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Faux DA, Istók Ö, Rahaman AA, McDonald PJ, McKiernan E, Brougham DF. Nuclear spin relaxation in aqueous paramagnetic ion solutions. Phys Rev E 2023; 107:054605. [PMID: 37328976 DOI: 10.1103/physreve.107.054605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Accepted: 04/20/2023] [Indexed: 06/18/2023]
Abstract
A Brownian shell model describing the random rotational motion of a spherical shell of uniform particle density is presented and validated by molecular dynamics simulations. The model is applied to proton spin rotation in aqueous paramagnetic ion complexes to yield an expression for the Larmor-frequency-dependent nuclear magnetic resonance spin-lattice relaxation rate T_{1}^{-1}(ω) describing the dipolar coupling of the nuclear spin of the proton with the electronic spin of the ion. The Brownian shell model provides a significant enhancement to existing particle-particle dipolar models without added complexity, allowing fits to experimental T_{1}^{-1}(ω) dispersion curves without arbitrary scaling parameters. The model is successfully applied to measurements of T_{1}^{-1}(ω) from aqueous manganese(II), iron(III), and copper(II) systems where the scalar coupling contribution is known to be small. Appropriate combinations of Brownian shell and translational diffusion models, representing the inner and outer sphere relaxation contributions, respectively, are shown to provide excellent fits. Quantitative fits are obtained to the full dispersion curve of each aquoion with just five fit parameters, with the distance and time parameters each taking a physically justifiable numerical value.
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Affiliation(s)
- David A Faux
- Department of Physics, University of Surrey, Guildford, GU2 7XH, United Kingdom
| | | | | | | | - Eoin McKiernan
- School of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland
| | - Dermot F Brougham
- School of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland
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2
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Zhang N, Tang J, Ma Y, Liang M, Zeng D, Hefter G. A spectroscopic study of solvent effects on the formation of Cu(ii)-chloride complexes in aqueous solution. Phys Chem Chem Phys 2021; 23:6807-6814. [PMID: 33724283 DOI: 10.1039/d0cp05243d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A combination of electronic (UV-vis) and X-ray absorption (EXAFS, XANES) spectroscopies has been used to investigate the formation of copper(ii)/chloride complexes in concentrated aqueous solutions. It is established that lowering the water activity by the addition of Mg(ClO4)2 at a constant Cl-/Cu(ii) ratio results in the replacement of water molecules by Cl- ions in the primary coordination shell of Cu(ii). This behavior closely parallels the effect of increasing the Cl-/Cu(ii) ratio and demonstrates that full understanding of the stoichiometry and structures of the complexes formed in concentrated metal-ion chloride solutions requires explicit consideration of the role of the solvent.
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Affiliation(s)
- Ning Zhang
- College of Science, Central South University of Forestry and Technology, Changsha 410004, Hunan, P. R. China.
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3
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Simonin JP. Determination of Thermodynamic Complexity Constants and Speciation for Multicomplexing Electrolytes within the Mean Spherical Approximation Model. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.8b04904] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jean-Pierre Simonin
- CNRS, Laboratoire PHENIX, Campus P.M. Curie, Sorbonne Universités, F-75005, Paris, France
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4
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Uchikoshi M, Shinoda K. Determination of structures of cupric-chloro complexes in hydrochloric acid solutions by UV-Vis and X-ray absorption spectroscopy. Struct Chem 2018. [DOI: 10.1007/s11224-018-1164-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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5
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Ju SW, Zhang N, Wang ZQ, Zhang RT, Zeng DW, Shao XP, Lin K. Contacted Ion Pairs in Aqueous CuCl2 by the Combination of Ratio Spectra, Difference Spectra, Second Order Difference Spectra in the UV-Visible Spectra. CHINESE J CHEM PHYS 2017. [DOI: 10.1063/1674-0068/30/cjcp1711211] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Affiliation(s)
- Si-wen Ju
- School of Physics and Optoelectronic Engineering, Xidian University, Xi'an 710071, China
| | - Ning Zhang
