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Tavani F, Frateloreto F, Del Giudice D, Capocasa G, Di Berto Mancini M, Busato M, Lanzalunga O, Di Stefano S, D'Angelo P. Coupled X-ray Absorption/UV-vis Monitoring of a Prototypical Oscillating Reaction. J Phys Chem Lett 2024; 15:7312-7319. [PMID: 38984831 DOI: 10.1021/acs.jpclett.4c01569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/11/2024]
Abstract
Oscillating reactions are among the most intriguing phenomena in chemistry, but many questions on their mechanisms still remain unanswered, due to their intrinsic complexity and to the low sensitivity of the most common spectroscopic techniques toward the reaction brominated species. In this work, we investigate the cerium ion-catalyzed Belousov-Zhabotinsky (BZ) oscillating reaction by means of time-resolved X-ray absorption spectroscopy (XAS), in combination with UV-vis spectroscopy and unsupervised machine learning, multivariate curve resolution, and kinetic analyses. Altogether, we provide new insights into the collective oscillatory behavior of the key brominated species involved in the classical BZ reaction and measure previously unreported oscillations in their concentrations through Br K-edge XAS, while simultaneously tracking the oscillatory Ce4+-to-Ce3+ transformation by coupling XAS with UV-vis spectroscopy. Our work evidences the potential of the XAS technique to investigate the mechanisms of oscillatory chemical systems whose species are often not detectable with conventional experimental methods.
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Affiliation(s)
- Francesco Tavani
- Dipartimento di Chimica, Università degli Studi di Roma La Sapienza, P.le A. Moro 5, I-00185 Rome, Italy
| | - Federico Frateloreto
- Dipartimento di Chimica, Università degli Studi di Roma La Sapienza, P.le A. Moro 5, I-00185 Rome, Italy
| | - Daniele Del Giudice
- Dipartimento di Chimica, Università degli Studi di Roma La Sapienza, P.le A. Moro 5, I-00185 Rome, Italy
| | - Giorgio Capocasa
- Dipartimento di Chimica, Università degli Studi di Roma La Sapienza, P.le A. Moro 5, I-00185 Rome, Italy
| | - Marika Di Berto Mancini
- Dipartimento di Chimica, Università degli Studi di Roma La Sapienza, P.le A. Moro 5, I-00185 Rome, Italy
| | - Matteo Busato
- Dipartimento di Chimica, Università degli Studi di Roma La Sapienza, P.le A. Moro 5, I-00185 Rome, Italy
| | - Osvaldo Lanzalunga
- Dipartimento di Chimica, Università degli Studi di Roma La Sapienza, P.le A. Moro 5, I-00185 Rome, Italy
| | - Stefano Di Stefano
- Dipartimento di Chimica, Università degli Studi di Roma La Sapienza, P.le A. Moro 5, I-00185 Rome, Italy
| | - Paola D'Angelo
- Dipartimento di Chimica, Università degli Studi di Roma La Sapienza, P.le A. Moro 5, I-00185 Rome, Italy
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2
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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
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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.
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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
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3
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Harada M, Sakai H, Fukunaga Y, Okada T. Hydration of bromide at reverse micelle interfaces studied by X-ray absorption fine structure. J Colloid Interface Sci 2021; 599:79-87. [PMID: 33933799 DOI: 10.1016/j.jcis.2021.04.070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Revised: 04/12/2021] [Accepted: 04/13/2021] [Indexed: 10/21/2022]
Abstract
Nanoconfined water exhibits various interesting properties, which are not only of fundamental importance but also of practical use. Because reverse micelles (RMs) provide versatile ways to prepare nanoconfined water, the understanding of their physicochemical properties is essential for developing efficient applications. Although the water properties in the RMs could be affected by its interaction with the RM interface, the details have not been well understood. This study focuses on the local structures of Br- in hexadecyltrimethylammonium bromide (HTAB) RMs formed in chloroform and 10% hexanol/heptane. The dependence in Br- hydration on the molar ratio of water to HTAB (w) is investigated using X-ray absorption fine structure (XAFS). These systems cover a wide range of w values (0-30) and allow us to study the impact of this parameter on the local structure of Br- at the RM interface, which comprises water, surfactant headgroups, and organic solvent components. The presence of multiple scattering paths complicates the XAFS spectra and makes it difficult to analyze them using standard fitting methods. The linear combination of the spectra corresponding to the individual scattering paths captures the molecular processes that occur at the RM interface upon increasing w. The maximum hydration number of Br- is found to be 4.5 at w > 15, suggesting that although most of the ions remain at the interface as partly hydrated ions, some of them dissociate as completely hydrated ones.
