric spectroscopy. From photometric and potentiometric measurements, we detect the formation of the NaCit2- ion-pair and the neutral Na3Cit0 ion aggregate in a wide range of ionic strengths (0.5-4 M). Due to its remarkable stability, the latter becomes the prevailing species at higher salt concentrations. In the dielectric spectra, we observe the dipolar relaxation of Cit3- and NaCit2- and two solvent-related processes, associated with the collective rearrangement of the H-bond network (cooperative water mode) and the H-bond flip of water molecules (fast water mode). Unlike numerous other salt solutions, the relaxation time of the cooperative mode scales with the viscosity indicating that the strongly hydrated anion fits well into the water network. That is, the stabilizing effect of anion-solvent interactions on the H-bond network outweighs the destructive impact of the cations as the latter are only present at low concentration, due to strong ion association. In conclusion, the affinity of citrate toward Na+ binding not only governs solution equilibria but also has a strong impact on water dynamics.
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Affiliation(s)
- Bence Kutus
- Department of Molecular Spectroscopy, Max Planck Institute for Polymer Research, D-55128 Mainz, Germany.,Material and Solution Structure Research Group, Institute of Chemistry, University of Szeged, H-6720 Szeged, Hungary
| | - Csilla Dudás
- Material and Solution Structure Research Group, Institute of Chemistry, University of Szeged, H-6720 Szeged, Hungary
| | - Sergej Friesen
- Institute of Physical and Theoretical Chemistry, University of Regensburg, D-93053 Regensburg, Germany
| | - Gábor Peintler
- Material and Solution Structure Research Group, Institute of Chemistry, University of Szeged, H-6720 Szeged, Hungary
| | - István Pálinkó
- Material and Solution Structure Research Group, Institute of Chemistry, University of Szeged, H-6720 Szeged, Hungary
| | - Pál Sipos
- Material and Solution Structure Research Group, Institute of Chemistry, University of Szeged, H-6720 Szeged, Hungary
| | - Richard Buchner
- Institute of Physical and Theoretical Chemistry, University of Regensburg, D-93053 Regensburg, Germany
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Buckó Á, Kása Z, Szabados M, Kutus B, Berkesi O, Kónya Z, Kukovecz Á, Sipos P, Pálinkó I. The Structure and Thermal Properties of Solid Ternary Compounds Forming with Ca 2+, Al 3+ and Heptagluconate Ions. Molecules 2020; 25:E4715. [PMID: 33066653 PMCID: PMC7587368 DOI: 10.3390/molecules25204715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2020] [Revised: 10/09/2020] [Accepted: 10/14/2020] [Indexed: 11/28/2022] Open
Abstract
In the present work, the structure and thermal stability of Ca-Al mixed-metal compounds, relevant in the Bayer process as intermediates, have been investigated. X-ray diffraction (XRD) measurements revealed the amorphous morphology of the compounds, which was corroborated by SEM-EDX measurements. The results of ICP-OES and UV-Vis experiments suggested the formation of three possible ternary calcium aluminum heptagluconate (Ca-Al-Hpgl) compounds, with the formulae of CaAlHpgl(OH)40, Ca2AlHpgl2(OH)50 and Ca3Al2Hpgl3(OH)90. Additional IR and Raman experiments revealed the centrally symmetric arrangement of heptagluconate around the metal ion. The increased thermal stability was demonstrated by thermal analysis of the solids and confirmed our findings.
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Affiliation(s)
- Ákos Buckó
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm sqr. 7, H-6720 Szeged, Hungary; (Á.B.); (Z.K.); (P.S.)
| | - Zsolt Kása
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm sqr. 7, H-6720 Szeged, Hungary; (Á.B.); (Z.K.); (P.S.)
| | - Márton Szabados
- Department of Organic Chemistry, University of Szeged, Dóm sqr. 8, H-6720 Szeged, Hungary;
| | - Bence Kutus
- Department of Molecular Spectroscopy, Max Planck Institute for Polymer Research, D-55128 Mainz, Germany;
| | - Ottó Berkesi
- Department of Physical Chemistry and Materials Science, University of Szeged, Rerrich B. sqr. 1, H-6720 Szeged, Hungary;
| | - Zoltán Kónya
- Department of Applied and Environmental Chemistry, University of Szeged, Rerrich B. sqr. 1, H-6720 Szeged, Hungary; (Z.K.); (Á.K.)
| | - Ákos Kukovecz
- Department of Applied and Environmental Chemistry, University of Szeged, Rerrich B. sqr. 1, H-6720 Szeged, Hungary; (Z.K.); (Á.K.)
| | - Pál Sipos
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm sqr. 7, H-6720 Szeged, Hungary; (Á.B.); (Z.K.); (P.S.)
