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Larsson, Anna-Carin
Publications (10 of 30) Show all publications
Patra, A., Taner, H. A., Bordes, R., Holmberg, K. & Larsson, A.-C. (2018). Selective flotation of calcium minerals using double-headed collectors. Journal of Dispersion Science and Technology
Open this publication in new window or tab >>Selective flotation of calcium minerals using double-headed collectors
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2018 (English)In: Journal of Dispersion Science and Technology, ISSN 0193-2691, E-ISSN 1532-2351Article in journal (Refereed) Epub ahead of print
Abstract [en]

A study was performed involving a series of double-headed carboxylate collectors with varying distance between the head groups (one, two or three carbon atoms). A collector with the same alkyl chain length but with only one carboxylate group was also included. All these were amino-acid based amphiphiles and the polar head group was connected to the hydrophobic tail via an amide linkage. Selective flotation recovery of different calcium minerals using these collectors was investigated. The double-headed collector with one carbon atom between the carboxylate groups was an apatite and fluorite specific reagent while the monocarboxylate surfactant showed high specificity for calcite. The flotation behavior of a simple conventional collector of the same alkyl chain length, a fatty acid salt, was also determined under identical flotation conditions in order to understand the effect of the amide group. Complementary experiments (ζ potential measurements, adsorption isotherm determinations) were also performed for these reagents. In order to shed light on the selectivity obtained with the dicarboxylate surfactants, the distances between the head groups were calculated and compared with the distances between neighboring calcium atoms on the surface of the minerals. It was found that the high degree of selectivity could be rationalized by perfect matching of these distances. To the best of our knowledge this is the first study where flotation selectivity in complex calcium mineral systems has been explained in terms of molecular recognition governing the interaction between the collector and the mineral surface.

Place, publisher, year, edition, pages
Taylor & Francis, 2018
National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-71355 (URN)10.1080/01932691.2018.1503547 (DOI)2-s2.0-85054840444 (Scopus ID)
Available from: 2018-10-26 Created: 2018-10-26 Last updated: 2018-11-22
Korneeva, E., Larsson, A.-C., Ivanov, A. V., Novikova, E., Smolentsev, A. & Antzutkin, O. (2017). Crystalline nickel(II) di-i-amyl dithiophosphate, [Ni{S2P(O-i-C5H11)2}2]: Preparation, structure, heteronuclear (13C, 31P) CP/MAS NMR spectra, and thermal behavior. Russian journal of coordination chemistry, 43(4), 223-231
Open this publication in new window or tab >>Crystalline nickel(II) di-i-amyl dithiophosphate, [Ni{S2P(O-i-C5H11)2}2]: Preparation, structure, heteronuclear (13C, 31P) CP/MAS NMR spectra, and thermal behavior
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2017 (English)In: Russian journal of coordination chemistry, ISSN 1070-3284, E-ISSN 1608-3318, Vol. 43, no 4, p. 223-231Article in journal (Refereed) Published
Abstract [en]

The crystalline nickel(II) di-i-amyl) dithiophosphate (Dtph), [Ni{S2P(O-i-C5H11)2}2] (I) was isolated on a preparative scale and characterized by 13C, 31P MAS NMR, and X-ray diffraction (CIF file CCDC no. 1469369). The χ2-statistic diagrams were constructed from full 31P CP/MAS NMR spectra for calculating the 31P chemical shift anisotropy: δaniso = δzz–δiso and the asymmetry parameter η = (δyy–δxx)/(δzz–δiso). The key structural unit of I is the centrosymmetric [Ni{S2P(O-i-C5H11)2}2] molecule in which the nickel atom coordinates two Dtph ligands in the isobidentate fashion. In molecule I, each carbon, oxygen, and sulfur atom is statistically disordered over two sites with equal occupancies. However, the disorder does not affect nickel and phosphorus. These results were interpreted as the presence in I of two [Ni{S2P(O-i-C5H11)2}2] molecules rotated through 21.0(1)° (the angle between the [NiS4] chromophore planes) relative to each other around the bisecting P–Ni–P axis passing through both four-membered [NiS2P] rings. The two molecules occupy crystal lattice sites with equal probabilities. The thermal behavior of I was studied by simultaneous thermal analysis under argon. The course of the thermal destruction of the complex was established, nickel pyrophosphate (Ni2P2O7) was identified as the final product of thermal transformations.