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Affiliation(s)
- Makoto Harada
- Department of Chemistry, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8551, Japan.
| | - Hinako Sakai
- Department of Chemistry, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8551, Japan
| | - Yu Fukunaga
- Department of Chemistry, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8551, Japan
| | - Tetsuo Okada
- Department of Chemistry, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8551, Japan.
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4
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Treatment of disorder effects in X-ray absorption spectra beyond the conventional approach. Radiat Phys Chem Oxf Engl 1993 2020. [DOI: 10.1016/j.radphyschem.2018.12.032] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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5
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Interpretation of the Cu K-edge EXAFS spectra of Cu3N using ab initio molecular dynamics. Radiat Phys Chem Oxf Engl 1993 2020. [DOI: 10.1016/j.radphyschem.2018.12.020] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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6
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Spezia R, Migliorati V, D’Angelo P. Response to “Comment on ‘On the development of polarizable and Lennard-Jones force fields to study hydration structure and dynamics of actinide(III) ions based on effective ionic radii’” [J. Chem. Phys. 150, 097101 (2019)]. J Chem Phys 2019; 150:097102. [DOI: 10.1063/1.5087193] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Riccardo Spezia
- LAMBE, Université d’Evry Val d’Essonne, CEA, CNRS, Université Paris Saclay, F-91025 Evry, France
| | | | - Paola D’Angelo
- Dipartimento di Chimica, Università di Roma “La Sapienza”, Roma, Italy
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7
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Migliorati V, Filipponi A, Sessa F, Lapi A, Serva A, D'Angelo P. Solvation structure of lanthanide(iii) bistriflimide salts in acetonitrile solution: a molecular dynamics simulation and EXAFS investigation. Phys Chem Chem Phys 2019; 21:13058-13069. [DOI: 10.1039/c9cp01417a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Lanthanide3+ ions in acetonitrile solutions of bistriflimide salts form 10-fold coordination complexes composed of both solvent molecules and counterions
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Affiliation(s)
| | - Adriano Filipponi
- Dipartimento di Scienze Fisiche e Chimiche
- Università degli Studi dell’Aquila, Via Vetoio
- 67100 L’Aquila
- Italy
| | - Francesco Sessa
- Dipartimento di Chimica
- Università di Roma “La Sapienza”
- 00185 Roma
- Italy
| | - Andrea Lapi
- Dipartimento di Chimica
- Università di Roma “La Sapienza”
- 00185 Roma
- Italy
- Istituto CNR di Metodologie Chimiche-IMC
| | - Alessandra Serva
- Dipartimento di Chimica
- Università di Roma “La Sapienza”
- 00185 Roma
- Italy
| | - Paola D'Angelo
- Dipartimento di Chimica
- Università di Roma “La Sapienza”
- 00185 Roma
- Italy
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8
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Interaction of the calcium ion with poly(acrylic acid) as investigated by a combination of molecular dynamics simulation and X-ray absorption spectroscopy. JOURNAL OF POLYMER RESEARCH 2015. [DOI: 10.1007/s10965-015-0895-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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9
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Kumar P, Kulkarni AD, Yashonath S. Influence of a Counterion on the Ion Atmosphere of an Anion: A Molecular Dynamics Study of LiX and CsX (X = F–, Cl–, I–) in Methanol. J Phys Chem B 2015; 119:10921-33. [DOI: 10.1021/acs.jpcb.5b00481] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Parveen Kumar
- Solid
State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India
| | - Anant D. Kulkarni
- Centre
for Computational Materials Science, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore 560064, India
| | - S. Yashonath
- Solid
State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India
- Center
for Condensed Matter Theory, Indian Institute of Science, Bangalore 560012, India
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10
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Bogatko S, Cauët E, Geerlings P, De Proft F. On the coupling of solvent characteristics to the electronic structure of solute molecules. Phys Chem Chem Phys 2014; 16:3807-14. [PMID: 24435016 DOI: 10.1039/c3cp54944e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
We present the results of a theoretical investigation focusing on the solvent structure surrounding the -1, 0 and +1 charged species of F, Cl, Br and I halogen atoms and F2, Cl2, Br2 and I2 di-halogen molecules in a methanol solvent and its influence on the electronic structure of the solute molecules. Our results show a large stabilizing effect arising from the solute-solvent interactions. Well-formed first solvation shells are observed for all species, the structure of which is strongly influenced by the charge of the solute species. Detailed analysis reveals that coordination number, CN, solvent orientation, θ, and solute-solvent distance, d, are important structural characteristics which are coupled to changes in the electronic structure of the solute. We propose that the fundamental chemistry of any solute species is generally regulated by these solvent degrees of freedom.
