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Kircheva N, Dobrev S, Nikolova V, Angelova S, Dudev T. Theoretical Insight into the Phosphate-Targeted Silver's Antibacterial Action: Differentiation between Gram (+) and Gram (-) Bacteria. Inorg Chem 2022; 61:10089-10100. [PMID: 35724666 DOI: 10.1021/acs.inorgchem.2c01085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Although silver is one of the first metals finding broad applications in everyday life, specific key points of the intimate mechanism of its bacteriostatic/bactericidal activity lack explanation. It is widely accepted that the antimicrobial potential of the silver cation depends on the composition and thickness of the bacterial external envelope: the outer membrane in Gram-negative bacteria is more prone to Ag+ attack than the cell wall in Gram-positive bacteria. The major cellular components able to interact strongly with Ag+ (teichoic acids, phospholipids, and lipopolysaccharides) contain mono/diesterified phosphate moieties. By applying a reliable DFT/SMD methodology, we modeled the reactions between the aforementioned constituents in typical Gram-positive and Gram-negative bacteria and hydrated Ag+ species, thus disclosing the factors that govern the process of metal-model ligand complexation. The conducted research indicates thermodynamically possible reactions in all cases but still a greater preference of the Ag+ toward the constituents in Gram-negative bacteria in comparison with their counterparts in Gram-positive bacteria. The observed tendencies shed light on the specific interactions of the silver cation with the modeled phosphate-containing units at the atomic level.
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Affiliation(s)
- Nikoleta Kircheva
- Institute of Optical Materials and Technologies ″Acad. J. Malinowski″, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
| | - Stefan Dobrev
- Institute of Optical Materials and Technologies ″Acad. J. Malinowski″, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
| | - Valya Nikolova
- Faculty of Chemistry and Pharmacy, Sofia University ″St. Kl. Ohridski″, 1164 Sofia, Bulgaria
| | - Silvia Angelova
- Institute of Optical Materials and Technologies ″Acad. J. Malinowski″, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
| | - Todor Dudev
- Faculty of Chemistry and Pharmacy, Sofia University ″St. Kl. Ohridski″, 1164 Sofia, Bulgaria
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Tálas E, Szőllősi G, Kristyán S, Németh C, Firkala T, Mink J, Mihály J. Surface enhanced Raman spectroscopic (SERS) behavior of phenylpyruvates used in heterogeneous catalytic asymmetric cascade reaction. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2021; 260:119912. [PMID: 34015742 DOI: 10.1016/j.saa.2021.119912] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Revised: 04/25/2021] [Accepted: 05/02/2021] [Indexed: 06/12/2023]
Abstract
The strength and geometry of adsorption of substituted phenylpyruvates on silver surface was studied by means of surface enhanced Raman spectroscopy (SERS) using silver sol. 2'-nitrophenylpyruvates were used as starting materials in a newly developed heterogeneous catalytic asymmetric cascade reaction to produce substituted quinoline derivatives. Substituents on the aromatic ring of the starting materials had significant influence on the yield of the desired quinoline derivatives. Product selectivity of the transformation of nitrophenylpyruvates were enhanced by the acid added. The geometry and the strength of the adsorption are assumed to play an important role in the outcome of this reaction, so we have tried to find correlation between the structure of adsorbed phenylpyruvates and their catalytic performance. Based on the results of our spectroscopic measurements, the enol form is predominant in the series of phenylpyruvates in solid form and methanol solutions. Stronger adsorption of phenylpyruvates in acidic media through oxygen atoms was indicated by the increased enhancement in the SERS spectrum. The nitro group of 2'-nitrophenylpyruvates has no direct role in the adsorption on Ag surface. This observation has explained why the hydrogenation of the keto group (presumably via the enol form) occurs preferentially and why the formation of the undesired indole derivatives requiring reduction of the nitro group is suppressed. The SERS behavior has helped to get a closer look on the first step of adsorption of starting materials contributing to a better understanding of the cascade reaction studied, thus providing a better flexibility in catalyst design.