Place, publisher, year, edition, pages
Springer, 2017
National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-63126 (URN)10.1134/S1070328417040030 (DOI)000399830100004 ()2-s2.0-85018504670 (Scopus ID)
Note

Validerad; 2017; Nivå 2; 2017-04-24 (andbra)

Available from: 2017-04-24 Created: 2017-04-24 Last updated: 2018-09-14Bibliographically approved
Gowda, V., Sarma, B., Laitinen, R. S., Larsson, A.-C., Ivanov, A. V., Iuga, D., . . . Antzutkin, O. (2017). Structural insights into the polymorphism of bismuth(III) di-n-butyldithiocarbamate by X-ray diffraction, solid-state (13C/15N) CP-MAS NMR and DFT calculations. Polyhedron, 129, 123-132
Open this publication in new window or tab >>Structural insights into the polymorphism of bismuth(III) di-n-butyldithiocarbamate by X-ray diffraction, solid-state (13C/15N) CP-MAS NMR and DFT calculations
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2017 (English)In: Polyhedron, ISSN 0277-5387, E-ISSN 1873-3719, Vol. 129, p. 123-132Article in journal (Refereed) Published
Abstract [en]

Two crystalline polymorphs of a binuclear tris(di-n-butyldithiocarbamato)bismuth(III) complex, I and II, with an empirical formula of [Bi{S2CN(n-C4H9)2}3] were synthesised and characterised by X-ray diffraction (XRD), solid-state NMR and density functional theory (DFT) calculations. At the supramolecular level, these mononuclear molecular units interact in pairs via secondary Bi⋯S bonds, yielding binuclear formations of [Bi2{S2CN(n-C4H9)2}6]. The polymorph I () contains two isomeric non-centrosymmetric binuclear molecules of [Bi2{S2CN(n-C4H9)2}6], which are related to each other as conformers, therefore having four structurally inequivalent bismuth atoms and twelve inequivalent dithiocarbamate ligands. In contrast, the structurally simpler polymorph II (P21/n) exists as a single molecular form of the corresponding centrosymmetric binuclear formation, comprising two structurally equivalent bismuth atoms and three structurally different dithiocarbamate groups. The polymorphs I and II were found to be interconvertible by altering the solvent system during the recrystallisation process. Sun et al. (2012) has reported a crystalline form of the title compound which resembles, but is not identical with, polymorph II. Experimental solid-state 13C and 15N cross-polarisation (CP) magic-angle-spinning (MAS) NMR spectra of both polymorphs I and II were in accord with the direct structural data on these complexes. Assignments of the resonance lines in the solid-state 13C and 15N NMR spectra were assisted by chemical shift calculations of the crystals using periodic DFT.

Place, publisher, year, edition, pages
Elsevier, 2017
National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-62688 (URN)10.1016/j.poly.2017.03.018 (DOI)000401382500017 ()2-s2.0-85017200488 (Scopus ID)
Note

Validerad; 2017; Nivå 2; 2017-04-12 (rokbeg)

Available from: 2017-03-27 Created: 2017-03-27 Last updated: 2018-09-13Bibliographically approved
Gowda, V., Laitinen, R. S., Telkki, V.-V., Larsson, A.-C., Antzutkin, O. & Lantto, P. (2016). DFT calculations in the assignment of solid-state NMR and crystal structure elucidation of a lanthanum(iii) complex with dithiocarbamate and phenanthroline. Dalton Transactions, 45(48), 19473-19484
Open this publication in new window or tab >>DFT calculations in the assignment of solid-state NMR and crystal structure elucidation of a lanthanum(iii) complex with dithiocarbamate and phenanthroline
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2016 (English)In: Dalton Transactions, ISSN 1477-9226, E-ISSN 1477-9234, Vol. 45, no 48, p. 19473-19484Article in journal (Refereed) Published
Abstract [en]