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Affiliation(s)
- Stuart Bogatko
- Eenheid Algemene Chemie, Vrije Universiteit Brussel (VUB), Faculteit Wetenschappen, Pleinlaan 2, 1050 Brussels, Belgium.
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11
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Kumar P, Varanasi SR, Yashonath S. Relation Between the Diffusivity, Viscosity, and Ionic Radius of LiCl in Water, Methanol, and Ethylene Glycol: A Molecular Dynamics Simulation. J Phys Chem B 2013; 117:8196-208. [DOI: 10.1021/jp4036919] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Parveen Kumar
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012 India
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12
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Zitolo A, Chillemi G, D’Angelo P. X-ray Absorption Study of the Solvation Structure of Cu2+ in Methanol and Dimethyl Sulfoxide. Inorg Chem 2012; 51:8827-33. [DOI: 10.1021/ic3006647] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Andrea Zitolo
- Dipartimento di
Chimica, Universit̀a di Roma “La Sapienza”, Piazzale A. Moro 5, 00185 Roma, Italy
| | - Giovanni Chillemi
- CASPUR, Inter-University Consortium for Supercomputing in Research, via dei Tizii
6b, 00185 Roma, Italy
| | - Paola D’Angelo
- Dipartimento di
Chimica, Universit̀a di Roma “La Sapienza”, Piazzale A. Moro 5, 00185 Roma, Italy
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13
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D’Angelo P, Zitolo A, Ceccacci F, Caminiti R, Aquilanti G. Structural characterization of zinc(II) chloride in aqueous solution and in the protic ionic liquid ethyl ammonium nitrate by x-ray absorption spectroscopy. J Chem Phys 2011; 135:154509. [DOI: 10.1063/1.3653939] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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14
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D’Angelo P, Zitolo A, Migliorati V, Bodo E, Aquilanti G, Hazemann JL, Testemale D, Mancini G, Caminiti R. X-Ray absorption spectroscopy investigation of 1-alkyl-3-methylimidazolium bromide salts. J Chem Phys 2011; 135:074505. [DOI: 10.1063/1.3625920] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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15
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D’Angelo P, Zitolo A, Migliorati V, Chillemi G, Duvail M, Vitorge P, Abadie S, Spezia R. Revised Ionic Radii of Lanthanoid(III) Ions in Aqueous Solution. Inorg Chem 2011; 50:4572-9. [DOI: 10.1021/ic200260r] [Citation(s) in RCA: 175] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Paola D’Angelo
- Department of Chemistry, University of Rome “La Sapienza”, P. le A. Moro 5, 00185 Roma, Italy
| | - Andrea Zitolo
- Department of Chemistry, University of Rome “La Sapienza”, P. le A. Moro 5, 00185 Roma, Italy
| | - Valentina Migliorati
- Department of Chemistry, University of Rome “La Sapienza”, P. le A. Moro 5, 00185 Roma, Italy
| | - Giovanni Chillemi
- CASPUR, Inter-University Consortium for Supercomputing in Research, via dei Tizii 6b, 00185 Roma, Italy
| | - Magali Duvail
- Laboratoire Analyse et Modelisation pour la Biologie et l′Environnement, UMR 8587 CNRS-CEA-UEVE, Université d’Evry Val d’Essonne, Bd F. Mitterrand, 91025 Evry Cedex, France
| | - Pierre Vitorge
- Laboratoire Analyse et Modelisation pour la Biologie et l′Environnement, UMR 8587 CNRS-CEA-UEVE, Université d’Evry Val d’Essonne, Bd F. Mitterrand, 91025 Evry Cedex, France
- Laboratoire de Speciation des Radionucleides et des Molecules, CEA, DEN, F-91191 Gif-sur-Yvette, France
| | - Sacha Abadie
- Department of Chemistry, University of Rome “La Sapienza”, P. le A. Moro 5, 00185 Roma, Italy
- Laboratoire Analyse et Modelisation pour la Biologie et l′Environnement, UMR 8587 CNRS-CEA-UEVE, Université d’Evry Val d’Essonne, Bd F. Mitterrand, 91025 Evry Cedex, France
| | - Riccardo Spezia
- Laboratoire Analyse et Modelisation pour la Biologie et l′Environnement, UMR 8587 CNRS-CEA-UEVE, Université d’Evry Val d’Essonne, Bd F. Mitterrand, 91025 Evry Cedex, France
