1
|
Islam AF, Banerjee S. Toward Metal Extraction from Regolith: Theoretical Investigation of the Solvation Structure and Dynamics of Metal Ions in Ionic Liquids. J Phys Chem B 2023; 127:9985-9996. [PMID: 37944163 DOI: 10.1021/acs.jpcb.3c04057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2023]
Abstract
Lunar and Martian regoliths, containing feldspar, pyroxene, ilmenite, olivine, and aluminite minerals, are excellent sources of metals such as aluminum, sodium, magnesium, and iron. Ionic liquids (ILs), which are excellent solvents with extremely low vapor pressure and high electrochemical stability, can be potentially leveraged for extracting metals from regolith in an extra-terrestrial environment. A critical step in the solvation process, which determines the effectiveness of the IL solvent, is the formation of solvation shells around the metal cations. To determine the rigidity and stability of the solvation shells, which has a direct implication on the extraction of metals, we performed classical molecular dynamics simulations of dilute solutions comprising individual metal ions Na+, Mg2+, and Al3+ in two distinct ILs, [mppy][TFSI] and [mppy][HSO4]. Our results indicate that the compactness of the structure is directly related to the charge density of the metal cation and the relative size and symmetry of the IL anion. Potentials of the mean force of the metal cation with the solvating IL anion indicate the presence of energy minima with barriers that increase with the surface charge density of the cation. The increasing energy barrier leads to greater residence time of metal cations in the solvation shell, which was confirmed by evaluating corresponding autocorrelation functions. Overall, our calculations provide fundamental insights into key factors that influence the solvation of metals and can be useful in the screening of ILs for digestion of metal-containing minerals in lunar and Martian regoliths.
Collapse
Affiliation(s)
- Azmain F Islam
- School of Mechanical and Materials Engineering, Washington State University, Pullman Washington 99164-2920, United States
| | - Soumik Banerjee
- School of Mechanical and Materials Engineering, Washington State University, Pullman Washington 99164-2920, United States
| |
Collapse
|
2
|
Hawkins BE, Schoetz T, Gordon LW, Kt S, Wang J, Messinger RJ. Reversible Zinc Electrodeposition at -60 °C Using a Deep Eutectic Electrolyte for Low-Temperature Zinc Metal Batteries. J Phys Chem Lett 2023; 14:2378-2386. [PMID: 36848484 DOI: 10.1021/acs.jpclett.3c00150] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Rechargeable zinc (Zn) metal batteries are attractive for use as electrochemical energy storage systems on a global scale because of the low cost, high energy density, inherent safety, and strategic resource security of Zn metal. However, at low temperatures, Zn batteries typically suffer from high electrolyte viscosity and unfavorable ion transport properties. Here, we studied reversible Zn electrodeposition in mixtures of 1-ethyl-3-methyl-imidazolium bis(trifluoromethylsulfonyl)imide ([EMIm]TFSI) ionic liquid, γ-butyrolactone (GBL) organic solvent, and Zn(TFSI)2 zinc salt. The electrolyte mixtures enabled reversible Zn electrodeposition at temperatures as low as -60 °C. An electrolyte composed of 0.1 M Zn(TFSI)2 in [EMIm]TFSI:GBL with a volume ratio of 1:3 formed a deep eutectic solvent that optimized electrolyte conductivity, viscosity, and the zinc diffusion coefficient. Liquid-state 1H and 13C nuclear magnetic resonance (NMR) spectroscopy and molecular dynamic (MD) simulations indicate increased formation of contact ion pairs and the reduction of ion aggregates are responsible for the optimal composition.