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Affiliation(s)
- Emília Tálas
- Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Eötvös Loránd Research Network (ELKH), H-1117 Budapest, Magyar Tudósok körútja 2, Hungary.
| | - György Szőllősi
- MTA-SZTE Stereochemistry Research Group, H-6720 Szeged, Dóm tér 8, Hungary
| | - Sándor Kristyán
- Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Eötvös Loránd Research Network (ELKH), H-1117 Budapest, Magyar Tudósok körútja 2, Hungary
| | - Csaba Németh
- Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Eötvös Loránd Research Network (ELKH), H-1117 Budapest, Magyar Tudósok körútja 2, Hungary
| | - Tamás Firkala
- Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Eötvös Loránd Research Network (ELKH), H-1117 Budapest, Magyar Tudósok körútja 2, Hungary
| | - János Mink
- Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Eötvös Loránd Research Network (ELKH), H-1117 Budapest, Magyar Tudósok körútja 2, Hungary
| | - Judith Mihály
- Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Eötvös Loránd Research Network (ELKH), H-1117 Budapest, Magyar Tudósok körútja 2, Hungary; Department of Chemistry, Eszterházy Károly University, H-3300 Eger, Leányka u. 6, Hungary.
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Busato M, Melchior A, Migliorati V, Colella A, Persson I, Mancini G, Veclani D, D'Angelo P. Elusive Coordination of the Ag + Ion in Aqueous Solution: Evidence for a Linear Structure. Inorg Chem 2020; 59:17291-17302. [PMID: 33233885 DOI: 10.1021/acs.inorgchem.0c02494] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
X-ray absorption spectroscopy (XAS) has been employed to study the coordination of the Ag+ ion in aqueous solution. The conjunction of extended X-ray absorption fine structure (EXAFS) and X-ray absorption near-edge structure (XANES) data analysis provided results suggesting the preference for a first shell linear coordination with a mean Ag-O bond distance of 2.34(2) Å, different from the first generally accepted tetrahedral model with a longer mean Ag-O bond distance. Ab initio molecular dynamics simulations with the Car-Parrinello approach (CPMD) were also performed and were able to describe the coordination of the hydrated Ag+ ion in aqueous solution in very good agreement with the experimental data. The high sensitivity for the closest environment of the photoabsorber of the EXAFS and XANES techniques, together with the long-range information provided by CPMD and large-angle X-ray scattering (LAXS), allowed us to reconstruct the three-dimensional model of the coordination geometry around the Ag+ ion in aqueous solution. The obtained results from experiments and theoretical simulations provided a complex picture with a certain amount of water molecules with high configurational disorder at distances comprised between the first and second hydration spheres. This evidence may have caused the proliferation of the coordination numbers that have been proposed so far for Ag+ in water. Altogether these data show how the description of the hydration of the Ag+ ion in aqueous solution can be complex, differently from other metal species where hydration structures can be described by clusters with well-defined geometries. This diffuse hydration shell causes the Ag-O bond distance in the linear [Ag(H2O)2]+ ion to be ca. 0.2 Å longer than in isolated ions in solid state.
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Affiliation(s)
- Matteo Busato
- Dipartimento Politecnico di Ingegneria e Architettura (DPIA), Laboratori di Chimica, Università di Udine, via delle Scienze 99, 33100 Udine, Italy.,Dipartimento di Chimica, Università di Roma "La Sapienza", P.le A. Moro 5, 00185 Roma, Italy
| | - Andrea Melchior
- Dipartimento Politecnico di Ingegneria e Architettura (DPIA), Laboratori di Chimica, Università di Udine, via delle Scienze 99, 33100 Udine, Italy
| | - Valentina Migliorati
- Dipartimento di Chimica, Università di Roma "La Sapienza", P.le A. Moro 5, 00185 Roma, Italy
| | - Andrea Colella
- Dipartimento di Chimica, Università di Roma "La Sapienza", P.le A. Moro 5, 00185 Roma, Italy