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16
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Fulton JL, Balasubramanian M. Structure of Hydronium (H3O+)/Chloride (Cl−) Contact Ion Pairs in Aqueous Hydrochloric Acid Solution: A Zundel-like Local Configuration. J Am Chem Soc 2010; 132:12597-604. [DOI: 10.1021/ja1014458] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- John L. Fulton
- Chemical and Materials Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99354, and Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439
| | - Mahalingam Balasubramanian
- Chemical and Materials Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99354, and Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439
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17
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A theoretical study of the hydration of Rb+ by Monte Carlo simulations with refined ab initio-based model potentials. Theor Chem Acc 2009. [DOI: 10.1007/s00214-009-0644-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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18
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Chan SJ, Howe AG, Hook JM, Harper JB. (79)Br NMR spectroscopy as a practical tool for kinetic analysis. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2009; 47:342-347. [PMID: 19189283 DOI: 10.1002/mrc.2401] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
(79)Br NMR spectroscopy has been used to monitor a series of reactions in which the bromide ion is produced, including the Menschutkin reaction of pyridine with a range of substituted benzyl bromides and a Heck coupling process. In cases where the process could also be monitored using (1)H NMR spectroscopy, the kinetic analyses using heteronuclear magnetic resonance spectroscopy were shown to be completely consistent. Both the utility of the process in following reactions which may be difficult to analyse using other techniques and the practical limitations associated with solvent choice are discussed.
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Affiliation(s)
- Si Jia Chan
- School of Chemistry, University of New South Wales, Sydney NSW 2052, Australia
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19
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Dang LX, Schenter GK, Glezakou VA, Fulton JL. Molecular Simulation Analysis and X-ray Absorption Measurement of Ca2+, K+and Cl-Ions in Solution. J Phys Chem B 2006; 110:23644-54. [PMID: 17125322 DOI: 10.1021/jp064661f] [Citation(s) in RCA: 104] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This paper presents recent advances in the use of molecular simulations and extended X-ray absorption fine structure (EXAFS) spectroscopy, which enable us to understand solvated ions in solution. We report and discuss the EXAFS spectra and related properties governing solvation processes of different ions in water and methanol. Molecular dynamics (MD) trajectories are coupled to electron scattering simulations to generate the MD-EXAFS spectra, which are found to be in very good agreement with the corresponding experimental measurements. From these simulated spectra, the ion-oxygen distances for the first hydration shell are in agreement with experiment within 0.05-0.1 A. The ionic species studied range from monovalent to divalent, positive and negative: K+, Ca2+, and Cl-. This work demonstrates that the combination of MD-EXAFS and the corresponding experimental measurement provides a powerful tool in the analysis of the solvation structure of aqueous ionic solutions. We also investigate the value of electronic structure analysis of small aqueous clusters as a benchmark to the empirical potentials. In a novel computational approach, we determine the Debye-Waller factors for Ca2+, K+, and Cl- in water by combining the harmonic analysis of data obtained from electronic structure calculations on finite ion-water clusters, providing excellent agreement with the experimental values, and discuss how they compare with results from a harmonic classical statistical mechanical analysis of an empirical potential.
