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Zhang S, Govindaraju GV, Cheng CY, Daep CA, Chen D, Castro C, Corrigan PS, Masters JG, Pan L, Xu G, Brinzari TV, Myers CP. Oxidative stability of chelated Sn(II) (aq) at neutral pH: The critical role of NO 3- ions. SCIENCE ADVANCES 2024; 10:eadq0839. [PMID: 39356766 PMCID: PMC11446270 DOI: 10.1126/sciadv.adq0839] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2024] [Accepted: 08/27/2024] [Indexed: 10/04/2024]
Abstract
Tin(II) compounds are versatile materials with applications across fields such as catalysis, diagnostic imaging, and therapeutic drugs. However, oxidative stabilization of Sn(II) has remained an unresolved challenge as its reactivity with water and dioxygen results in loss of functionality, limiting technological advancement. Approaches to slow Sn(II) oxidation with chelating ligands or sacrificial electron donors have yielded only moderate improvements. We demonstrate here that the addition of nitrate to pyrophosphate-chelated Sn(II)(aq) suppresses Sn(II) oxidation in water across a broad pH range. Evidence of hydroxyl radical concentration reduction and detection of a radical nitrogen species that only forms in the presence of chelated Sn(II) point to a radical-based reaction mechanism. While this chemistry can be broadly applied, we present that this approach maintains Sn(II)'s antibacterial and anti-inflammatory efficacies as an example of sustained oral chemotherapeutic functionality.
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Affiliation(s)
- Shaoyi Zhang
- Colgate-Palmolive, 909 River Road, Piscataway, NJ 08855, USA
| | | | - Chi-Yuan Cheng
- Colgate-Palmolive, 909 River Road, Piscataway, NJ 08855, USA
| | | | - Dandan Chen
- Colgate-Palmolive, 909 River Road, Piscataway, NJ 08855, USA
| | - Cristina Castro
- Colgate-Palmolive, 909 River Road, Piscataway, NJ 08855, USA
| | | | | | - Long Pan
- Colgate-Palmolive, 909 River Road, Piscataway, NJ 08855, USA
| | - Guofeng Xu
- Colgate-Palmolive, 909 River Road, Piscataway, NJ 08855, USA
| | | | - Carl P. Myers
- Colgate-Palmolive, 909 River Road, Piscataway, NJ 08855, USA
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2
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Islam R, Blakemore K, Farnum BH. Role of Solvent Coordination in the Multi-electron Redox Cycle of Nickel Diethyldithiocarbamate. Inorg Chem 2024; 63:15851-15862. [PMID: 39121391 DOI: 10.1021/acs.inorgchem.4c02024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/11/2024]
Abstract
Nickel(II) diethyldithiocarbamate, NiII(dtc)2, is known to undergo a 2e- ligand-coupled electron transfer (LCET) oxidation to form [NiIV(dtc)3]+. However, the thermodynamics and kinetics of this 2e- process can be greatly affected by solvent coordination. For low coordinating solvents like acetonitrile and acetone, 2e- oxidation is observed via cyclic voltammetry (CV) at a single potential while stronger coordinating solvents like methanol, N,N-dimethylformamide, dimethyl sulfoxide, and pyridine exhibit a 1e- oxidation wave by formation of [NiIII(dtc)2(sol)x]+ intermediates. The decay of these complexes to eventually yield [NiIV(dtc)3]+ was monitored as a function of CV scan rate and temperature to extract rate constants and activation parameters. A thorough analysis of activation parameters revealed that ΔHapp⧧ generally increased with solvent coordination ability, suggesting solvent dissociation was a key factor in the rate limiting step. However, ΔSapp⧧ was found to be negative for all solvents, suggesting an associative mechanism in line with dimer formation with NiII(dtc)2 to facilitate ligand exchange. Density function theory calculations supported the competitive nature of dissociative and associative steps. Using these calculations, we propose two paths for decay of [NiIII(dtc)2(sol)x]+ species based on the coordination strength of the solvent. These studies point to the ability of solvents to either aid or hinder multielectron LCET reactions.