| | - Ingmar Persson
- Department of Molecular Sciences, Swedish University of Agricultural Sciences (SLU), SE-750 07 Uppsala, Sweden
| | - Giordano Mancini
- Centro HPC, Scuola Normale Superiore, Piazza San Silvestro 12, 56125 Pisa, Italy
| | - Daniele Veclani
- Dipartimento Politecnico di Ingegneria e Architettura (DPIA), Laboratori di Chimica, Università di Udine, via delle Scienze 99, 33100 Udine, Italy
| | - Paola D'Angelo
- Dipartimento di Chimica, Università di Roma "La Sapienza", P.le A. Moro 5, 00185 Roma, Italy
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Mistry L, Waddell PG, Wright NG, Horrocks BR, Houlton A. transoid and cisoid Conformations in Silver-Mediated Cytosine Base Pairs: Hydrogen Bonding Dictates Argentophilic Interactions in the Solid State. Inorg Chem 2019; 58:13346-13352. [DOI: 10.1021/acs.inorgchem.9b02228] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Liam Mistry
- Chemical Nanoscience Laboratory, Chemistry, School of Natural & Environmental Sciences, Newcastle University, Newcastle upon Tyne, NE1 7RU, U.K
| | - Paul G. Waddell
- Chemical Nanoscience Laboratory, Chemistry, School of Natural & Environmental Sciences, Newcastle University, Newcastle upon Tyne, NE1 7RU, U.K
| | - Nick G. Wright
- School of Engineering, Newcastle University, Newcastle upon Tyne, NE1 7RU, U.K
| | - Benjamin R. Horrocks
- Chemical Nanoscience Laboratory, Chemistry, School of Natural & Environmental Sciences, Newcastle University, Newcastle upon Tyne, NE1 7RU, U.K
| | - Andrew Houlton
- Chemical Nanoscience Laboratory, Chemistry, School of Natural & Environmental Sciences, Newcastle University, Newcastle upon Tyne, NE1 7RU, U.K
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5
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Collins KD. Why continuum electrostatics theories cannot explain biological structure, polyelectrolytes or ionic strength effects in ion–protein interactions. Biophys Chem 2012; 167:43-59. [DOI: 10.1016/j.bpc.2012.04.002] [Citation(s) in RCA: 169] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2011] [Revised: 04/10/2012] [Accepted: 04/10/2012] [Indexed: 01/13/2023]
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Novel structural variation of silver(I)–pyridine complexes in nitromethane as studied by X-ray absorption spectroscopy. Inorganica Chim Acta 2011. [DOI: 10.1016/j.ica.2011.08.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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7
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Mason PE, Neilson GW, Dempsey CE, Price DL, Saboungi ML, Brady JW. Observation of pyridine aggregation in aqueous solution using neutron scattering experiments and MD simulations. J Phys Chem B 2010; 114:5412-9. [PMID: 20369858 DOI: 10.1021/jp9097827] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Neutron diffraction with isotopic substitution (NDIS) experiments have been used to examine the structuring of aqueous solutions of pyridine. A new method is described for extracting the structure factors relating to intermolecular correlations from neutron scattering experiments on liquid solutions of complex molecular species. This approach performs experiments at different concentrations and exploits the intramolecular coordination number concentration invariance (ICNCI) to separate the internal and intermolecular contributions to the total intensities. The ability of this method to deconvolute molecular and intermolecular correlations is tested and demonstrated using simulated neutron scattering results predicted from molecular dynamics simulations of aqueous solutions of the polyatomic solute pyridine in which the inter- and intramolecular terms are known. The method is then implemented using neutron scattering measurements on solutions of pyridine. The results confirm that pyridine shows a significant propensity to aggregate in solution and demonstrate the prospects for the future application of the ICNCI approach to the study of large polyatomic solutes using next-generation neutron sources and detectors.