The molecular, crystal, and electronic structures as well as spectroscopic properties of a mononuclear heteroleptic lanthanum(iii) complex with diethyldithiocarbamate and 1,10-phenanthroline ligands (3 : 1) were studied by solid-state 13C and 15N cross-polarisation (CP) magic-angle-spinning (MAS) NMR, X-ray diffraction (XRD), and first principles density functional theory (DFT) calculations. A substantially different powder XRD pattern and 13C and 15N CP-MAS NMR spectra indicated that the title compound is not isostructural to the previously reported analogous rare earth complexes with the space group P21/n. Both 13C and 15N CP-MAS NMR revealed the presence of six structurally different dithiocarbamate groups in the asymmetric unit cell, implying a non-centrosymmetric packing arrangement of molecules. This was supported by single-crystal X-ray crystallography showing that the title compound crystallised in the triclinic space group P1[combining macron]. In addition, the crystal structure also revealed that one of the dithiocarbamate ligands has a conformational disorder. NMR chemical shift calculations employing the periodic gauge including projector augmented wave (GIPAW) approach supported the assignment of the experimental 13C and 15N NMR spectra. However, the best correspondences were obtained with the structure where the atomic positions in the X-ray unit cell were optimised at the DFT level. The roles of the scalar and spin-orbit relativistic effects on NMR shielding were investigated using the zeroth-order regular approximation (ZORA) method with the outcome that already the scalar relativistic level qualitatively reproduces the experimental chemical shifts. The electronic properties of the complex were evaluated based on the results of the natural bond orbital (NBO) and topology of the electron density analyses. Overall, we apply a multidisciplinary approach acquiring comprehensive information about the solid-state structure and the metal-ligand bonding of the heteroleptic lanthanum complex.

National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-61144 (URN)10.1039/c6dt03705d (DOI)000390470400035 ()27891541 (PubMedID)2-s2.0-85002666619 (Scopus ID)
Note

Validerad; 2017; Nivå 2; 2016-12-19 (andbra)

Available from: 2016-12-19 Created: 2016-12-19 Last updated: 2018-07-10Bibliographically approved
Gowda, V., Sarma, B., Öberg, S., Telkki, V.-V., Larsson, A.-C., Lantto, P. & Antzutkin, O. (2016). Structure Elucidation of an Yttrium Diethyldithiocarbamato-Phenanthroline Complex by X-ray Crystallography, Solid-State NMR, and ab-initio Quantum Chemical Calculations (ed.). Paper presented at . European Journal of Inorganic Chemistry, 20, 3278-3291
Open this publication in new window or tab >>Structure Elucidation of an Yttrium Diethyldithiocarbamato-Phenanthroline Complex by X-ray Crystallography, Solid-State NMR, and ab-initio Quantum Chemical Calculations
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2016 (English)In: European Journal of Inorganic Chemistry, ISSN 1434-1948, E-ISSN 1099-1948, Vol. 20, p. 3278-3291Article in journal (Refereed) Published
Abstract [en]

We present a structural analysis method for molecular and electronic structure of yttrium diethyldithiocarbamato-phenanthroline complex {[Y(S2CNR2)3PHEN] with R = C2H5 and PHEN = 1,10-phenanthroline} combining solid-state NMR spectroscopy, XRD, and first principles DFT calculations. Replacing the Nd3+ ion with Y3+ in the reported crystal structure of [Nd(S2CNR2)3PHEN] complex generated an approximate 3D structure of the title complex. The structure was then subjected to first principles quantum chemical geometry optimisation using periodic DFT method. The quality of the method is discussed by comparing predicted and experimental powder XRD patterns. Full assignment of 13C and 15N solid-state CP-MAS NMR spectra as well as analyses of the principal values of the chemical shift tensors were carried out using periodic scalar relativistic DFT modelling. Spin-orbit relativistic effects, estimated by SO-ZORA formalism for one molecular unit, were evaluated. Finally, the X-ray structure of the title complex was determined, which proved that the former procedure is appropriate. The most important orbital interactions were investigated by Natural Bond Orbital analysis. The isotropic shielding values for S2CN-carbons were analysed by Natural Localised Molecular Orbital analysis. The present approach can be further extended to study other rare earth metal complexes, particularly those having similar but not yet solved crystal structures

National Category
Physical Chemistry Other Physics Topics
Research subject
Chemistry of Interfaces; Tillämpad fysik
Identifiers
urn:nbn:se:ltu:diva-15691 (URN)10.1002/ejic.201600059 (DOI)000379985600009 ()2-s2.0-84978397931 (Scopus ID)f3cebb95-1de1-4acf-b56e-aebed545a76c (Local ID)f3cebb95-1de1-4acf-b56e-aebed545a76c (Archive number)f3cebb95-1de1-4acf-b56e-aebed545a76c (OAI)
Note
Validerad; 2016; Nivå 2; 20160615 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Ruyter-Hooley, M., Larsson, A.-C., Johnson, B. B., Antzutkin, O. & Angove, M. J. (2016). The effect of inositol hexaphosphate on cadmium sorption to gibbsite (ed.). Paper presented at . Journal of Colloid and Interface Science, 474, 159-170
Open this publication in new window or tab >>The effect of inositol hexaphosphate on cadmium sorption to gibbsite
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2016 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 474, p. 159-170Article in journal (Refereed) Published
Abstract [en]