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Affiliation(s)
- Liem X Dang
- Chemical Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99352, USA
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20
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D'Angelo P, Roscioni OM, Chillemi G, Della Longa S, Benfatto M. Detection of Second Hydration Shells in Ionic Solutions by XANES: Computed Spectra for Ni2+ in Water Based on Molecular Dynamics. J Am Chem Soc 2006; 128:1853-8. [PMID: 16464084 DOI: 10.1021/ja0562503] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A general procedure to compute X-ray absorption near-edge structure (XANES) spectra within multiple-scattering theory starting from molecular dynamics (MD) structural data has been developed and applied to the study of a Ni(2+) aqueous solution. This method allows one to perform a quantitative analysis of the XANES spectra of disordered systems using a proper description of the thermal and structural fluctuations. The XANES spectrum of Ni(2+) in aqueous solution has been calculated using the structural information obtained from the MD simulations without carrying out any minimization in the structural parameter space. A very good reproduction of the experimental data was obtained including the second-shell water molecules in the calculation, thus showing that the second hydration shell provides a detectable contribution to the XANES spectra of ionic solutions. The analysis including the first-shell cluster only permitted us to quantitatively determine the effect of disorder on the amplitude of the XANES spectra for molecular complexes. These results simultaneously confirm the reliability of the procedure and the structural results obtained from MD simulations. The combination of MD and XANES is found to be very helpful to get important new insights into the quantitative estimation of structural properties of disordered systems.
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Affiliation(s)
- Paola D'Angelo
- Dipartimento di Chimica, Università di Roma La Sapienza, Piazzale A. Moro 5, 00185 Rome, Italy.
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21
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Testemale D, Hazemann JL, Pokrovski GS, Joly Y, Roux J, Argoud R, Geaymond O. Structural and electronic evolution of the As(OH)3 molecule in high temperature aqueous solutions: An x-ray absorption investigation. J Chem Phys 2004; 121:8973-82. [PMID: 15527363 DOI: 10.1063/1.1785150] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The geometrical and electronic structure of the arsenious acid molecule As(OH)(3) in aqueous solutions has been investigated by x-ray absorption spectroscopy (XAS) within extended x-ray absorption spectroscopy (EXAFS) and x-ray absorption near edge structure (XANES), using realistic first-principle calculations in the latter case. This investigation was performed on aqueous solutions of arsenious acid from ambient to supercritical conditions (P = 250 and 600 bars, T <or= 500 degrees C) using a new optical cell. The analysis of the XAS spectra is consistent with (1) a constant As-O distance, (2) an opening of the O-As-O angles within the C(3V) pyramidal structure in the range 30-200 degrees C. This structural evolution comes along with a small decrease of the partial charges of the atoms in the As(OH)(3) molecule. The explanation invoked for both structural and electronic modifications observed is the weakening of the interactions, through hydrogen bonds, between the As(OH)(3) complex and water molecules. This is a fingerprint of the similar weakening of hydrogen bonding interactions in the solvent itself.
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Affiliation(s)
- Denis Testemale
- Laboratoire de Cristallographie CNRS-Grenoble, UPR5031, 25 avenue des Martyrs, BP 166 38042 Grenoble Cedex 09, France.