- College of Science, Central South University of Forestry and Technology, Changsha 410004, China
| | - Zhi-qiang Wang
- School of Physics and Optoelectronic Engineering, Xidian University, Xi'an 710071, China
| | - Rui-ting Zhang
- School of Physics and Optoelectronic Engineering, Xidian University, Xi'an 710071, China
| | - De-wen Zeng
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
| | - Xiao-peng Shao
- School of Physics and Optoelectronic Engineering, Xidian University, Xi'an 710071, China
| | - Ke Lin
- School of Physics and Optoelectronic Engineering, Xidian University, Xi'an 710071, China
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6
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Determination of the Distribution of Cupric Chloro-Complexes in Hydrochloric Acid Solutions at 298 K. J SOLUTION CHEM 2017. [DOI: 10.1007/s10953-017-0597-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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7
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Ma K, Zhao L. The Opposite Effect of Metal Ions on Short-/Long-Range Water Structure: A Multiple Characterization Study. Int J Mol Sci 2016; 17:ijms17050602. [PMID: 27120598 PMCID: PMC4881438 DOI: 10.3390/ijms17050602] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2016] [Revised: 04/14/2016] [Accepted: 04/18/2016] [Indexed: 12/21/2022] Open
Abstract
Inorganic electrolyte solutions are very important in our society as they dominate many biochemical and geochemical processes. Herein, an in-depth study was performed to illustrate the ion-induced effect on water structure by coupling NMR, viscometer, Raman and Molecular Dynamic (MD) simulations. The NMR coefficient (BNMR) and diffusion coefficient (D) from NMR, and viscosity coefficient (Bvis) from a viscometer all proved that dissolved metal ions are capable of enhancing the association degree of adjacent water molecules, and the impact on water structure decreased in the order of Cr3+ > Fe3+ > Cu2+ > Zn2+. This regularity was further evidenced by Raman analysis; however, the deconvoluted Raman spectrum indicated the decrease in high association water with salt concentration and the increase in low association water before 200 mmol·L−1. By virtue of MD simulations, the opposite changing manner proved to be the result of the opposite effect on short-/long-range water structure induced by metal ions. Our results may help to explain specific protein denaturation induced by metal ions.
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Affiliation(s)
- Kai Ma
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China.
| | - Lin Zhao
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China.
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8
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Orzeł Ł, Szmyd B, Rutkowska-Żbik D, Fiedor L, van Eldik R, Stochel G. Fine tuning of copper(II)-chlorophyll interactions in organic media. Metalation versus oxidation of the macrocycle. Dalton Trans 2015; 44:6012-22. [PMID: 25720308 DOI: 10.1039/c4dt03809f] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The nature of chlorophyll interactions with copper(II) ions varies considerably in organic solvents, depending on the dominant coordinative form. Besides formation of the metallo tetrapyrrolic complex, Cu(II) ions can cause oxidation of the pigment, reversible or irreversible, which can lead to the destruction of the macrocyclic structure. All these reaction types can be distinguished within a quite narrow range of reaction conditions. The ability to form new metallo derivatives in either metalation or transmetalation reactions is obviously limited by the concentration of the potential oxidant, but can be secured below this level via suitable composition of the reaction system. The decisive factor in the selection of a specific reaction pathway is the presence of a potential ligand that can affect the reactivity of Cu(II) for example by shifting its redox potential. Spectroscopic and electrochemical studies were performed in order to determine the predominant species of Cu(II) in methanol, nitromethane and acetonitrile in the presence of chloride and acetate ions, as well as to assign their appropriate oxidizing ability. This allowed us to estimate the boundary conditions for the electron transfer processes in chlorophyll-Cu(II) systems. Chlorophyll and its free base can undergo both types of electron transfer processes, however, they reveal different susceptibilities that make this class of ligands quite versatile markers in tuning the reactivity of metal ions in solutions.
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Affiliation(s)
- Łukasz Orzeł
- Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland.