| | - István Pálinkó
- Department of Organic Chemistry, University of Szeged, Dóm sqr. 8, H-6720 Szeged, Hungary;
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Ziegenheim S, Peintler G, Pálinkó I, Sipos P. The kinetics of the precipitation of gypsum, CaSO4·2H2O, over a wide range of reactant concentrations. Reac Kinet Mech Cat 2020. [DOI: 10.1007/s11144-020-01838-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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21
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Buckó Á, Kutus B, Peintler G, Kele Z, Pálinkó I, Sipos P. Stability and structural aspects of complexes forming between aluminum(III) and D-heptagluconate in acidic to strongly alkaline media: An unexpected diversity. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.113645] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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22
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Ádám AA, Szabados M, Varga G, Papp Á, Musza K, Kónya Z, Kukovecz Á, Sipos P, Pálinkó I. Ultrasound-Assisted Hydrazine Reduction Method for the Preparation of Nickel Nanoparticles, Physicochemical Characterization and Catalytic Application in Suzuki-Miyaura Cross-Coupling Reaction. Nanomaterials (Basel) 2020; 10:nano10040632. [PMID: 32231111 PMCID: PMC7221950 DOI: 10.3390/nano10040632] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/08/2020] [Revised: 03/25/2020] [Accepted: 03/26/2020] [Indexed: 02/06/2023]
Abstract
In the experimental work leading to this contribution, the parameters of the ultrasound treatment (temperature, output power, emission periodicity) were varied to learn about the effects of the sonication on the crystallization of Ni nanoparticles during the hydrazine reduction technique. The solids were studied in detail by X-ray diffractometry, dynamic light scattering, thermogravimetry, specific surface area, pore size analysis, temperature-programmed CO2/NH3 desorption and scanning electron microscopy. It was found that the thermal behaviour, specific surface area, total pore volume and the acid-base character of the solids were mainly determined by the amount of the nickel hydroxide residues. The highest total acidity was recorded over the solid under low-power (30 W) continuous ultrasonic treatment. The catalytic behaviour of the nanoparticles was tested in a Suzuki-Miyaura cross-coupling reaction over five samples prepared in the conventional as well as the ultrasonic ways. The ultrasonically prepared catalysts usually performed better, and the highest catalytic activity was measured over the nanoparticles prepared under low-power (30 W) continuous sonication.
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Affiliation(s)
- Adél Anna Ádám
- Department of Organic Chemistry, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary; (A.A.Á.); (M.S.); (G.V.); (K.M.)
- Material and Solution Structure Research Group, and Interdisciplinary Excellence Centre, Institute of Chemistry, University of Szeged, Aradi Vértanúk tere 1, H-6720 Szeged, Hungary; (Á.P.); (P.S.)
| | - Márton Szabados
- Department of Organic Chemistry, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary; (A.A.Á.); (M.S.); (G.V.); (K.M.)
- Material and Solution Structure Research Group, and Interdisciplinary Excellence Centre, Institute of Chemistry, University of Szeged, Aradi Vértanúk tere 1, H-6720 Szeged, Hungary; (Á.P.); (P.S.)
| | - Gábor Varga
- Department of Organic Chemistry, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary; (A.A.Á.); (M.S.); (G.V.); (K.M.)
- Material and Solution Structure Research Group, and Interdisciplinary Excellence Centre, Institute of Chemistry, University of Szeged, Aradi Vértanúk tere 1, H-6720 Szeged, Hungary; (Á.P.); (P.S.)
| | - Ádám Papp
- Material and Solution Structure Research Group, and Interdisciplinary Excellence Centre, Institute of Chemistry, University of Szeged, Aradi Vértanúk tere 1, H-6720 Szeged, Hungary; (Á.P.); (P.S.)
| | - Katalin Musza
- Department of Organic Chemistry, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary; (A.A.Á.); (M.S.); (G.V.); (K.M.)
- Material and Solution Structure Research Group, and Interdisciplinary Excellence Centre, Institute of Chemistry, University of Szeged, Aradi Vértanúk tere 1, H-6720 Szeged, Hungary; (Á.P.); (P.S.)
| | - Zoltán Kónya
- Department of Applied and Environmental Chemistry, University of Szeged, Rerrich B. tér 1, H-6720 Szeged, Hungary; (Z.K.); (Á.K.)
- MTA-SZTE Reaction Kinetics and Surface Chemistry Research Group, Rerrich B tér 1, H-6720 Szeged, Hungary
| | - Ákos Kukovecz
- Department of Applied and Environmental Chemistry, University of Szeged, Rerrich B. tér 1, H-6720 Szeged, Hungary; (Z.K.); (Á.K.)
| | - Pál Sipos
- Material and Solution Structure Research Group, and Interdisciplinary Excellence Centre, Institute of Chemistry, University of Szeged, Aradi Vértanúk tere 1, H-6720 Szeged, Hungary; (Á.P.); (P.S.)
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, H-6720 Szeged, Hungary
| | - István Pálinkó
- Department of Organic Chemistry, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary; (A.A.Á.); (M.S.); (G.V.); (K.M.)