Collapse
Affiliation(s)
- Brendan E Hawkins
- Department of Chemical Engineering, The City College of New York, 160 Convent Avenue, New York, New York 10031, United States
| | - Theresa Schoetz
- Department of Chemical Engineering, The City College of New York, 160 Convent Avenue, New York, New York 10031, United States
| | - Leo W Gordon
- Department of Chemical Engineering, The City College of New York, 160 Convent Avenue, New York, New York 10031, United States
| | - Surabh Kt
- Department of Chemical Engineering, The City College of New York, 160 Convent Avenue, New York, New York 10031, United States
| | - Jonah Wang
- Department of Chemical Engineering, The City College of New York, 160 Convent Avenue, New York, New York 10031, United States
| | - Robert J Messinger
- Department of Chemical Engineering, The City College of New York, 160 Convent Avenue, New York, New York 10031, United States
| |
Collapse
|
3
|
D'Angelo P, Migliorati V, Gibiino A, Busato M. Direct Observation of Contact Ion-Pair Formation in La 3+ Methanol Solution. Inorg Chem 2022; 61:17313-17321. [PMID: 36255362 PMCID: PMC9627567 DOI: 10.1021/acs.inorgchem.2c02932] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
![]()
An approach combining molecular dynamics (MD) simulations
and X-ray
absorption spectroscopy (XAS) has been used to carry out a comparative
study about the solvation properties of dilute La(NO3)3 solutions in water and methanol, with the aim of elucidating
the still elusive coordination of the La3+ ion in the latter
medium. The comparison between these two systems enlightened a different
behavior of the nitrate counterions in the two environments: while
in water the La(NO3)3 salt is fully dissociated
and the La3+ ion is coordinated by water molecules only,
the nitrate anions are able to enter the metal first solvation shell
to form inner-sphere complexes in methanol solution. The speciation
of the formed complexes showed that the 10-fold coordination is preferential
in methanol solution, where the nitrate anions coordinate the La3+ cations in a monodentate fashion and the methanol molecules
complete the solvation shell to form an overall bicapped square antiprism
geometry. This is at variance with the aqueous solution where a more
balanced situation is observed between the 9- and 10-fold coordination.
An experimental confirmation of the MD results was obtained by La
K-edge XAS measurements carried out on 0.1 M La(NO3)3 solutions in the two solvents, showing the distinct presence
of the nitrate counterions in the La3+ ion first solvation
sphere of the methanol solution. The analysis of the extended X-ray
absorption fine structure (EXAFS) part of the absorption spectrum
collected on the methanol solution was carried out starting from the
MD results and confirmed the structural arrangement observed by the
simulations. The formation of contact ion pairs between
the La3+ ions and the nitrate anions has been demonstrated
in diluted methanol
solution using a combined approach using Molecular Dynamics simulations
and X-ray absorption spectroscpy.
Collapse
Affiliation(s)
- Paola D'Angelo
- Department of Chemistry, University of Rome "La Sapienza", P.le Aldo Moro 5, 00185 Rome, Italy
| | - Valentina Migliorati
- Department of Chemistry, University of Rome "La Sapienza", P.le Aldo Moro 5, 00185 Rome, Italy
| | - Alice Gibiino
- Department of Chemistry, University of Rome "La Sapienza", P.le Aldo Moro 5, 00185 Rome, Italy
| | - Matteo Busato
- Department of Chemistry, University of Rome "La Sapienza", P.le Aldo Moro 5, 00185 Rome, Italy
| |
Collapse
|
4
|
Migliorati V, Busato M, D’Angelo P. Solvation structure of the Hg(NO3)2 and Hg(TfO)2 salts in dilute aqueous and methanol solutions: An insight into the Hg2+ coordination chemistry. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
5
|
Busato M, Fazio G, Tavani F, Pollastri S, D'Angelo P. Solubilization and coordination of the HgCl 2 molecule in water, methanol, acetone, and acetonitrile: an X-ray absorption investigation. Phys Chem Chem Phys 2022; 24:18094-18102. [PMID: 35880669 DOI: 10.1039/d2cp02106d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
X-ray absorption spectroscopy (XAS) has been employed to carry out structural characterization of the local environment around mercury after the dissolution of the HgCl2 molecule. A combined EXAFS (extended X-ray absorption fine structure) and XANES (X-ray absorption near edge structure) data analysis has been performed on the Hg L3-edge absorption spectra recorded on 0.1 M HgCl2 solutions in water, methanol (MeOH), acetone and acetonitrile. The Hg-Cl distance determined by EXAFS (2.29(2)-2.31(2) Å) is always comparable to that found in the HgCl2 crystal (2.31(2) Å), demonstrating that the HgCl2 molecule dissolves in these solvents without dissociating. A small sensitivity of EXAFS to the solvent molecules interacting with HgCl2 has been detected and indicates a high degree of configurational disorder associated with this contribution. XANES data analysis, which is less affected by the disorder, was therefore carried out for the first time on these systems to shed light into the still elusive structural arrangement of the solvent molecules around HgCl2. The obtained results show that, in aqueous and MeOH solutions, the XANES data are compatible with three solvent molecules arranged around the HgCl2 unit to form a trigonal bipyramidal structure. The determination of the three-body Cl-Hg-Cl distribution shows a certain degree of uncertainty around the average 180° bond angle value, suggesting that the HgCl2 molecule probably vibrates in the solution around a linear configuration.