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9
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Chemical speciation in concentrated aqueous solutions of CuCl2 using thin-film UV–visible spectroscopy combined with DFT calculations. J Mol Liq 2014. [DOI: 10.1016/j.molliq.2014.06.025] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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10
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Applegarth LMSGA, Corbeil CR, Mercer DJW, Pye CC, Tremaine PR. Raman and ab Initio Investigation of Aqueous Cu(I) Chloride Complexes from 25 to 80 °C. J Phys Chem B 2013; 118:204-14. [DOI: 10.1021/jp406580q] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
| | | | - Darren J. W. Mercer
- Department
of Chemistry, Saint Mary’s University, Halifax, Nova Scotia, Canada B3H 3C3
| | - Cory C. Pye
- Department
of Chemistry, Saint Mary’s University, Halifax, Nova Scotia, Canada B3H 3C3
| | - Peter R. Tremaine
- Department
of Chemistry, University of Guelph, Guelph, Ontario, Canada N1G 2W1
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11
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Zhao H, Chang J, Boika A, Bard AJ. Electrochemistry of High Concentration Copper Chloride Complexes. Anal Chem 2013; 85:7696-703. [DOI: 10.1021/ac4016769] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hong Zhao
- Center for Electrochemistry, Department of Chemistry
and Biochemistry, University of Texas at Austin, 105 East 24th Street Station A5300, Austin, Texas 78712, United
States
| | - Jinho Chang
- Center for Electrochemistry, Department of Chemistry
and Biochemistry, University of Texas at Austin, 105 East 24th Street Station A5300, Austin, Texas 78712, United
States
| | - Aliaksei Boika
- Center for Electrochemistry, Department of Chemistry
and Biochemistry, University of Texas at Austin, 105 East 24th Street Station A5300, Austin, Texas 78712, United
States
| | - Allen J. Bard
- Center for Electrochemistry, Department of Chemistry
and Biochemistry, University of Texas at Austin, 105 East 24th Street Station A5300, Austin, Texas 78712, United
States
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12
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Bowron DT, Amboage M, Boada R, Freeman A, Hayama S, Díaz-Moreno S. The hydration structure of Cu2+: more tetrahedral than octahedral? RSC Adv 2013. [DOI: 10.1039/c3ra42400f] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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13
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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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14
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Li G, Camaioni DM, Amonette JE, Zhang ZC, Johnson TJ, Fulton JL. [CuCln]2−n Ion-Pair Species in 1-Ethyl-3-methylimidazolium Chloride Ionic Liquid−Water Mixtures: Ultraviolet−Visible, X-ray Absorption Fine Structure, and Density Functional Theory Characterization. J Phys Chem B 2010; 114:12614-22. [DOI: 10.1021/jp106762b] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Guosheng Li
- Chemical and Materials Sciences Division, Pacific Northwest National Laboratory, Richland, Washington, 99354
| | - Donald M. Camaioni
- Chemical and Materials Sciences Division, Pacific Northwest National Laboratory, Richland, Washington, 99354
| | - James E. Amonette
- Chemical and Materials Sciences Division, Pacific Northwest National Laboratory, Richland, Washington, 99354
| | - Z. Conrad Zhang
- Chemical and Materials Sciences Division, Pacific Northwest National Laboratory, Richland, Washington, 99354
| | - Timothy J. Johnson
- Chemical and Materials Sciences Division, Pacific Northwest National Laboratory, Richland, Washington, 99354
| | - John L. Fulton
- Chemical and Materials Sciences Division, Pacific Northwest National Laboratory, Richland, Washington, 99354
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15
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Rahaman O, van Duin ACT, Bryantsev VS, Mueller JE, Solares SD, Goddard WA, Doren DJ. Development of a ReaxFF Reactive Force Field for Aqueous Chloride and Copper Chloride. J Phys Chem A 2010; 114:3556-68. [DOI: 10.1021/jp9090415] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Obaidur Rahaman
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, Material and Process Simulation Center, California Institute of Technology, Pasadena, California 91125, and Department of Mechanical Engineering, University of Maryland, College Park, Maryland 20742
| | - Adri C. T. van Duin
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, Material and Process Simulation Center, California Institute of Technology, Pasadena, California 91125, and Department of Mechanical Engineering, University of Maryland, College Park, Maryland 20742
| | - Vyacheslav S. Bryantsev
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, Material and Process Simulation Center, California Institute of Technology, Pasadena, California 91125, and Department of Mechanical Engineering, University of Maryland, College Park, Maryland 20742
| | - Jonathan E. Mueller
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, Material and Process Simulation Center, California Institute of Technology, Pasadena, California 91125, and Department of Mechanical Engineering, University of Maryland, College Park, Maryland 20742
| | - Santiago D. Solares
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, Material and Process Simulation Center, California Institute of Technology, Pasadena, California 91125, and Department of Mechanical Engineering, University of Maryland, College Park, Maryland 20742
| | - William A. Goddard