- Material and Solution Structure Research Group, and Interdisciplinary Excellence Centre, Institute of Chemistry, University of Szeged, Aradi Vértanúk tere 1, H-6720 Szeged, Hungary; (Á.P.); (P.S.)
- Correspondence:
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23
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Böszörményi É, Lado J, Dudás C, Kutus B, Szabados M, Varga G, Pálinkó I, Sipos P. The structure and composition of solid complexes comprising of Nd(III), Ca(II) and D-gluconate isolated from solutions relevant to radioactive waste disposal. PURE APPL CHEM 2020. [DOI: 10.1515/pac-2019-1010] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Certain complexing agents (such as D-gluconate, D-isosaccharinate, etc.) as well as actinides and lanthanides are simultaneously present in cementitious radioactive waste repositories and (in the presence of water) are capable of forming complex compounds. Such processes may immobilize radionuclides and are of importance in the thermodynamic modelling of the aqueous chemistry of waste repositories. Nd(III) is considered to be a suitable model for trivalent lanthanides and actinides, due to the similarity of their ionic radii. In the current work, solid complexes isolated from aqueous solution containing Nd(III), Ca(II) and D-gluconate (Gluc−) were investigated. In an aqueous solution containing Nd(III) and Gluc−, the formation of a precipitate was observed at pH ≥ 8. This precipitate was found to redissolve around pH ~ 11, but reprecipitated when Ca(II) ions were added to the solution. In order to gain an insight in binary and ternary aqueous systems, in the present work we report the structure of these solid complexes obtained from XRD, FT-IR, Raman, SEM-EDAX and UV-DRS measurements. The structure of these solids, where possible, was compared with those identified in solution. The compositions of these complexes are suggested to be NdGlucH−1(OH) · 2H2O and CaNdGlucH−1(OH)3 · 2H2O, respectively. In these, the chemical environment of the Nd(III) was found to be the same as that in the NdGlucH−1(OH)0(aq) solution species.
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Affiliation(s)
- Éva Böszörményi
- Department of Inorganic and Analytical Chemistry, Faculty of Science and Informatics , University of Szeged , Dóm tér 7 , Szeged H-6721 , Hungary
| | - Jorge Lado
- Department of Organic Chemistry, Faculty of Science and Informatics , University of Szeged , Dóm tér 8 , Szeged H-6721 , Hungary
| | - Csilla Dudás
- Department of Inorganic and Analytical Chemistry, Faculty of Science and Informatics , University of Szeged , Dóm tér 7 , Szeged H-6721 , Hungary
| | - Bence Kutus
- Department of Inorganic and Analytical Chemistry, Faculty of Science and Informatics , University of Szeged , Dóm tér 7 , Szeged H-6721 , Hungary
| | - Márton Szabados
- Department of Organic Chemistry, Faculty of Science and Informatics , University of Szeged , Dóm tér 8 , Szeged H-6721 , Hungary
| | - Gábor Varga
- Department of Organic Chemistry, Faculty of Science and Informatics , University of Szeged , Dóm tér 8 , Szeged H-6721 , Hungary
| | - István Pálinkó
- Department of Organic Chemistry, Faculty of Science and Informatics , University of Szeged , Dóm tér 8 , Szeged H-6721 , Hungary
| | - Pál Sipos
- Department of Inorganic and Analytical Chemistry, Faculty of Science and Informatics , University of Szeged , Dóm tér 7 , Szeged H-6721 , Hungary
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Varga G, Kukovecz Á, Kónya Z, Sipos P, Pálinkó I. Green and selective toluene oxidation–Knoevenagel-condensation domino reaction over Ce- and Bi-based CeBi mixed oxide mixtures. J Catal 2020. [DOI: 10.1016/j.jcat.2019.11.011] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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25
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Varga G, Szabados M, Kukovecz Á, Kónya Z, Varga T, Sipos P, Pálinkó I. Layered double alkoxides a novel group of layered double hydroxides without water content. Materials Research Letters 2019. [DOI: 10.1080/21663831.2019.1700199] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Gábor Varga
- Department of Organic Chemistry, University of Szeged, Szeged, Hungary
- Materials and Solution Structure Research Group and Interdisciplinary Excellence Centre, Institute of Chemistry, University of Szeged, Szeged, Hungary
| | - Márton Szabados
- Department of Organic Chemistry, University of Szeged, Szeged, Hungary
- Materials and Solution Structure Research Group and Interdisciplinary Excellence Centre, Institute of Chemistry, University of Szeged, Szeged, Hungary
| | - Ákos Kukovecz
- Department of Applied and Environmental Chemistry, University of Szeged, Szeged, Hungary
| | - Zoltán Kónya
- Department of Applied and Environmental Chemistry, University of Szeged, Szeged, Hungary