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Affiliation(s)
- Rezoanul Islam
- Department of Chemistry and Biochemistry, Auburn University, Auburn, Alabama 36849, United States
| | - Kallan Blakemore
- Department of Chemistry and Biochemistry, Auburn University, Auburn, Alabama 36849, United States
| | - Byron H Farnum
- Department of Chemistry and Biochemistry, Auburn University, Auburn, Alabama 36849, United States
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Ramalingam K, Rizzoli C, Sivagurunathan GS. Mono and trivalent thallium–sulfur interactions and their influence on the formation of nano thallium sulphide: single crystal X-ray structural and spectral studies on thallium(i)/(iii)–cyclohexylpiperazine dithiocarbamates. NEW J CHEM 2016. [DOI: 10.1039/c5nj02980e] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Tl–S bond distances in (1) are longer than in (2) and hence the greater ease of solvothermal decomposition of (1) to nano Tl4S3 than (2).
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Affiliation(s)
| | - Corrado Rizzoli
- Department of General and Inorganic Chemistry
- University of Parma
- Parma-43100
- Italy
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4
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Watanabe Y, Takahashi Y. An Experimental Study of Stabilization of Trivalent Thallium by Natural Organic Matter. CHEM LETT 2015. [DOI: 10.1246/cl.150551] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Lin J, Balamurugan D, Zhang P, Skourtis SS, Beratan DN. Two-Electron Transfer Pathways. J Phys Chem B 2015; 119:7589-97. [DOI: 10.1021/jp511429z] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | | | | | - Spiros S. Skourtis
- Department
of Physics, University of Cyprus, Nicosia 1678, Cyprus
- Freiburg Institute for Advanced Studies (FRIAS), University of Freiburg, Freiburg 79104, Germany
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6
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Protchenko AV, Dange D, Harmer JR, Tang CY, Schwarz AD, Kelly MJ, Phillips N, Tirfoin R, Birjkumar KH, Jones C, Kaltsoyannis N, Mountford P, Aldridge S. Stable GaX2, InX2 and TlX2 radicals. Nat Chem 2014; 6:315-9. [DOI: 10.1038/nchem.1870] [Citation(s) in RCA: 94] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2013] [Accepted: 01/13/2014] [Indexed: 11/09/2022]
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Chang J, Bard AJ. Detection of the Sn(III) Intermediate and the Mechanism of the Sn(IV)/Sn(II) Electroreduction Reaction in Bromide Media by Cyclic Voltammetry and Scanning Electrochemical Microscopy. J Am Chem Soc 2013; 136:311-20. [DOI: 10.1021/ja409958a] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jinho Chang
- Center
for Electrochemistry,
Department of Chemistry, University of Texas, Austin, Texas 78712, United States
| | - Allen J. Bard
- Center
for Electrochemistry,
Department of Chemistry, University of Texas, Austin, Texas 78712, United States
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8
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An Excursion into the Intriguing World of Polymeric Tl(I) and Ag(I) Cyanoximates. Polymers (Basel) 2011. [DOI: 10.3390/polym3031475] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
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Robertson D, Barnes C, Gerasimchuk N. Synthesis of the monosubstituted arylcyanoxime and its Na, Tl(I) and Ag(I) compounds. J COORD CHEM 2006. [DOI: 10.1080/0095897042000261908] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Daniel Robertson
- a Department of Chemistry , Southwest Missouri State University , Temple Hall 456, Springfield, MO 65804, USA
| | - Charles Barnes
- b Department of Chemistry , University of Missouri – Columbia , 125 Chemistry Building, Columbia, MO 65211, USA
| | - Nikolay Gerasimchuk
- a Department of Chemistry , Southwest Missouri State University , Temple Hall 456, Springfield, MO 65804, USA
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Chen W, Liu F, Matsumoto K, Autschbach J, Le Guennic B, Ziegler T, Maliarik M, Glaser J. Spectral and Structural Characterization of Amidate-Bridged Platinum−Thallium Complexes with Strong Metal−Metal Bonds. Inorg Chem 2006; 45:4526-36. [PMID: 16711703 DOI: 10.1021/ic051678o] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The reactions of [Pt(NH3)2(NHCOtBu)2] and TlX3 (X = NO3-, Cl-, CF3CO2-) yielded dinuclear [{Pt(ONO2)(NH3)2(NHCOtBu)}Tl(ONO2)2(MeOH)] (2) and trinuclear complexes [{PtX(RNH2)2(NHCOtBu)2}2Tl]+ [X = NO3- (3), Cl- (5), CF3CO2- (6)], which were spectroscopically and structurally characterized. Strong Pt-Tl interaction in the complexes in solutions was indicated by both 195Pt and 205Tl NMR spectra, which exhibit very large one-bond spin-spin coupling constants between the heteronuclei (1J(PtTl)), 146.8 and 88.84 kHz for 2 and 3, respectively. Both the X-ray photoelectron spectra and the 195Pt chemical shifts reveal that the complexes have Pt centers whose oxidation states are close to that of Pt(III). Characterization of these complexes by X-ray diffraction analysis confirms that the Pt and Tl atoms are held together by very short Pt-Tl bonds and are supported by the bridging amidate ligands. The Pt-Tl bonds are shorter than 2.6 Angstrom, indicating a strong metal-metal attraction between these two metals. Compound 2 was found to activate the C-H bond of acetone to yield a platinum(IV) acetonate complex. This reactivity corresponds to the property of Pt(III) complexes. Density functional theory calculations were able to reproduce the large magnitude of the metal-metal spin-spin coupling constants. The couplings are sensitive to the computational model because of a delicate balance of metal 6s contributions in the frontier orbitals. The computational analysis reveals the role of the axial ligands in the magnitude of the coupling constants.