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Affiliation(s)
- Philip E Mason
- Department of Food Science, Stocking Hall, Cornell University, Ithaca, New York 14853, USA
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8
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Furukawa K, Ohashi K, Imamura T, Sasaki J, Judai K, Nishi N, Sekiya H. Methanol solvation of the Ag+ ion probed with infrared photodissociation spectroscopy of Ag+(CH3OH) (n= 1–5). Chem Phys Lett 2010. [DOI: 10.1016/j.cplett.2010.06.043] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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9
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Fulton JL, Kathmann SM, Schenter GK, Balasubramanian M. Hydrated Structure of Ag(I) Ion from Symmetry-Dependent, K- and L-Edge XAFS Multiple Scattering and Molecular Dynamics Simulations. J Phys Chem A 2009; 113:13976-84. [DOI: 10.1021/jp9064906] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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
| | - Shawn M. Kathmann
- Chemical and Materials Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99354, and Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439
| | - Gregory K. Schenter
- 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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10
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Leung K, Rempe SB, von Lilienfeld OA. Ab initio molecular dynamics calculations of ion hydration free energies. J Chem Phys 2009; 130:204507. [PMID: 19485457 PMCID: PMC2736677 DOI: 10.1063/1.3137054] [Citation(s) in RCA: 108] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2009] [Accepted: 04/25/2009] [Indexed: 11/14/2022] Open
Abstract
We apply ab initio molecular dynamics (AIMD) methods in conjunction with the thermodynamic integration or "lambda-path" technique to compute the intrinsic hydration free energies of Li(+), Cl(-), and Ag(+) ions. Using the Perdew-Burke-Ernzerhof functional, adapting methods developed for classical force field applications, and with consistent assumptions about surface potential (phi) contributions, we obtain absolute AIMD hydration free energies (DeltaG(hyd)) within a few kcal/mol, or better than 4%, of Tissandier et al.'s [J. Phys. Chem. A 102, 7787 (1998)] experimental values augmented with the SPC/E water model phi predictions. The sums of Li(+)/Cl(-) and Ag(+)/Cl(-) AIMD DeltaG(hyd), which are not affected by surface potentials, are within 2.6% and 1.2 % of experimental values, respectively. We also report the free energy changes associated with the transition metal ion redox reaction Ag(+)+Ni(+)-->Ag+Ni(2+) in water. The predictions for this reaction suggest that existing estimates of DeltaG(hyd) for unstable radiolysis intermediates such as Ni(+) may need to be extensively revised.
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Affiliation(s)
- Kevin Leung
- Department of Surface and Interface Sciences, MS 1415, Sandia National Laboratories, Albuquerque, New Mexico 87185, USA.
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11
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Collins KD, Neilson GW, Enderby JE. Ions in water: Characterizing the forces that control chemical processes and biological structure. Biophys Chem 2007; 128:95-104. [PMID: 17418479 DOI: 10.1016/j.bpc.2007.03.009] [Citation(s) in RCA: 433] [Impact Index Per Article: 25.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2007] [Revised: 03/09/2007] [Accepted: 03/10/2007] [Indexed: 11/29/2022]
Abstract
The continuum electrostatics model of Debye and Hückel [P. Debye and E. Hückel, On the theory of electrolytes. I. Freezing point depression and related phenomena., Phys. Z. 24 (1923) 185-206.] and its successors utilize a macroscopic dielectric constant and assume that all interactions involving ions are strictly electrostatic, implying that simple ions in water generate electric fields strong enough to orient water dipoles over long distances. However, solution neutron and X-ray diffraction indicate that even di- and tri-valent ions do not significantly alter the density or orientation of water more than two water molecules (5 A) away. Therefore the long range electric fields (generated by simple ions) which can be detected by various resonance techniques such as fluorescence resonance energy transfer over distances of 30 A (about 11 water diameters) or more must be weak relative to the strength of water-water interactions. Two different techniques indicate that the interaction of water with anions is by an approximately linear hydrogen bond, suggesting that the dominant forces on ions in water are short range forces of a chemical nature.
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Affiliation(s)
- Kim D Collins
- Center of Marine Biotechnology and Medical Biotechnology Center, University of Maryland Biotechnology Institute, Baltimore, MD 21201, USA.
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12
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Persson I, Nilsson KB. Coordination Chemistry of the Solvated Silver(I) Ion in the Oxygen Donor Solvents Water, Dimethyl Sulfoxide, and N,N‘-Dimethylpropyleneurea. Inorg Chem 2006; 45:7428-34. [PMID: 16933947 DOI: 10.1021/ic060636c] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The hydrated and dimethyl sulfoxide and N,N'-dimethylpropyleneurea solvated silver(I) ions have been characterized structurally in solution by means of extended X-ray absorption fine structure (EXAFS) and large-angle X-ray scattering (LAXS). The coordination chemistry of the hydrated and dimethyl sulfoxide solvated silver(I) ions has been reevaluated because of different results from the EXAFS and LAXS methods reported previously. Consistent results are obtained with a linearly distorted tetrahedral model with two short and approximately two long Ag-O bond distances: mean Ag-O bond lengths of 2.32(1) and 2.54(1) A for the hydrate, 2.31(1) and 2.48(2) A for the dimethyl sulfoxide solvate, and 2.31(1) and 2.54(2) A for the N,N'-dimethylpropyleneurea solvate, in solution.
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Affiliation(s)
- Ingmar Persson
- Department of Chemistry, Swedish University of Agricultural Sciences, P.O. Box 7015, SE-750 07 Uppsala, Sweden.