HypothesisOxides, hydrous oxides and hydroxides of aluminium and iron are important in determining the availability of trace and heavy metals in soil systems. The presence of complexing anions is also known to affect the binding of these metals in soils. Since organophosphates, such as inositol hexaphosphate (IP6), are present in most soil systems they are expected to affect the nature of the interaction between metal ions and metal (hyr)oxides.ExperimentsBoth adsorption edge and isotherm experiments were conducted on Cd(II)–gibbsite and Cd(II)–IP6–gibbsite systems. In addition, solid-state 31P MAS NMR measurements were performed on the ternary system. All results were used to develop Extended Constant Capacitance surface complexation models of both the Cd(II)–gibbsite and IP6–Cd(II)–gibbsite sorption systems.FindingsThe presence of IP6 significantly increased sorption of Cd(II) to gibbsite below pH 8 especially at higher concentrations of Cd(II) and IP6. The 31P MAS NMR spectra, together with surface complexation modeling, indicated the presence of two outer-sphere ternary complexes with the first, [(SOH2)33+–(LHCd)9-]6-, important at relatively low concentrations, while the second, [SLH38-−Cd2+]6-, dominated sorption at higher sorbate concentrations. Thus the presence of organophosphates in soil systems increases sorption and may therefore decrease the availability of trace and heavy metals to plants.

National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-3660 (URN)10.1016/j.jcis.2016.04.028 (DOI)000376331600020 ()27124810 (PubMedID)2-s2.0-84963984714 (Scopus ID)17a3abce-9ba5-4f39-96e3-109b3b27d9e8 (Local ID)17a3abce-9ba5-4f39-96e3-109b3b27d9e8 (Archive number)17a3abce-9ba5-4f39-96e3-109b3b27d9e8 (OAI)
Note
Validerad; 2016; Nivå 2; 20160421 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Ruyter-Hooley, M., Larsson, A.-C., Johnson, B. B., Antzutkin, O. & Angove, M. J. (2015). Surface complexation modeling of inositol hexaphosphate sorption onto gibbsite (ed.). Paper presented at . Journal of Colloid and Interface Science, 440, 282-291
Open this publication in new window or tab >>Surface complexation modeling of inositol hexaphosphate sorption onto gibbsite
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2015 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 440, p. 282-291Article in journal (Refereed) Published
Abstract [en]

The sorption of Inositol hexaphosphate (IP6) onto gibbsite was investigated using a combination of adsorption experiments, 31P solid-state MAS NMR spectroscopy, and surface complexation modelling. Adsorption experiments conducted at four temperatures showed that IP6 sorption decreased with increasing pH. At pH 6, IP6 sorption increased with increasing temperature, while at pH 10 sorption decreased as the temperature was raised. 31P MAS NMR measurements at pH 3, 6, 9 and 11 produced spectra with broad resonance lines that could be de-convoluted with up to five resonances (+5, 0, -6, -13 and -21 ppm). The chemical shifts suggest the sorption process involves a combination of both outer- and inner-sphere complexation and surface precipitation. Relative intensities of the observed resonances indicate that outer-sphere complexation is important in the sorption process at higher pH, while inner-sphere complexation and surface precipitation are dominant at lower pH. Using the adsorption and 31P MAS NMR data, IP6 sorption to gibbsite was modelled with an Extended Constant Capacitance Model (ECCM). The adsorption reactions that best described the sorption of IP6 to gibbsite included two inner-sphere surface complexes and one outer-sphere complex:

National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-5520 (URN)10.1016/j.jcis.2014.10.065 (DOI)000346461100035 ()25460716 (PubMedID)2-s2.0-84911902399 (Scopus ID)3a483afd-8dc1-4e63-a607-e4bafe355495 (Local ID)3a483afd-8dc1-4e63-a607-e4bafe355495 (Archive number)3a483afd-8dc1-4e63-a607-e4bafe355495 (OAI)
Note
Validerad; 2015; Nivå 2; 20141117 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Korneeva, E. V., Rodina, T. A., Ivanov, A. V., Gerasimenko, A. V. & Larsson, A.-C. (2014). Polymeric Gold(I) Diisobutyl Dithiophosphate, [Au2{S2P(O-iso-C4H9)2}2]n: Synthesis, Supramolecular Self-Organisation (a Role of Aurophilic Interaction), 13C and 31P MAS NMR Spectroscopy, and Thermal Behavior (ed.). Paper presented at . Russian journal of coordination chemistry, 40(10), 748-756
Open this publication in new window or tab >>Polymeric Gold(I) Diisobutyl Dithiophosphate, [Au2{S2P(O-iso-C4H9)2}2]n: Synthesis, Supramolecular Self-Organisation (a Role of Aurophilic Interaction), 13C and 31P MAS NMR Spectroscopy, and Thermal Behavior
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2014 (English)In: Russian journal of coordination chemistry, ISSN 1070-3284, E-ISSN 1608-3318, Vol. 40, no 10, p. 748-756Article in journal (Refereed) Published
Abstract [en]

A new polymeric gold(I) diisobutyl dithiophosphate (Dtph), [Au2{S2P(O-iso-C4H9)2}2] n (I), was preparatively obtained and characterized by 13C and 31P MAS NMR spectroscopy and X-ray diffraction (CIF file CCDC no. 977818). Diagrams of the χ2 statistic were constructed from the complete 31P MAS NMR spectra and used to calculate the 31P chemical shift anisotropy (δ aniso = δ zz − δ iso ) and the asymmetry parameter η = (δ yy − δ xx )/(δ zz − δ iso ). The main structural unit of complex I is the noncentrosymmetric dinuclear molecule [Au2{S2P(O-iso-C4H9)2}2], in which the gold atoms are linked by two bridging ligands Dtph. The central cyclic structural fragment of the dimer [Au2S4P2] is additionally stabilized by the intramolecular aurophilic interaction Au⋯Au. Further supramolecular self-organization of the complex involves intermolecular aurophilic bonds Au⋯Au that serve to unite adjacent dinuclear molecules [Au2{S2P(O-iso-C4H9)2}2] with different spatial orientations into the polymer chains ([Au2{S2P(O-iso-C4H9)2}2]) n . The thermal behavior of complex I was examined by synchronous thermal analysis under argon. The character of the thermolysis of the complex to reduced metallic gold as a final product was determined.

National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-13861 (URN)d29c8788-8712-45ac-b557-d76155d3aac0 (Local ID)d29c8788-8712-45ac-b557-d76155d3aac0 (Archive number)d29c8788-8712-45ac-b557-d76155d3aac0 (OAI)
Note
Validerad; 2014; 20140813 (acla)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved
Ivanov, A., Korneeva, E. V., Lutsenko, I. A., Gerasimenko, A. V., Antzutkin, O., Larsson, A.-C. & Sergienko, V. I. (2013). A fixation mode of gold from solutions using heterogeneous reaction of cadmium dicyclohexyl dithiophosphate with H[AuCl4]. Structural and (13C, 31P) CP/MAS NMR studies and thermal behaviour of crystalline polymeric gold(I) dicyclohexyl dithiophosphate and bis(dicyclohexylthiophosphoryl) disulphide (ed.). Paper presented at . Journal of Molecular Structure, 1034, 152-161
Open this publication in new window or tab >>A fixation mode of gold from solutions using heterogeneous reaction of cadmium dicyclohexyl dithiophosphate with H[AuCl4]. Structural and (13C, 31P) CP/MAS NMR studies and thermal behaviour of crystalline polymeric gold(I) dicyclohexyl dithiophosphate and bis(dicyclohexylthiophosphoryl) disulphide
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2013 (English)In: Journal of Molecular Structure, ISSN 0022-2860, E-ISSN 1872-8014, Vol. 1034, p. 152-161Article in journal (Refereed) Published
Abstract [en]