- MTA-SZTE Reaction Kinetics and Surface Chemistry Research Group, University of Szeged, Szeged, Hungary
| | - Tamás Varga
- Department of Applied and Environmental Chemistry, University of Szeged, Szeged, Hungary
| | - Pál Sipos
- Materials and Solution Structure Research Group and Interdisciplinary Excellence Centre, Institute of Chemistry, University of Szeged, Szeged, Hungary
- Department of Inorganic and Analytical Chemistry, University of Szeged, Szeged, Hungary
| | - István Pálinkó
- Department of Organic Chemistry, University of Szeged, Szeged, Hungary
- Materials and Solution Structure Research Group and Interdisciplinary Excellence Centre, Institute of Chemistry, University of Szeged, Szeged, Hungary
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Varga G, Karádi K, Kukovecz Á, Kónya Z, Sipos P, Pálinkó I. Placing Ni(II) Ions in Various Positions In/On Layered Double Hydroxides: Synthesis, Characterization and Testing in C–C Coupling Reactions. Catal Letters 2019. [DOI: 10.1007/s10562-019-02742-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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27
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Muráth S, Szabados M, Sebők D, Kukovecz Á, Kónya Z, Szilágyi I, Sipos P, Pálinkó I. Influencing the texture and morphological properties of layered double hydroxides with the most diluted solvent mixtures – The effect of 6–8 carbon alcohols and temperature. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2019.04.053] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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28
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Timár Z, Sztankovics D, Varga G, Sipos P, Pálinkó I. Esterification reactions with acetate- or benzoate-containing CaAl-layered double hydroxide samples. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2019.03.037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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29
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Bojtor C, Győri Z, Sipos P, Radócz L, Tóth B. Effect of bean rust [Uromyces appendiculatus (Pers.) Strauss] on photosynthetic characteristics, superoxide-dismutase activity, and lipid peroxidation of common bean (Phaseolus vulgaris L.). Acta Alimentaria 2019. [DOI: 10.1556/066.2019.48.2.13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- Cs. Bojtor
- Institute of Nutrition, University of Debrecen, H-4032 Debrecen, Egyetem tér 1. Hungary
| | - Z. Győri
- Institute of Nutrition, University of Debrecen, H-4032 Debrecen, Egyetem tér 1. Hungary
| | - P. Sipos
- Institute of Nutrition, University of Debrecen, H-4032 Debrecen, Egyetem tér 1. Hungary
| | - L. Radócz
- Institute of Plant Protection, Faculty of Agricultural and Food Sciences and Environmental Management, University of Debrecen, H-4032 Debrecen, Böszörményi út 138. Hungary
| | - B. Tóth
- Institute of Nutrition, University of Debrecen, H-4032 Debrecen, Egyetem tér 1. Hungary
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Kutus B, Dudás C, Orbán E, Lupan A, Attia AAA, Pálinkó I, Sipos P, Peintler G. Magnesium(II) d-Gluconate Complexes Relevant to Radioactive Waste Disposals: Metal-Ion-Induced Ligand Deprotonation or Ligand-Promoted Metal-Ion Hydrolysis? Inorg Chem 2019; 58:6832-6844. [PMID: 31066555 PMCID: PMC6750863 DOI: 10.1021/acs.inorgchem.9b00289] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Indexed: 11/28/2022]
Abstract
The complexation equilibria between Mg2+ and d-gluconate (Gluc-) ions are of particular importance in modeling the chemical speciation in low- and intermediate-level radioactive waste repositories. NMR measurements and potentiometric titrations conducted at 25 °C and 4 M ionic strength revealed the formation of the MgGluc+, MgGlucOH0, MgGluc(OH)2-, and Mg3Gluc2(OH)40 complexes. The trinuclear species provides indirect evidence for the existence of multinuclear magnesium(II) hydroxido complexes, whose formation was proposed earlier but has not been confirmed yet. Additionally, speciation calculations demonstrated that MgCl2 can markedly decrease the solubility of thorium(IV) at low ligand concentrations. Regarding the structure of MgGluc+, both IR spectra and density functional theory (DFT) calculations indicate the monodentate coordination of Gluc-. By the potentiometric data, the acidity of the water molecules is higher in the MgGluc+ and MgGlucOH0 species than in the Mg(H2O)62+ aqua ion. On the basis of DFT calculations, this ligand-promoted hydrolysis is caused by strong hydrogen bonds forming between Gluc- and Mg(H2O)62+. Conversely, metal-ion-induced ligand deprotonation takes place in the case of calcium(II) complexes, giving rise to salient variations on the NMR spectra in a strongly alkaline medium.