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Armunanto R, Schwenk CF, Rode BM. Ab Initio QM/MM Simulation of Ag+in 18.6% Aqueous Ammonia Solution: Structure and Dynamics Investigations. J Phys Chem A 2005; 109:4437-41. [PMID: 16833778 DOI: 10.1021/jp0462916] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Structure and dynamics investigations of Ag(+) in 18.6% aqueous ammonia solution have been carried out by means of the ab initio quantum mechanical/molecular mechanical (QM/MM) molecular dynamics (MD) simulation method. The most important region, the first solvation shell, was treated by ab initio quantum mechanics at the Restricted Hartree-Fock (RHF) level using double-zeta plus polarization basis sets for ammonia and plus ECP for Ag(+). For the remaining region in the system, newly constructed three-body corrected potential functions were used. The average composition of the first solvation shell was found to be [Ag(NH(3))(2)(H(2)O)(2.8)](+). No ammonia exchange process was observed for the first solvation shell, whereas ligand exchange processes occurred with a very short mean residence time of 1.1 ps for the water ligands. No distinct second solvation shell was observed in this simulation.
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Affiliation(s)
- Ria Armunanto
- Department of Theoretical Chemistry, Institute of General, Inorganic, and Theoretical Chemistry, University of Innsbruck, Innrain 52a, A-6020 Innsbruck, Austria
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Bernasconi L, Blumberger J, Sprik M, Vuilleumier R. Density functional calculation of the electronic absorption spectrum of Cu+ and Ag+ aqua ions. J Chem Phys 2004; 121:11885-99. [PMID: 15634150 DOI: 10.1063/1.1818676] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The UV absorption of aqueous Cu+ and Ag+ has been studied using Time Dependent Density Functional Theory (TDDFT) response techniques. The TDDFT electronic spectrum was computed from finite temperature dynamical trajectories in solution generated using the Density Functional Theory (DFT) based Ab Initio Molecular Dynamics (AIMD) method. The absorption of the two ions is shown to arise from similar excitation mechanisms, namely transitions from d orbitals localized on the metal center to a rather delocalized state originating from hybridization of the metal s orbital to the conduction band edge of the solvent. The ions differ in the way the spectral profile builds up as a consequence of solvent thermal motion. The Cu+ absorption is widely modulated, both in transition energies and intensities by fluctuations in the coordination environment which is characterized by the formation of strong coordination bonds to two water molecules in an approximately linear geometry. Though, on average, absorption intensities are typical of symmetry forbidden transitions of metal ions in the solid state, occasionally very short (<100 fs) bursts in intensity are observed, associated with anomalous Cu-H interactions. Absorption by the Ag+ complex is in comparison relatively stable in time, and can be interpreted in terms of the energy splitting of the metal 4d manifold in an average crystal field corresponding to a fourfold coordination in a distorted tetrahedral arrangement. Whereas the spectral profile of the Ag+ aqua ion is in good agreement with experiment, the overall position of the band is underestimated by 2 eV in the BLYP approximation to DFT. The discrepancy with experiment is reduced to 1.3 eV when a hybrid functional (PBE0) is used. The remaining inaccuracy of TDDFT in this situation is related to the delocalized character of the target state in d-->s transitions.
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Affiliation(s)
- Leonardo Bernasconi
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
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Blumberger J, Bernasconi L, Tavernelli I, Vuilleumier R, Sprik M. Electronic structure and solvation of copper and silver ions: a theoretical picture of a model aqueous redox reaction. J Am Chem Soc 2004; 126:3928-38. [PMID: 15038747 DOI: 10.1021/ja0390754] [Citation(s) in RCA: 181] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Electronic states and solvation of Cu and Ag aqua ions are investigated by comparing the Cu(2+) + e(-)--> Cu(+) and Ag(2+) + e(-)--> Ag(+) redox reactions using density functional-based computational methods. The coordination number of aqueous Cu(2+) is found to fluctuate between 5 and 6 and reduces to 2 for Cu(+), which forms a tightly bound linear dihydrate. Reduction of Ag(2+) changes the coordination number from 5 to 4. The energetics of the oxidation reactions is analyzed by comparing vertical ionization potentials, relaxation energies, and vertical electron affinities. The model is validated by a computation of the free energy of the full redox reaction Ag(2+) + Cu(+) --> Ag(+) + Cu(2+). Investigation of the one-electron states shows that the redox active frontier orbitals are confined to the energy gap between occupied and empty states of the pure solvent and localized on the metal ion hydration complex. The effect of solvent fluctuations on the electronic states is highlighted in a computation of the UV absorption spectrum of Cu(+) and Ag(+).