Collapse
Affiliation(s)
- Matteo Busato
- Department of Chemistry, University of Rome "La Sapienza", P.le A. Moro 5, 00185, Rome, Italy.
| | - Giuseppe Fazio
- Department of Chemistry, University of Rome "La Sapienza", P.le A. Moro 5, 00185, Rome, Italy.
| | - Francesco Tavani
- Department of Chemistry, University of Rome "La Sapienza", P.le A. Moro 5, 00185, Rome, Italy.
| | - Simone Pollastri
- Elettra-Sincrotrone Trieste S.C.p.A, s.s. 14, km 163.5, I-34149, Basovizza, Trieste, Italy
| | - Paola D'Angelo
- Department of Chemistry, University of Rome "La Sapienza", P.le A. Moro 5, 00185, Rome, Italy.
| |
Collapse
|
6
|
Busato M, Tofoni A, Mannucci G, Tavani F, Del Giudice A, Colella A, Giustini M, D'Angelo P. On the Role of Water in the Formation of a Deep Eutectic Solvent Based on NiCl 2·6H 2O and Urea. Inorg Chem 2022; 61:8843-8853. [PMID: 35616906 PMCID: PMC9199011 DOI: 10.1021/acs.inorgchem.2c00864] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
![]()
The metal-based deep
eutectic solvent (MDES) formed by NiCl2·6H2O and urea in 1:3.5 molar ratio has been
prepared for the first time and characterized from a structural point
of view. Particular accent has been put on the role of water in the
MDES formation, since the eutectic could not be obtained with the
anhydrous form of the metal salt. To this end, mixtures at different
water/MDES molar ratios (W) have been studied with
a combined approach exploiting molecular dynamics and ab initio simulations, UV–vis and near-infra-red spectroscopies, small-
and wide-angle X-ray scattering, and X-ray absorption spectroscopy
measurements. In the pure MDES, a close packing of Ni2+ ion clusters forming oligomeric agglomerates is present thanks to
the mediation of bridging chloride anions and water molecules. Conversely,
urea poorly coordinates the metal ion and is mostly found in the interstitial
regions among the Ni2+ ion oligomers. This nanostructure
is disrupted upon the introduction of additional water, which enlarges
the Ni–Ni distances and dilutes the system up to an aqueous
solution of the MDES constituents. In the NiCl2·6H2O 1:3.5 MDES, the Ni2+ ion is coordinated on average
by one chloride anion and five water molecules, while water easily
saturates the metal solvation sphere to provide a hexa-aquo coordination
for increasing W values. This multidisciplinary study
allowed us to reconstruct the structural arrangement of the MDES and
its aqueous mixtures on both short- and intermediate-scale levels,
clarifying the fundamental role of water in the eutectic formation
and challenging the definition at the base of these complex systems. The metal-based deep eutectic solvent
formed by NiCl2·6H2O and urea in 1:3.5
a molar ratio was
prepared for the first time, and its aqueous mixtures were characterized
from a structural point of view, highlighting the fundamental role
of water in the eutectic formation.
Collapse
Affiliation(s)
- Matteo Busato
- Department of Chemistry, University of Rome "La Sapienza", P.le A. Moro 5, Rome 00185, Italy
| | - Alessandro Tofoni
- Department of Chemistry, University of Rome "La Sapienza", P.le A. Moro 5, Rome 00185, Italy
| | - Giorgia Mannucci
- Department of Chemistry, University of Rome "La Sapienza", P.le A. Moro 5, Rome 00185, Italy
| | - Francesco Tavani
- Department of Chemistry, University of Rome "La Sapienza", P.le A. Moro 5, Rome 00185, Italy
| | - Alessandra Del Giudice
- Department of Chemistry, University of Rome "La Sapienza", P.le A. Moro 5, Rome 00185, Italy
| | - Andrea Colella
- Department of Chemistry, University of Rome "La Sapienza", P.le A. Moro 5, Rome 00185, Italy
| | - Mauro Giustini
- Department of Chemistry, University of Rome "La Sapienza", P.le A. Moro 5, Rome 00185, Italy
| | - Paola D'Angelo
- Department of Chemistry, University of Rome "La Sapienza", P.le A. Moro 5, Rome 00185, Italy
| |
Collapse
|
7
|
Busato M, Del Giudice A, Di Lisio V, Tomai P, Migliorati V, Gentili A, Martinelli A, D’Angelo P. Fate of a Deep Eutectic Solvent upon Cosolvent Addition: Choline Chloride-Sesamol 1:3 Mixtures with Methanol. ACS SUSTAINABLE CHEMISTRY & ENGINEERING 2021; 9:12252-12261. [PMID: 34552826 PMCID: PMC8442355 DOI: 10.1021/acssuschemeng.1c03809] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Revised: 08/07/2021] [Indexed: 06/13/2023]
Abstract