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Affiliation(s)
- Bence Kutus
- Department of Molecular Spectroscopy, Max
Planck Institute for Polymer Research, D-55128 Mainz, Germany
- Institute of Chemistry, University
of Szeged, H-6720 Szeged, Hungary
| | - Csilla Dudás
- Institute of Chemistry, University
of Szeged, H-6720 Szeged, Hungary
| | - Eszter Orbán
- Institute of Chemistry, University
of Szeged, H-6720 Szeged, Hungary
| | - Alexandru Lupan
- Department of Chemistry, Babeş-Bolyai
University, RO-400028 Cluj-Napoca, Romania
| | - Amr A. A. Attia
- Department of Chemistry, Babeş-Bolyai
University, RO-400028 Cluj-Napoca, Romania
| | - István Pálinkó
- Institute of Chemistry, University
of Szeged, H-6720 Szeged, Hungary
| | - Pál Sipos
- Institute of Chemistry, University
of Szeged, H-6720 Szeged, Hungary
| | - Gábor Peintler
- Institute of Chemistry, University
of Szeged, H-6720 Szeged, Hungary
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Musza K, Szabados M, Ádám AA, Kónya Z, Kukovecz Á, Sipos P, Pálinkó I. Mechanochemically modified hydrazine reduction method for the synthesis of nickel nanoparticles and their catalytic activities in the Suzuki–Miyaura cross-coupling reaction. Reac Kinet Mech Cat 2019. [DOI: 10.1007/s11144-018-1509-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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32
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Szabados M, Kónya Z, Kukovecz Á, Sipos P, Pálinkó I. Ultrasonically-assisted mechanochemical synthesis of zinc aluminate spinel from aluminium-rich layered double hydroxide. J SOLID STATE CHEM 2019. [DOI: 10.1016/j.jssc.2019.02.020] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Ádám AA, Szabados M, Musza K, Bélteky P, Kónya Z, Kukovecz Á, Sipos P, Pálinkó I. Effects of medium and nickel salt source in the synthesis and catalytic performance of nano-sized nickel in the Suzuki-Miyaura cross-coupling reaction. Reac Kinet Mech Cat 2019. [DOI: 10.1007/s11144-018-01526-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Varga G, Kónya Z, Kukovecz Á, Sipos P, Pálinkó I. Co(II)-amino acid–CaAl-layered double hydroxide composites – Construction and characterization. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2018.11.032] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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35
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Hung TN, Varga G, Kónya Z, Kukovecz Á, Kozma G, Havasi V, Sipos P, Mlostoń G, Pálinkó I. The aggregation behaviour of 2H-imidazole-2-thione derivatives in solution, the solid state and over polycrystalline gold surface. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2018.11.076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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36
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Szabados M, Ádám AA, Kónya Z, Kukovecz Á, Carlson S, Sipos P, Pálinkó I. Effects of ultrasonic irradiation on the synthesis, crystallization, thermal and dissolution behaviour of chloride-intercalated, co-precipitated CaFe-layered double hydroxide. Ultrason Sonochem 2019; 55:165-173. [PMID: 30853533 DOI: 10.1016/j.ultsonch.2019.02.024] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2018] [Revised: 01/26/2019] [Accepted: 02/25/2019] [Indexed: 02/08/2023]
Abstract
The output power (30-150 W) and the periodicity (20-100%) of ultrasound emission were varied in a wide range to regulate and improve the crystallization process in the commonly used co-precipitation technique of chloride-intercalated CaFe-layered double hydroxides. The influence of ultrasound irradiation on the as-prepared materials was studied by X-ray diffractometry, dynamic light scattering, UV-Vis-NIR diffuse reflectance spectroscopy, specific surface area measurement, pore size analysis, ion-selective electrode potentiometric investigations and thermogravimetry. Additionally, structural alterations due to heat treatment at various temperatures were followed in detail by Fourier-transform infrared and X-ray absorption spectroscopies as well as scanning electron microscopy. The ultrasonic treatment was capable of controlling the sizes of primarily formed (from 19 nm to 30 nm) as well as the aggregated (secondary) particles (between 450 nm and 700 nm), and thus modifying their textural parameters and enhancing the incorporation of chloride anions into the interlamellar space. For the first time, the optical energy gap of CaFe-LDH was reported here depending on the nature of applied stirring (4.18-4.34 eV). The heat-treatment investigations revealed that the layered structure was stabile until 200 °C, even at the atomic level.
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Affiliation(s)
- Márton Szabados
- Department of Organic Chemistry, University of Szeged, Dóm tér 8, Szeged H-6720, Hungary; Material and Solution Structure Research Group, Institute of Chemistry, University of Szeged, Aradi Vértanúk tere 1, Szeged H-6720, Hungary
| | - Adél Anna Ádám
- Department of Organic Chemistry, University of Szeged, Dóm tér 8, Szeged H-6720, Hungary; Material and Solution Structure Research Group, Institute of Chemistry, University of Szeged, Aradi Vértanúk tere 1, Szeged H-6720, Hungary
| | - Zoltán Kónya
- Department of Applied and Environmental Chemistry, University of Szeged, Rerrich B. tér 1, Szeged H-6720, Hungary; MTA-SZTE Reaction Kinetics and Surface Chemistry Research Group, Rerrich B tér 1, Szeged H-6720, Hungary
| | - Ákos Kukovecz
- Department of Applied and Environmental Chemistry, University of Szeged, Rerrich B. tér 1, Szeged H-6720, Hungary
| | - Stefan Carlson
- MAX-IV Laboratory, Ole Römers väg 1, Lund SE-223 63, Sweden
| | - Pál Sipos
- Material and Solution Structure Research Group, Institute of Chemistry, University of Szeged, Aradi Vértanúk tere 1, Szeged H-6720, Hungary; Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, Szeged H-6720, Hungary
| | - István Pálinkó
- Department of Organic Chemistry, University of Szeged, Dóm tér 8, Szeged H-6720, Hungary; Material and Solution Structure Research Group, Institute of Chemistry, University of Szeged, Aradi Vértanúk tere 1, Szeged H-6720, Hungary.