Two novel compounds: polynuclear catena-poly[bis(3-O,O’-di-cyclo-hexyldithiophosphato-S,S,S’)digold(I)] (Au–Au) (1) and crystalline bis(O,O’-di-cyclo-hexylthiophosphoryl)disulphide, (cyclo-C6H11O)2P(S)S–S(S)P(O-cyclo-C6H11) (2) were prepared using heterogeneous reaction between freshly precipitated binuclear cadmium(II) dithiophosphate (Dtph), [Cd2{S2P(O-cyclo-C6H11}4] and H[AuCl4] in 2 M hydrochloric acid. The isolated compounds 1 and 2 (the fixation mode of gold from the solution and the oxidised form of Dtph groups, respectively) have been studied by means of single-crystal X-ray diffraction, 13C and 31P cross-polarisation / magic-angle-spinning (CP/MAS) NMR spectroscopy and simultaneous thermal analysis (STA). Centrosymmetric binuclear molecule of 1, [Au2{S2P(O-cyclo-C6H11)2}2] comprises a pair of -bridging di-cyclo-hexyl Dtph ligands, linking two neighbouring gold atoms, and displays additional intramolecular aurophilic bond Au···Au. At the supramolecular level of structural self-organisation of complex 1, infinite polymeric zigzag chains arise due to pairs of the secondary bonds Au···S between neighbouring binuclear molecules. Centrosymmetric molecule of 2 displays two O,O-di-cyclo-hexythiophosphoryl fragments, which are connected by the chemical bond S(1)–S(1)a, and a planar zigzag array [S=P–S–S–P=S] passing through the central part of the molecule. To characterise additionally the Dtph groups in both compounds 1 and 2, chemical shift anisotropy (CSA) parameters (aniso and) were calculated from spinning sideband manifolds in experimental 31P MAS NMR spectra. The thermal behaviour of complex 1 was studied using simultaneous thermal analysis (a combination of TG and DSC) under an argon atmosphere. The thermal behaviour displays stepwise mass loss, comprising thermal decompositions of the organic and inorganic parts of 1 with gold(I) dithio-meta-phosphate and reduced metallic gold as the intermediate and the final products, respectively.

National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-13180 (URN)10.1016/j.molstruc.2012.08.052 (DOI)000314554800021 ()2-s2.0-84867132154 (Scopus ID)c5e6a5d3-167f-4da0-afbf-4125570049f5 (Local ID)c5e6a5d3-167f-4da0-afbf-4125570049f5 (Archive number)c5e6a5d3-167f-4da0-afbf-4125570049f5 (OAI)
Note
Validerad; 2013; 20120914 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Nooshabadi, A. J., Larsson, A.-C. & Kota, H. R. (2013). Formation of hydrogen peroxide by pyrite and its influence on flotation (ed.). Paper presented at . Minerals Engineering, 49, 128-134
Open this publication in new window or tab >>Formation of hydrogen peroxide by pyrite and its influence on flotation
2013 (English)In: Minerals Engineering, ISSN 0892-6875, E-ISSN 1872-9444, Vol. 49, p. 128-134Article in journal (Refereed) Published
Abstract [en]

Formation of hydrogen peroxide (H2O2), an oxidizing agent stronger than oxygen, by pyrite (FeS2), the most abundant metal sulphide on Earth, during grinding was investigated. It was found that pyrite generated H2O2 in pulp liquid during wet grinding and also the solids when placed in water immediately after dry grinding. Type of grinding medium on formation of hydrogen peroxide revealed that the mild steel produced more H2O2 than stainless steel grinding medium, where Fe2+ and/or Fe3+ ions played a key role in producing higher amounts of H2O2. The effect of grinding atmosphere of air and N2 gas showed that nitrogen environment free from oxygen generated more H2O2 than air atmosphere suggesting that the oxygen in hydrogen peroxide is derived from water molecules. In addition, the solids after dry grinding producing more H2O2 than wet grinding indicate the role of pyrite surface or its catalytic activity in producing H2O2 from water. This study highlights the necessity of relooking into the electrochemical and/or galvanic interaction mechanisms between the grinding medium and pyrite in terms of its flotation behaviour.

National Category
Physical Chemistry Metallurgy and Metallic Materials
Research subject
Chemistry of Interfaces; Mineral Processing
Identifiers
urn:nbn:se:ltu:diva-2574 (URN)10.1016/j.mineng.2013.05.016 (DOI)000322289500018 ()2-s2.0-84879069514 (Scopus ID)03475536-6077-4bbc-b1e6-c5f2694b223d (Local ID)03475536-6077-4bbc-b1e6-c5f2694b223d (Archive number)03475536-6077-4bbc-b1e6-c5f2694b223d (OAI)
Note
Validerad; 2013; 20130506 (alijav)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
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