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22
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D'Angelo P, Petit PE, Pavel NV. Double-Electron Excitation Channels at the Ca2+ K-Edge of Hydrated Calcium Ion. J Phys Chem B 2004. [DOI: 10.1021/jp048511l] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Paola D'Angelo
- Dipartimento di Chimica, Università di Roma “La Sapienza”, P.O. Box 34 - Roma 62, Pzz.le A. Moro 5, I-00185 Roma, Italy, INFM UdF Camerino, Italy, and ESRF, BP 220, F-38043 Grenoble Cedex, France
| | - Pierre-Emmanuel Petit
- Dipartimento di Chimica, Università di Roma “La Sapienza”, P.O. Box 34 - Roma 62, Pzz.le A. Moro 5, I-00185 Roma, Italy, INFM UdF Camerino, Italy, and ESRF, BP 220, F-38043 Grenoble Cedex, France
| | - Nicolae Viorel Pavel
- Dipartimento di Chimica, Università di Roma “La Sapienza”, P.O. Box 34 - Roma 62, Pzz.le A. Moro 5, I-00185 Roma, Italy, INFM UdF Camerino, Italy, and ESRF, BP 220, F-38043 Grenoble Cedex, France
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Merkling PJ, Ayala R, Martı́nez JM, Pappalardo RR, Sánchez Marcos E. Interplay of computer simulations and x-ray absorption spectra in the study of the bromide hydration structure. J Chem Phys 2003. [DOI: 10.1063/1.1603719] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Tanida H, Kato KI, Watanabe I. Hydrogen Atom Position in Hydrated Iodide Anion from X-ray Absorption Near Edge Structure. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2003. [DOI: 10.1246/bcsj.76.1735] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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Ayala R, Martı́nez JM, Pappalardo RR, Saint-Martı́n H, Ortega-Blake I, Sánchez Marcos E. Development of first-principles interaction model potentials. An application to the study of the bromide hydration. J Chem Phys 2002. [DOI: 10.1063/1.1519843] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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D'Angelo P, Barone V, Chillemi G, Sanna N, Meyer-Klaucke W, Pavel NV. Hydrogen and higher shell contributions in Zn2+, Ni2+, and Co2+ aqueous solutions: an X-ray absorption fine structure and molecular dynamics study. J Am Chem Soc 2002; 124:1958-67. [PMID: 11866609 DOI: 10.1021/ja015685x] [Citation(s) in RCA: 155] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A detailed investigation of the hydration structure of Zn2+, Ni2+, and Co2+ in water solutions has been carried out combining X-ray absorption fine structure (EXAFS) spectroscopy and Molecular Dynamics (MD) simulations. The first quantitative analysis of EXAFS from hydrogen atoms in 3d transition metal ions in aqueous solutions has been carried out and the ion-hydrogen interactions have been found to provide a detectable contribution to the EXAFS spectra. An accurate determination of the structural parameters associated with the first hydration shell has been performed and compared with previous experimental results. No evidence of significant contributions from the second hydration shell to the EXAFS signal has been found for these solutions, while the inclusion of the hydrogen signal has been found to be important in performing a quantitative analysis of the experimental data. The high-frequency contribution present in the EXAFS spectra has been found to be due to multiple scattering (MS) effects inside the ion-oxygen first coordination shell. MD has been used to generate three-body distribution functions from which a reliable analysis of the MS contributions to the EXAFS spectra of these systems has been carried out.
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Affiliation(s)
- Paola D'Angelo
- Dipartimento di Chimica, Università di Roma La Sapienza, P. le A. Moro 5, 00185 Roma, Italy
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Simonet V, Calzavara Y, Hazemann JL, Argoud R, Geaymond O, Raoux D. Structure of aqueous ZnBr2 solution probed by x-ray absorption spectroscopy in normal and hydrothermal conditions. J Chem Phys 2002. [DOI: 10.1063/1.1433499] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Bressler C, Saes M, Chergui M, Grolimund D, Abela R, Pattison P. Towards structural dynamics in condensed chemical systems exploiting ultrafast time-resolved x-ray absorption spectroscopy. J Chem Phys 2002. [DOI: 10.1063/1.1435618] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
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D’Angelo P, Pavel NV. Evidence of three-body correlation functions in Rb+ and Sr2+ acetonitrile solutions. J Chem Phys 1999. [DOI: 10.1063/1.479767] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Roccatano D, Berendsen HJC, D’Angelo P. Assessment of the validity of intermolecular potential models used in molecular dynamics simulations by extended x-ray absorption fine structure spectroscopy: A case study of Sr2+ in methanol solution. J Chem Phys 1998. [DOI: 10.1063/1.476398] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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D'Angelo P, Pavel NV, Roccatano D, Nolting H. Multielectron excitations at the L edges of barium in aqueous solution. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:12129-12138. [PMID: 9985072 DOI: 10.1103/physrevb.54.12129] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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