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Ádám AA, Szabados M, Polyákovics Á, Musza K, Kónya Z, Kukovecz Á, Sipos P, Pálinkó I. The Synthesis and Use of Nano Nickel Catalysts. J Nanosci Nanotechnol 2019; 19:453-458. [PMID: 30327055 DOI: 10.1166/jnn.2019.15781] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The hydrazine reduction method was applied for the synthesis of nickel nanoparticles without using inert atmosphere and added surface active agents. The effect of the preparation temperature and the chemical quality of the metal sources as well as the solvents were studied. The generation of nanoparticles were studied primarily by X-ray diffractometry, but scanning and transmission electron microscopies as well as dynamic light scattering measurements were also used for the better understanding of the nanoparticles behaviour. The elevation of temperature was the key point in transforming Ni(OH)₂ into metallic nickel. By selecting the metal source, the obtained crystallite sizes could be tailored between 7 nm and 15 nm; however, the SEM and DLS measurements revealed significant agglomeration resulting in aggregates with spherical or Ni(OH)2 resembling morphologies depending on the solvent used. The catalytic activities of the nanoparticles prepared were tested and compared in a Suzuki-Miyaura cross-coupling reaction.
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Affiliation(s)
- Adél Anna Ádám
- Department of Organic Chemistry, University of Szeged, Dóm tér 8, Szeged, H-6720, Hungary
| | - Márton Szabados
- Department of Organic Chemistry, University of Szeged, Dóm tér 8, Szeged, H-6720, Hungary
| | - Ádám Polyákovics
- Material and Solution Structure Research Group, Institute of Chemistry, University of Szeged, Aradi Vértanú k tere 1, Szeged, H-6720, Hungary
| | - Katalin Musza
- Department of Organic Chemistry, University of Szeged, Dóm tér 8, Szeged, H-6720, Hungary
| | - Zoltán Kónya
- Department of Applied and Environmental Chemistry, University of Szeged, Rerrich B. tér 1, Szeged, H-6720, Hungary
| | - Ákos Kukovecz
- Department of Applied and Environmental Chemistry, University of Szeged, Rerrich B. tér 1, Szeged, H-6720, Hungary
| | - Pál Sipos
- Material and Solution Structure Research Group, Institute of Chemistry, University of Szeged, Aradi Vértanú k tere 1, Szeged, H-6720, Hungary
| | - István Pálinkó
- Department of Organic Chemistry, University of Szeged, Dóm tér 8, Szeged, H-6720, Hungary
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38
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Bugris V, Dudás C, Kutus B, Harmat V, Csankó K, Brockhauser S, Pálinkó I, Turner P, Sipos P. Crystal and solution structures of calcium complexes relevant to problematic waste disposal: calcium gluconate and calcium isosaccharinate. Acta Crystallogr B Struct Sci Cryst Eng Mater 2018. [DOI: 10.1107/s2052520618013720] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The single-crystal structures of calcium D-gluconate and calcium α-D-isosaccharinate have been determined using X-ray diffraction at 100 K. Surprisingly, given its significance in industrial and medical applications, the structure of calcium D-gluconate has not previously been reported. Unexpectedly, the gluconate crystal structure comprises coordination polymers. Unusually, the calcium coordination number is nine. Adjacent metal centres are linked by three μ-oxo bridges, with a metal–metal separation of 3.7312 (2) Å. One of the gluconate ligands contradicts a suggestion from 1974 that a straight chain conformation is associated with an intramolecular hydrogen bond. This ligand binds to three adjacent metal centres. The use of synchrotron radiation provided an improved crystal structure with respect to that previously reported for the isosaccharinate complex, allowing the location of the hydroxy hydrogen sites to be elucidated. In contrast to the gluconate structure, there are no μ-oxo bridges in the isosaccharinate coordination polymer and the isosaccharinate bridging coordination is such that the distance between adjacent metal centres, each of which is eight-coordinate, is 6.7573 (4) Å. Complementing the crystal structure determinations, modelling studies of the geometries and coordination modes for the aqueous [CaGluc]+ and [CaIsa]+ complexes are presented and discussed.