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Affiliation(s)
- Wanzhi Chen
- Department of Chemistry, Zhejiang University, Hangzhou 310028, China.
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Robertson D, Cannon JF, Gerasimchuk N. Double-Stranded Metal−Organic Networks for One-Dimensional Mixed Valence Coordination Polymers. Inorg Chem 2005; 44:8326-42. [PMID: 16270971 DOI: 10.1021/ic050465w] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The design of new types of metal-organic networks and the search for unusual crystal architecture represents an important task for modern inorganic and materials chemistry research. A group of new monosubstituted phenylcyanoximes, containing F, Cl, and Br atoms at the 2, 3, or 4 positions, were synthesized using the high yield nitrosation reaction with CH3-ONO and were spectroscopically (1H NMR, 13C NMR, UV-visible, IR, mass spectrometry) and structurally characterized. Results of X-ray analysis revealed nonplanar trans-anti geometry for 2-chlorophenyl(oximino)acetonitrile, H(2Cl-PhCO); a nonplanar anti configuration for 4-chlorophenyl(oximino)acetonitrile, H(4Cl-PhCO); and planar cis-syn geometry for 3-fluorophenyl(oximino)acetonitrile, H(3F-PhCO). All arylcyanoximes undergo deprotonation in solutions with the formation of colored anions exhibiting pronounced negative solvatochromism in a series of polar protic and aprotic solvents. Nine thallium(I) cyanoximates were obtained using the reaction between hot (approximately 95 degrees C) aqueous solutions of Tl2CO3 and solid powdery monohalogenated arylcyanoximes HL. Crystal structures of two Tl(I) cyanoximates [Tl(2Cl-PhCO) and Tl(4Br-PhCO)] contained centrosymmetric dimeric units (TlL)2 that are connected to a coordination polymer by means of an oxygen atom of the oxime group of the neighboring molecule. Cyanoxime anions act as bridging ligands in both structures where the polymeric motif consists of double-stranded Tl-O chains interconnected with the formation of zigzagging Tl2O2 planar rhombes. Thallium atoms form infinite linear arrays with close intermetallic separations. The nearest Tl(I)...Tl(I) distances are 3.838 and 4.058 angstroms in the Tl(2Cl-PhCO) and Tl(4Br-PhCO) structures, respectively, close to that in metallic thallium (3.456 angstroms). Monosubstituted phenyl groups are well aligned in pi-stacking columns that are perpendicular to the array of Tl(I) atoms and stabilize formed structures. Coordination polyhedrons of thallium(I) in these complexes represent distorted trigonal pyramids with stereoactive lone pair.