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, Material and Process Simulation Center, California Institute of Technology, Pasadena, California 91125, and Department of Mechanical Engineering, University of Maryland, College Park, Maryland 20742
| | - Douglas J. Doren
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, Material and Process Simulation Center, California Institute of Technology, Pasadena, California 91125, and Department of Mechanical Engineering, University of Maryland, College Park, Maryland 20742
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16
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Xia FF, Yi HB, Zeng D. Hydrates of Copper Dichloride in Aqueous Solution: A Density Functional Theory and Polarized Continuum Model Investigation. J Phys Chem A 2009; 113:14029-38. [DOI: 10.1021/jp909092p] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Fei-Fei Xia
- College of Chemistry and Chemical Engineering, Hunan University, Changsha, Hunan 410082, China, and College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan 410083, China
| | - Hai-Bo Yi
- College of Chemistry and Chemical Engineering, Hunan University, Changsha, Hunan 410082, China, and College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan 410083, China
| | - Dewen Zeng
- College of Chemistry and Chemical Engineering, Hunan University, Changsha, Hunan 410082, China, and College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan 410083, China
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17
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Smirnov PR, Trostin VN. Structural parameters of Cu2+ aqua complexes in aqueous solutions of its salts. RUSS J GEN CHEM+ 2009. [DOI: 10.1134/s1070363209080015] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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18
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Morré DJ, Heald SM, Coleman J, Orczyk J, Jiang Z, Morré DM. Structural observations of time dependent oscillatory behavior of CuIICl2 solutions measured via extended X-ray absorption fine structure. J Inorg Biochem 2007; 101:715-26. [PMID: 17320185 DOI: 10.1016/j.jinorgbio.2006.12.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2006] [Revised: 12/11/2006] [Indexed: 11/22/2022]
Abstract
Cell surface ECTO-NOX proteins exhibit a clock-related, temperature-independent entrainable pattern of periodic (24 min) oscillations in the rate of oxidation of NAD(P)H. Aqueous solutions of copper salts also oxidize NAD(P)H with a similar temperature-independent pattern. For both, five maxima are observed, two of which are separated by 6 min and the remaining three are separated by 4.5 min. In D2O, the pattern is retained but the period length is proportionately increased to 30 min in direct relationship to the 30 h circadian day observed with D2O-grown organisms. With copper solutions, periodic changes in redox potential correlate precisely with the periodic changes in the rates of NAD(P)H oxidation. Consequently, the local environment of the Cu2+ ion in copper chloride solutions was investigated by X-ray absorption spectroscopy. Detailed extended X-ray absorption fine structure (EXAFS) analyses revealed a pattern of oscillations closely resembling those of the copper-catalyzed oxidation of NADH. With CuCl2 in D2O, a pattern with a period length of 30 min was observed. The findings suggest a regular pattern of distortion in the axial and/or equatorial oxygen atoms of the coordinated water molecules which correlate with redox potential changes sufficient to oxidize NADH. A metastable equilibrium condition in the ratio of ortho to para nuclear spin orientation of the water associated hydrogen atoms would be kinetically consistent with a 24-30 min timeframe. The temperature independence of the biological clock can thus be understood as the consequence of a physical rather than a chemical basis for the timing events.
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Affiliation(s)
- D J Morré
- Department of Medicinal Chemistry and Molecular Pharmacology, Hansen Life Sciences Research Building, Purdue University, 201 S. University Street, West Lafayette, IN 47907-2064, USA.
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20
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Schwenk CF, Rode BM. New Insights into the Jahn-Teller Effect through ab initio Quantum-Mechanical/Molecular-Mechanical Molecular Dynamics Simulations of CuII in Water. Chemphyschem 2003; 4:931-43. [PMID: 14562438 DOI: 10.1002/cphc.200300659] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The CuII hydration shell structure has been studied by means of classical molecular dynamics (MD) simulations including three-body corrections and hybrid quantum-mechanical/molecular-mechanical (QM/MM) molecular dynamics (MD) simulations at the Hartree-Fock level. The copper(II) ion is found to be six-fold coordinated and [Cu(H2O)6]2+ exhibits a distorted octahedral structure. The QM/MM MD approach reproduces correctly the experimentally observed Jahn-Teller effect but exhibits faster inversions (< 200 fs) and a more complex behaviour than expected from experimental data. The dynamic Jahn-Teller effect causes the high lability of [Cu(H2O)6]2+ with a ligand-exchange rate constant some orders or magnitude higher than its neighbouring ions NiII and ZnII. Nevertheless, no first-shell water exchange occurred during a 30-ps simulation. The structure of the hydrated ion is discussed in terms of radial distribution functions, coordination numbers, and various angular distributions and the dynamical properties as librational and vibrational motions and reorientational times were evaluated, which lead to detailed information about the first hydration shell. Second-shell water-exchange processes could be observed within the simulation time scale and yielded a mean ligand residence time of approximelty 20 ps.