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Sipos P, Pálinkó I. As-prepared and intercalated layered double hydroxides of the hydrocalumite type as efficient catalysts in various reactions. Catal Today 2018. [DOI: 10.1016/j.cattod.2016.12.004] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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40
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Kutus B, Dudás C, Peintler G, Pálinkó I, Sipos P. Configuration-dependent complex formation between Ca(II) and sugar carboxylate ligands in alkaline medium: Comparison of L-gulonate with D-gluconate and D-heptaguconate. Carbohydr Res 2018; 460:34-40. [DOI: 10.1016/j.carres.2018.01.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Revised: 01/31/2018] [Accepted: 01/31/2018] [Indexed: 11/25/2022]
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41
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Varga G, Timár Z, Muráth S, Kónya Z, Kukovecz Á, Carlson S, Sipos P, Pálinkó I. Syntheses, characterization and catalytic activities of CaAl-layered double hydroxide intercalated Fe(III)-amino acid complexes. Catal Today 2018. [DOI: 10.1016/j.cattod.2016.12.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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42
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Ötvös SB, Mészáros R, Varga G, Kocsis M, Kónya Z, Kukovecz Á, Pusztai P, Sipos P, Pálinkó I, Fülöp F. A mineralogically-inspired silver–bismuth hybrid material: an efficient heterogeneous catalyst for the direct synthesis of nitriles from terminal alkynes. Green Chem 2018. [DOI: 10.1039/c7gc02487h] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
A silver-containing hybrid material is reported as an effective heterogeneous catalyst for the direct synthesis of organic nitriles from terminal alkynes.
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43
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Ziegenheim S, Varga G, Szabados M, Sipos P, Pálinkó I. Cu(II)Cr(III)-LDH: synthesis, characterization, intercalation properties and a catalytic application. Chem Pap 2017. [DOI: 10.1007/s11696-017-0352-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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44
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Szabados M, Varga G, Kónya Z, Kukovecz Á, Carlson S, Sipos P, Pálinkó I. Ultrasonically-enhanced preparation, characterization of CaFe-layered double hydroxides with various interlayer halide, azide and oxo anions (CO 32-, NO 3-, ClO 4-). Ultrason Sonochem 2017; 40:853-860. [PMID: 28946496 DOI: 10.1016/j.ultsonch.2017.08.041] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2017] [Revised: 08/24/2017] [Accepted: 08/24/2017] [Indexed: 11/29/2022]
Abstract
An ultrasonically-enhanced mechanochemical method was developed to synthesize CaFe-layered double hydroxides (LDHs) with various interlayer anions (CO32-, NO3-, ClO4-, N3-, F-, Cl-, Br- and I-). The duration of pre-milling and ultrasonic irradiation and the variation of synthesis temperature in the wet chemical step were investigated to obtain the optimal parameters of preparation. The main method to characterize the products was X-ray diffractometry, but infrared and synchrotron-based X-ray absorption spectroscopies as well as thermogravimetric measurements were also used to learn about fine structural details. The synthesis method afforded successful intercalation of the anions, among others the azide anion, a rarely used counter ion providing a system, which enables safe handling the otherwise highly reactive anion. The X-ray absorption spectroscopic measurements revealed that the quality of the interlayered anions could modulate the spatial arrangement of the calcium ions around the iron(III) ions, but only in the second coordination sphere.
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Affiliation(s)
- Márton Szabados
- Department of Organic Chemistry, University of Szeged, Dóm tér 8, Szeged H-6720, Hungary; Material and Solution Structure Research Group, Institute of Chemistry, University of Szeged, Aradi Vértanúk tere 1, Szeged H-6720, Hungary
| | - Gábor Varga
- Department of Organic Chemistry, University of Szeged, Dóm tér 8, Szeged H-6720, Hungary; Material and Solution Structure Research Group, Institute of Chemistry, University of Szeged, Aradi Vértanúk tere 1, Szeged H-6720, Hungary
| | - Zoltán Kónya
- Department of Applied and Environmental Chemistry, University of Szeged, Rerrich B. tér 1, Szeged H-6720, Hungary; MTA-SZTE Reaction Kinetics and Surface Chemistry Research Group, Rerrich B tér 1, Szeged H-6720, Hungary
| | - Ákos Kukovecz
- Department of Applied and Environmental Chemistry, University of Szeged, Rerrich B. tér 1, Szeged H-6720, Hungary
| | - Stefan Carlson
- MAX IV Laboratory, University of Lund, Ole Römers väg 1, Lund SE-223 63, Sweden
| | - Pál Sipos
- Material and Solution Structure Research Group, Institute of Chemistry, University of Szeged, Aradi Vértanúk tere 1, Szeged H-6720, Hungary; Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, Szeged H-6720, Hungary
| | - István Pálinkó
- Department of Organic Chemistry, University of Szeged, Dóm tér 8, Szeged H-6720, Hungary; Material and Solution Structure Research Group, Institute of Chemistry, University of Szeged, Aradi Vértanúk tere 1, Szeged H-6720, Hungary.