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Affiliation(s)
- Daniel Robertson
- Department of Chemistry, Southwest Missouri State University, Temple Hall 456, Springfield, Missouri 65804, USA
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13
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Dolidze TD, Khoshtariya DE, Behm M, Lindbergh G, Glaser J. Two-equivalent electrochemical reduction of a cyano-complex [TlIII(CN)2]+ and the novel di-nuclear compound [(CN)5PtII−TlIII]0. Electrochim Acta 2005. [DOI: 10.1016/j.electacta.2005.02.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Macpherson BP, Alzoubi BM, Bernhardt PV, Martínez M, Tregloan PA, van Eldik R. Pressure and temperature effects on metal-to-metal charge transfer in cyano-bridged CoIII–FeIIcomplexes. Dalton Trans 2005:1459-67. [PMID: 15824784 DOI: 10.1039/b418054b] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The effects of pressure and temperature on the energy (Eop) of the metal-to-metal charge transfer (MMCT, FeII-->CoIII) transition of the cyano-bridged complexes trans-[L14CoNCFe(CN)5]- and cis-[L14CoNCFe(CN)5]- (where L14=6-methyl-1,4,8,11-tetraazacyclotetradecan-6-amine) were examined. The changes in the redox potentials of the cobalt and iron metal centres with pressure and temperature were also examined and the results interpreted with Marcus-Hush theory. The observed redox reaction volumes can mainly be accounted for in terms of localised electrostriction effects. The shifts in Eop due to both pressure and temperature were found to be less than the shifts in the energy difference (DeltaE degrees]) between the CoIII-FeII and CoII-FeIII redox isomers. The pressure and temperature dependence of the reorganisational energy, as well as contributions arising from the different spin states of CoII, are discussed in order to account for this trend. To study the effect of pressure on CoIII electronic absorption bands, a new cyano-bridged complex, trans-[L14CoNCCo(CN)5], was prepared and characterised spectroscopically and structurally. X-Ray crystallography revealed this complex to be isostructural with trans-[L14CoNCFe(CN)5].5H2O.
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Petrov EG, Teslenko VI, May V. Bridge mediated two-electron transfer reactions: On the influence of intersite Coulomb interactions. J Chem Phys 2004; 121:5328-38. [PMID: 15352826 DOI: 10.1063/1.1780165] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Donor-acceptor two-electron transfer (TET) mediated by a linear molecular bridge is described theoretically. The particular case is considered where the TET takes place in the presence of a strong electronic intersite coupling within the bridge and against the background of fast vibrational relaxation processes. For such a situation the coarse-grained description of bridge-assisted electron transfer in molecular systems can be utilized [Petrov et al., J. Phys. Chem. B 106, 3092 (2002)]. In the present case it leads to kinetic equations and rate expression for TET reactions. Our recent treatment of completely nonadiabtic TET reactions [Petrov et al., J. Chem. Phys. 120, 4441 (2004)] including a reduction to single-exponential kinetics (with overall transfer rate K(TET)) is generalized here to the case of strong intrabridge coupling and the presence of intersite Coulomb interactions. The dependence of K(TET) on the bridge length which is determined by a separate stepwise and concerted contribution is discussed in detail. It is found that the intersite Coulomb interaction favors the TET if the donor and the acceptor are uncharged in their completely reduced states (with two excess electrons present).
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Affiliation(s)
- E G Petrov
- Bogolyubov Institute for Theoretical Physics, National Academy of Sciences of Ukraine, 14-b Metrologichna strasse, UA-03143 Kiev, Ukraine
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Petrov EG, Zelinskyy YR, May V. Bridge-Mediated Two-Electron Transfer via Delocalized Bridge Orbitals. J Phys Chem B 2004. [DOI: 10.1021/jp048571r] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- E. G. Petrov
- Bogolyubov Institute for Theoretical Physics, National Academy of Sciences of Ukraine, 14-b Metrologichna str., UA-03143 Kiev, Ukraine, and Institut für Physik, Humboldt Universität zu Berlin, Newtonstrasse 15, D-12489, Berlin, Germany
| | - Ya. R. Zelinskyy
- Bogolyubov Institute for Theoretical Physics, National Academy of Sciences of Ukraine, 14-b Metrologichna str., UA-03143 Kiev, Ukraine, and Institut für Physik, Humboldt Universität zu Berlin, Newtonstrasse 15, D-12489, Berlin, Germany
| | - V. May
- Bogolyubov Institute for Theoretical Physics, National Academy of Sciences of Ukraine, 14-b Metrologichna str., UA-03143 Kiev, Ukraine, and Institut für Physik, Humboldt Universität zu Berlin, Newtonstrasse 15, D-12489, Berlin, Germany
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STANBURY DAVIDM. RECENT ADVANCES IN ELECTRON-TRANSFER REACTIONS. ADVANCES IN INORGANIC CHEMISTRY 2003. [DOI: 10.1016/s0898-8838(03)54007-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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