The changes upon methanol (MeOH) addition in the structural arrangement of the highly eco-friendly deep eutectic solvent (DES) formed by choline chloride (ChCl) and sesamol in 1:3 molar ratio have been studied by means of attenuated total reflection Fourier transform infrared spectroscopy, small- and wide-angle X-ray scattering (SWAXS), and molecular dynamics simulations. The introduction of MeOH into the DES promotes the increase of the number of Cl-MeOH hydrogen bonds (HBs) through the replacement of sesamol and choline molecules from the chloride anion coordination sphere. This effect does not promote the sesamol-sesamol, choline-choline, and sesamol-choline interactions, which remain as negligible as in the pure DES. Differently, the displaced sesamol and choline molecules are solvated by MeOH, which also forms HBs with other MeOH molecules, so that the system arranges itself to keep the overall amount of HBs maximized. SWAXS measurements show that this mechanism is predominant up to MeOH/DES molar ratios of 20-24, while after this ratio value, the scattering profile is progressively diluted in the cosolvent background and decreases toward the signal of pure MeOH. The ability of MeOH to interplay with all of the DES components produces mixtures with neither segregation of the components at nanoscale lengths nor macroscopic phase separation even for high MeOH contents. These findings have important implications for application purposes since the understanding of the pseudophase aggregates formed by a DES with a dispersing cosolvent can help in addressing an efficient extraction procedure.
Collapse
Affiliation(s)
- Matteo Busato
- Department of Chemistry, University of Rome ”La Sapienza”, P.le A. Moro 5, 00185 Rome, Italy
| | - Alessandra Del Giudice
- Department of Chemistry, University of Rome ”La Sapienza”, P.le A. Moro 5, 00185 Rome, Italy
| | - Valerio Di Lisio
- Department of Chemistry, University of Rome ”La Sapienza”, P.le A. Moro 5, 00185 Rome, Italy
| | - Pierpaolo Tomai
- Department of Chemistry, University of Rome ”La Sapienza”, P.le A. Moro 5, 00185 Rome, Italy
| | - Valentina Migliorati
- Department of Chemistry, University of Rome ”La Sapienza”, P.le A. Moro 5, 00185 Rome, Italy
| | - Alessandra Gentili
- Department of Chemistry, University of Rome ”La Sapienza”, P.le A. Moro 5, 00185 Rome, Italy
| | - Andrea Martinelli
- Department of Chemistry, University of Rome ”La Sapienza”, P.le A. Moro 5, 00185 Rome, Italy
| | - Paola D’Angelo
- Department of Chemistry, University of Rome ”La Sapienza”, P.le A. Moro 5, 00185 Rome, Italy
| |
Collapse
|
8
|
Migliorati V, Gibiino A, Lapi A, Busato M, D'Angelo P. On the Coordination Chemistry of the lanthanum(III) Nitrate Salt in EAN/MeOH Mixtures. Inorg Chem 2021; 60:10674-10685. [PMID: 34236168 PMCID: PMC8389800 DOI: 10.1021/acs.inorgchem.1c01375] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
![]()
A thorough structural
characterization of the La(NO3)3 salt dissolved
into several mixtures of ethyl ammonium
nitrate (EAN) and methanol (MeOH) with EAN molar fraction χEAN ranging from 0 to 1 has been carried out by combining molecular
dynamics (MD) and X-ray absorption spectroscopy (XAS). The XAS and
MD results show that changes take place in the La3+ first
solvation shell when moving from pure MeOH to pure EAN. With increasing
the ionic liquid content of the mixture, the La3+ first-shell
complex progressively loses MeOH molecules to accommodate more and
more nitrate anions. Except in pure EAN, the La3+ ion is
always able to coordinate both MeOH and nitrate anions, with a ratio
between the two ligands that changes continuously in the entire concentration
range. When moving from pure MeOH to pure EAN, the La3+ first solvation shell passes from a 10-fold bicapped square antiprism
geometry where all the nitrate anions act only as monodentate ligands
to a 12-coordinated icosahedral structure in pure EAN where the nitrate
anions bind the La3+ cation both in mono- and bidentate
modes. The La3+ solvation structure formed in the MeOH/EAN
mixtures shows a great adaptability to changes in the composition,
allowing the system to reach the ideal compromise among all of the
different interactions that take place into it. The structural properties of the La(NO3)3 salt dissolved into EAN/methanol mixtures were
characterized
by molecular dynamics and X-ray absorption spectroscopy. The La3+ solvation shell undergoes significant changes with increasing
the ionic liquid content of the mixture, progressively losing methanol
molecules to accommodate more and more nitrate anions. The La3+ solvation structure shows great adaptability to composition
changes, passing from a 10-fold bicapped square antiprism geometry
in pure methanol to a 12-coordinated icosahedral complex in EAN.