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45
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Schüpbach P, Pappova E, Schilt W, Kollar J, Kollar M, Sipos P, Vucic D. Perfusate Oncotic Pressure During Cardiopulmonary Bypass. Vox Sang 2017. [DOI: 10.1159/000465247] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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46
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Muráth S, Dudás C, Kukovecz Á, Kónya Z, Sipos P, Pálinkó I. From nicotinate-containing layered double hydroxides (LDHs) to NAD coenzyme–LDH nanocomposites – Syntheses and structural characterization by various spectroscopic methods. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2016.11.083] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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47
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Varga G, Timár Z, Muráth S, Kónya Z, Kukovecz Á, Carlson S, Sipos P, Pálinkó I. Ni-Amino Acid–CaAl-Layered Double Hydroxide Composites: Construction, Characterization and Catalytic Properties in Oxidative Transformations. Top Catal 2017. [DOI: 10.1007/s11244-017-0824-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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48
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Dudás C, Kutus B, Böszörményi É, Peintler G, Kele Z, Pálinkó I, Sipos P. Comparison of the Ca2+ complexing properties of isosaccharinate and gluconate – is gluconate a reliable structural and functional model of isosaccharinate? Dalton Trans 2017; 46:13888-13896. [DOI: 10.1039/c7dt03120c] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
During the interactions of α-d-isosaccharinate and d-gluconate with Ca2+ in aqueous solution, differences rather than similarities prevail.
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Affiliation(s)
- C. Dudás
- Department of Inorganic and Analytical Chemistry
- University of Szeged
- Szeged
- Hungary
| | - B. Kutus
- Department of Inorganic and Analytical Chemistry
- University of Szeged
- Szeged
- Hungary
| | - É. Böszörményi
- Department of Inorganic and Analytical Chemistry
- University of Szeged
- Szeged
- Hungary
| | - G. Peintler
- Department of Physical Chemistry and Material Science
- University of Szeged
- Szeged
- Hungary
| | - Z. Kele
- Department of Medical Chemistry
- University of Szeged
- Hungary
| | - I. Pálinkó
- Department of Organic Chemistry
- University of Szeged
- Hungary
| | - P. Sipos
- Department of Inorganic and Analytical Chemistry
- University of Szeged
- Szeged
- Hungary
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Kutus B, Varga N, Peintler G, Lupan A, Attia AAA, Pálinkó I, Sipos P. Formation of mono- and binuclear neodymium(iii)–gluconate complexes in aqueous solutions in the pH range of 2–8. Dalton Trans 2017; 46:6049-6058. [DOI: 10.1039/c7dt00909g] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The structure and stability constants of four mononuclear and two, so far unknown and highly stable binuclear complexes have been determined.
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Affiliation(s)
- Bence Kutus
- Department of Inorganic and Analytical Chemistry
- University of Szeged
- H-6720 Szeged
- Hungary
- Material and Solution Structure Research Group
| | - Norbert Varga
- Department of Inorganic and Analytical Chemistry
- University of Szeged
- H-6720 Szeged
- Hungary
- Material and Solution Structure Research Group
| | - Gábor Peintler
- Department of Physical Chemistry and Material Science
- University of Szeged
- H-6720 Szeged
- Hungary
- Material and Solution Structure Research Group
| | - Alexandru Lupan
- Department of Chemistry
- Babes-Bolyai University
- Cluj-Napoca
- Romania
| | - Amr A. A. Attia
- Department of Chemistry
- Babes-Bolyai University
- Cluj-Napoca
- Romania
| | - István Pálinkó
- Department of Organic Chemistry
- University of Szeged
- H-6720 Szeged
- Hungary
- Material and Solution Structure Research Group
| | - Pál Sipos
- Department of Inorganic and Analytical Chemistry
- University of Szeged
- H-6720 Szeged
- Hungary
- Material and Solution Structure Research Group
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50
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Kutus B, Ozsvár D, Varga N, Pálinkó I, Sipos P. ML and ML2 complex formation between Ca(ii) and d-glucose derivatives in aqueous solutions. Dalton Trans 2017; 46:1065-1074. [DOI: 10.1039/c6dt04356a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Besides the well-known ML species, Ca(ii) forms ML2 complexes with carbohydrates having at least one carboxylate group and conformational flexibility.
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Affiliation(s)
- Bence Kutus
- Department of Inorganic and Analytical Chemistry
- University of Szeged
- H-6720 Szeged
- Hungary
- Materials and Solution Structure Research Group
| | - Dániel Ozsvár
- Department of Inorganic and Analytical Chemistry
- University of Szeged
- H-6720 Szeged
- Hungary
- Materials and Solution Structure Research Group
| | - Norbert Varga
- Department of Inorganic and Analytical Chemistry
- University of Szeged
- H-6720 Szeged
- Hungary
- Materials and Solution Structure Research Group
| | - István Pálinkó
- Department of Organic Chemistry
- University of Szeged
- H-6720 Szeged
- Hungary
- Materials and Solution Structure Research Group
| | - Pál Sipos
- Department of Inorganic and Analytical Chemistry
- University of Szeged
- H-6720 Szeged
- Hungary
- Materials and Solution Structure Research Group
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