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Affiliation(s)
- Christian F Schwenk
- Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck, Innrain 52a, 6020 Innsbruck, Austria
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21
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Persson I, Persson P, Sandström M, Ullström AS. Structure of Jahn–Teller distorted solvated copper(ii) ions in solution, and in solids with apparently regular octahedral coordination geometry. ACTA ACUST UNITED AC 2002. [DOI: 10.1039/b200698g] [Citation(s) in RCA: 146] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Fulton JL, Hoffmann MM, Darab JG, Palmer BJ, Stern EA. Copper(I) and Copper(II) Coordination Structure under Hydrothermal Conditions at 325 °C: An X-ray Absorption Fine Structure and Molecular Dynamics Study. J Phys Chem A 2000. [DOI: 10.1021/jp001949a] [Citation(s) in RCA: 105] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- John L. Fulton
- Environmental and Health Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99352
| | - Markus M. Hoffmann
- Environmental and Health Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99352
| | - John G. Darab
- Environmental and Health Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99352
| | - Bruce J. Palmer
- Environmental and Health Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99352
| | - Edward A. Stern
- Physics Department, University of Washington, Seattle, Washington 98195
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23
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Fulton JL, Hoffmann MM, Darab JG. An X-ray absorption fine structure study of copper(I) chloride coordination structure in water up to 325°C. Chem Phys Lett 2000. [DOI: 10.1016/s0009-2614(00)01110-6] [Citation(s) in RCA: 81] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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24
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Fitts JP, Persson P, Brown GE, Parks GA. Structure and Bonding of Cu(II)-Glutamate Complexes at the gamma-Al(2)O(3)-Water Interface. J Colloid Interface Sci 1999; 220:133-147. [PMID: 10550251 DOI: 10.1006/jcis.1999.6521] [Citation(s) in RCA: 67] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Thecomposition and mode of attachment of Cu(II) complexes at the gamma-Al(2)O(3)-water interface in suspensions containing a simple amino acid (glutamate) were characterized with EXAFS and FTIR spectroscopies. The spectroscopic results indicate that two types of Cu(II)-glutamate-alumina interactions are primarily responsible for Cu(II) and glutamate uptake between pH 4 and 9. In acidic suspensions of alumina, glutamate forms a bridge between Cu(II) ions and the (hydr)oxide surface (Type B complex). In this Type B surface complex, Cu(II) is bonded to amino acid headgroups (i.e., (+)H(3)NCHRCOO(-)) of two glutamate molecules. Spectroscopic and ionic strength dependent uptake results are combined to propose that the nonbonded side chain carboxylate groups of this complex are attracted to the oxide surface through long-range forces, leading to enhanced Cu(II) uptake relative to the glutamate-free system. In alkaline suspensions the relative amount of surface-bound Cu(II) complexed by glutamate decreases, and a direct Cu(II)-surface bond becomes the dominant mode of attachment (Type A complex). These surface complexes differ markedly from the species found in the alumina-free Cu(II)-glutamate aqueous system under similar solution conditions, where Cu(H(2)O)(2+)(6) and Cu(glutamate)(2-)(2) are the dominant species in acidic and alkaline solutions, respectively. Based on these spectroscopic results, surface complexation reactions are proposed for the Cu(II) and glutamate ternary interactions with the alumina surface in this system. Similarities between the results of this study and Cu(II) uptake behavior and complexation in the presence of natural organic material (NOM) indicate that Cu(II)-glutamate interactions mimic those in more complex Cu(II)-NOM-mineral-water systems. Copyright 1999 Academic Press.
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Affiliation(s)
- JP Fitts
- Surface and Aqueous Geochemistry Group, Department of Geological and Environmental Sciences, Stanford University, Stanford, California, 94305-2115
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25
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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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