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Affiliation(s)
- Jochen Blumberger
- Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, United Kingdom
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17
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Blumberger J, Sprik M. Free Energy of Oxidation of Metal Aqua Ions by an Enforced Change of Coordination. J Phys Chem B 2004. [DOI: 10.1021/jp036610d] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jochen Blumberger
- University Chemical Laboratory, Lensfield Road, Cambridge CB2 1EW, United Kingdom
| | - Michiel Sprik
- University Chemical Laboratory, Lensfield Road, Cambridge CB2 1EW, United Kingdom
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Abstract
While in pure solvents Ag(+) is known to be tetrahedrally coordinated, in the presence of ligands such as ammonia it forms linear complexes, usually explained by the ion's tendency toward sd-hybridization. To explore this disparity, we have investigated the reaction of ammoniated silver cations Ag(+)(NH(3))(n)(), n = 11-23, with H(2)O as well as the complementary process, the reaction of Ag(+)(H(2)O)(n)(), n = 25-45, with NH(3) by means of FT-ICR mass spectrometry. In both cases, ligand exchange reactions take place, leading to clusters with a limited number of NH(3) ligands. The former reaction proceeds very rapidly until only three NH(3) ligands are left, followed by a much slower loss of an additional ligand to form Ag(+)(NH(3))(2)(H(2)O)(m)() clusters. In the complementary process, the reaction of Ag(+)(H(2)O)(n)() with NH(3) five ammonia ligands are very rapidly taken up by the clusters, with a much less efficient uptake of a sixth one. The accompanying DFT calculations reveal a delicate balance between competing effects where not only the preference of Ag(+) for sd-hybridization, but also its ability to polarize the ligands and thus affect the strength of their hydrogen bonding, as well as the ability of the solvent to form extended hydrogen-bonded networks are important.
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Affiliation(s)
- Brigitte S Fox
- Institut für Physikalische und Theoretische Chemie, Technische Universität München, Lichtenbergstrasse 4, 85747 Garching, Germany
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Stålhandske CM, Stålhandske CI, Persson I, Sandström M, Jalilehvand F. Crystal and solution structures of N,N-dimethylthioformamide-solvated copper(I), silver(I), and gold(I) ions studied by X-ray diffraction, X-ray absorption, and vibrational spectroscopy. Inorg Chem 2001; 40:6684-93. [PMID: 11735479 DOI: 10.1021/ic010226i] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Crystal structures of the solvated copper(I) and silver(I) perchlorate salts crystallizing from N,N-dimethylthioformamide solution have been determined by single-crystal X-ray diffraction at 295 K. Tetrakis(N,N-dimethylthioformamide)copper(I) perchlorate, [Cu(SCHN(CH(3))(2))(4)]ClO(4), crystallizes in the monoclinic space group P2/n (No. 13) with a = 8.428(2), b = 9.605(2), and c = 15.096(3) A, beta = 104.35(2) degrees, and Z = 2. The copper(I) ion in a site of C(2) symmetry coordinates four N,N-dimethylthioformamide ligands in a slightly distorted tetrahedral coordination with Cu-S bond distances of 2.3249(8) and 2.3494(8) A. The triclinic (P1, No. 2) tris(N,N-dimethylthioformamide)silver(I) perchlorate, Ag(SCHN(CH(3))(2))(3)ClO(4), with a = 7.4149(5), b = 7.7953(5), and c = 17.1482(1) A, alpha = 98.341(5), beta = 93.910(5), and gamma = 107.084(5) degrees, and Z = 2, contains centrosymmetric Ag(2)(SCHN(CH(3))(2))(6)(2+) dimers in which two almost planar AgS(3) units are held together by an asymmetric double sulfur bridge with one short and one long Ag-S bond, 2.529(1) and 2.930(1) A, respectively. The Ag-S bond distances to the two terminal N,N-dimethylthioformamide ligands are 2.469(1) and 2.543(1) A. The solvated copper(I) and silver(I) ions in solution were found by means of large-angle X-ray scattering (LAXS) to coordinate four N,N-dimethylthioformamide molecules with the mean Cu-S and Ag-S bond distances 2.36(1) and 2.58(1) A, respectively, probably with distorted tetrahedral coordination geometry, while an EXAFS study gave the Cu-S bond distance 2.34(1) A. EXAFS studies showed a linear S-Au-S entity with an Au-S bond distance of 2.290(5) A in the structure of the solid bis(N,N-dimethylthioformamide)gold(I) tetrafluoroborate, Au(SCHN(CH(3))(2))(2)BF(4). The structure in solution is similar with a mean Au-S bond distance of 2.283(4) A. Raman and infrared vibrational spectra of the solvated copper(I), silver(I), and gold(I) ions in the solid state and N,N-dimethylthioformamide solution have been recorded and assigned.