Collapse
Affiliation(s)
- Valentina Migliorati
- Dipartimento di Chimica, "La Sapienza" Università di Roma, P.le Aldo Moro 5, 00185 Rome, Italy
| | - Alice Gibiino
- Dipartimento di Chimica, "La Sapienza" Università di Roma, P.le Aldo Moro 5, 00185 Rome, Italy
| | - Andrea Lapi
- Dipartimento di Chimica, "La Sapienza" Università di Roma, P.le Aldo Moro 5, 00185 Rome, Italy
| | - Matteo Busato
- Dipartimento di Chimica, "La Sapienza" Università di Roma, P.le Aldo Moro 5, 00185 Rome, Italy
| | - Paola D'Angelo
- Dipartimento di Chimica, "La Sapienza" Università di Roma, P.le Aldo Moro 5, 00185 Rome, Italy
| |
Collapse
|
9
|
Busato M, Lapi A, D’Angelo P, Melchior A. Coordination of the Co 2+ and Ni 2+ Ions in Tf 2N - Based Ionic Liquids: A Combined X-ray Absorption and Molecular Dynamics Study. J Phys Chem B 2021; 125:6639-6648. [PMID: 34109780 PMCID: PMC8279557 DOI: 10.1021/acs.jpcb.1c03395] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Revised: 05/30/2021] [Indexed: 11/29/2022]
Abstract
Molecular dynamics (MD) simulations and X-ray absorption spectroscopy (XAS) have been combined to study the coordination of the Co2+ and Ni2+ ions in ionic liquids (ILs) based on the bis(trifluoromethylsulfonyl)imide ([Tf2N]-) anion and having different organic cations, namely, 1-butyl-3-methylimidazolium ([C4mim]+), 1,8-bis(3-methylimidazolium-1-yl)octane ([C8(mim)2]2+), N,N,N-trimethyl-N-(2-hydroxyethyl)ammonium ([choline]+), and butyltrimethylammonium ([BTMA]+). Co and Ni K-edge XAS data have been collected on 0.1 mol L-1 Co(Tf2N)2 and Ni(Tf2N)2 solutions and on the metallic salts. MD simulations have been carried out to obtain structural information on the metal ion coordination. The analysis of the extended X-ray absorption fine structure (EXAFS) spectra of the solutions has been carried out based on the atomistic description provided by MD, and the studied ILs have been found to be able to dissolve both the Co(Tf2N)2 and Ni(Tf2N)2 salts giving rise to a different structural arrangement around the metal ions as compared to the solid state. The combined EXAFS and MD results showed that the Co2+ and Ni2+ ions are surrounded by a first solvation shell formed by six [Tf2N]- anions, each coordinating in a monodentate fashion by means of the oxygen atoms. The nature of the IL organic cation has little or no influence on the overall spatial arrangement of the [Tf2N]- anions, so that stable octahedral complexes of the type [M(Tf2N)6]4- (M = Co, Ni) have been observed in all the investigated ILs.