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Affiliation(s)
- C M Stålhandske
- Department of Chemistry, Swedish University of Agricultural Sciences, P.O. Box 7015, SE-750 07 Uppsala, Sweden
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Vuilleumier R, Sprik M. Electronic properties of hard and soft ions in solution: Aqueous Na+ and Ag+ compared. J Chem Phys 2001. [DOI: 10.1063/1.1388901] [Citation(s) in RCA: 76] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Martínez JM, Pappalardo RR, Marcos ES. Study of the Ag+ Hydration by Means of a Semicontinuum Quantum-Chemical Solvation Model. J Phys Chem A 1997. [DOI: 10.1021/jp970138c] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- José M. Martínez
- Departamento de Química Física, Facultad de Química, Universidad de Sevilla, 41012-Sevilla, Spain
| | - Rafael R. Pappalardo
- Departamento de Química Física, Facultad de Química, Universidad de Sevilla, 41012-Sevilla, Spain
| | - Enrique Sánchez Marcos
- Departamento de Química Física, Facultad de Química, Universidad de Sevilla, 41012-Sevilla, Spain
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Tsutsui Y, Sugimoto KI, Wasada H, Inada Y, Funahashi S. EXAFS and ab Initio Molecular Orbital Studies on the Structure of Solvated Silver(I) Ions. J Phys Chem A 1997. [DOI: 10.1021/jp963792l] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yuko Tsutsui
- Laboratory of Analytical Chemistry, Faculty of Science, Nagoya University, Chikusa, Nagoya 464-01, Japan, and Department of Chemistry, Faculty of General Education, Gifu University, 1-1 Yanagido, Gifu 501-11, Japan
| | - Ken-ichi Sugimoto
- Laboratory of Analytical Chemistry, Faculty of Science, Nagoya University, Chikusa, Nagoya 464-01, Japan, and Department of Chemistry, Faculty of General Education, Gifu University, 1-1 Yanagido, Gifu 501-11, Japan
| | - Hiroaki Wasada
- Laboratory of Analytical Chemistry, Faculty of Science, Nagoya University, Chikusa, Nagoya 464-01, Japan, and Department of Chemistry, Faculty of General Education, Gifu University, 1-1 Yanagido, Gifu 501-11, Japan
| | - Yasuhiro Inada
- Laboratory of Analytical Chemistry, Faculty of Science, Nagoya University, Chikusa, Nagoya 464-01, Japan, and Department of Chemistry, Faculty of General Education, Gifu University, 1-1 Yanagido, Gifu 501-11, Japan
| | - Shigenobu Funahashi
- Laboratory of Analytical Chemistry, Faculty of Science, Nagoya University, Chikusa, Nagoya 464-01, Japan, and Department of Chemistry, Faculty of General Education, Gifu University, 1-1 Yanagido, Gifu 501-11, Japan
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W. Neilson G, K. Adya A. Chapter 4. Neutron diffraction studies on liquids. ACTA ACUST UNITED AC 1997. [DOI: 10.1039/pc093101] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Johansson G. Structures of Complexes in Solution Derived from X-Ray Diffraction Measurements. ADVANCES IN INORGANIC CHEMISTRY 1992. [DOI: 10.1016/s0898-8838(08)60260-3] [Citation(s) in RCA: 71] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Ahrland S, Ishiguro SI. Heats of solvation of the mercury(II), silver(I) and copper(I) ions, and of some of their halogeno complexes, in solvents of different coordinating properties. Inorganica Chim Acta 1988. [DOI: 10.1016/s0020-1693(00)81572-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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