Collapse
Affiliation(s)
- Matteo Busato
- Dipartimento
di Chimica, Università di Roma “La
Sapienza”, Piazzale Aldo Moro 5, 00185 Roma, Italy
- DPIA,
Laboratorio di Scienze e Tecnologie Chimiche, Università di Udine, Via del Cotonificio 108, 33100 Udine, Italy
| | - Andrea Lapi
- Dipartimento
di Chimica, Università di Roma “La
Sapienza”, Piazzale Aldo Moro 5, 00185 Roma, Italy
| | - Paola D’Angelo
- Dipartimento
di Chimica, Università di Roma “La
Sapienza”, Piazzale Aldo Moro 5, 00185 Roma, Italy
| | - Andrea Melchior
- DPIA,
Laboratorio di Scienze e Tecnologie Chimiche, Università di Udine, Via del Cotonificio 108, 33100 Udine, Italy
| |
Collapse
|
10
|
|
11
|
Busato M, Migliorati V, Del Giudice A, Di Lisio V, Tomai P, Gentili A, D'Angelo P. Anatomy of a deep eutectic solvent: structural properties of choline chloride : sesamol 1 : 3 compared to reline. Phys Chem Chem Phys 2021; 23:11746-11754. [PMID: 33982713 DOI: 10.1039/d1cp01105g] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The structural properties of the deep eutectic solvent (DES) formed by choline chloride (ChCl) and sesamol in 1 : 3 ratio have been investigated and compared to those of reline (ChCl : urea 1 : 2). An integrated approach combining small and wide angle X-ray scattering with molecular dynamics simulations has been employed and the simulation protocol has been validated against the experimental data. In the ChCl : sesamol DES, strong hydrogen bonds (HBs) are formed between the chloride anion and the hydroxyl groups of the choline and of sesamol molecules. Conversely, choline-choline, choline-sesamol and sesamol-sesamol interactions are negligible. A more extended interplay between the constituents is observed in reline where, besides the HBs involving the chloride anion, the eutectic formation is favored also by strong choline-urea and urea-urea interactions. The three-dimensional arrangement around the individual components shows that, in the ChCl : sesamol DES, the cholinium cations and the sesamol molecules are packed in such a way to maximize the interactions with the chlorine anion. This structural arrangement may favor the π-π interactions between the sesamol molecules and the aromatic species mediated by the chloride ions, providing an interpretation for the high separation rates previously observed for phenolic DESs towards aromatic compounds.
Collapse
Affiliation(s)
- Matteo Busato
- Department of Chemistry, University "La Sapienza", P.le A. Moro 5, 00185, Rome, Italy.
| | - Valentina Migliorati
- Department of Chemistry, University "La Sapienza", P.le A. Moro 5, 00185, Rome, Italy.
| | | | - Valerio Di Lisio
- Department of Chemistry, University "La Sapienza", P.le A. Moro 5, 00185, Rome, Italy.
| | - Pierpaolo Tomai
- Department of Chemistry, University "La Sapienza", P.le A. Moro 5, 00185, Rome, Italy.
| | - Alessandra Gentili
- Department of Chemistry, University "La Sapienza", P.le A. Moro 5, 00185, Rome, Italy.
| | - Paola D'Angelo
- Department of Chemistry, University "La Sapienza", P.le A. Moro 5, 00185, Rome, Italy.
| |
Collapse
|
12
|
Dissolution and Interaction of Cellulose Carbamate in NaOH/ZnO Aqueous Solutions. Polymers (Basel) 2021; 13:polym13071092. [PMID: 33808408 PMCID: PMC8037852 DOI: 10.3390/polym13071092] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Revised: 03/28/2021] [Accepted: 03/28/2021] [Indexed: 12/03/2022] Open
Abstract
The dissolution and molecular interactions of cellulose carbamate (CC) in NaOH/ZnO aqueous solutions were studied using optical microscopy, differential scanning calorimetry (DSC), 1H NMR, dynamic light scattering (DLS), atomic force microscopy (AFM), transmission electron microscopy (TEM), and molecular dynamic simulation. The dissolution of CC in NaOH/ZnO aqueous solutions using the freezing–thawing method was an exothermic process, and the lower temperature was favorable for the dissolution of CC. ZnO dissolved in NaOH aqueous solutions with the formation of Zn(OH)42−, and no free Zn2+ ions existed in the solvents. NaOH/Na2Zn(OH)4 system formed strong interactions with the hydroxyl groups of CC to improve its solubility and the stability of CC solution. The results indicate that 7 wt% NaOH/1.6 wt% ZnO aqueous solution was the most appropriate solvent for the dissolution of CC. This work revealed the dissolution interaction of CC-NaOH/ZnO solutions, which is beneficial for the industrialization of the CarbaCell process.
Collapse
|
13
|
Rodríguez-Fernández CD, Montes-Campos H, López-Lago E, de la Fuente R, Varela LM. Microstructure, dynamics and optical properties of metal-doped imidazolium-based ionic liquids. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.113866] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
|
14
|
Busato M, D'Angelo P, Lapi A, Tolazzi M, Melchior A. Solvation of Co2+ ion in 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ionic liquid: A molecular dynamics and X-ray absorption study. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2019.112120] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
|
15
|
Thermodynamics of complex formation in dimethylsulfoxide: The case of Co(II) complexes with nitrogen donor ligands and their O2 adducts. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2019.04.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|