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Böszörményi É, Dömötör O, Kutus B, Varga G, Peintler G, Sipos P. Coordination motifs of binary neodymium(III) D-gluconate, D-galactonate and L-gulonate complexes and the transition from inner- to outer-sphere coordination in neutral to strongly alkaline medium. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.132894] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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2
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Kang X, Chang Y, Yang L, Xu Y, Zhao G, Li S, Noda I, Liu K, Chen J, Wu J. Unexpected Deprotonation from a Chemically Inert OH Group Promoted by Metal Ions in Lanthanide-Erythritol Complexes. Inorg Chem 2021; 60:5172-5182. [PMID: 33710864 DOI: 10.1021/acs.inorgchem.1c00179] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Single-crystal structures of five lanthanide-erythritol complexes are reported. The analysis of the chemical compositions and scrutinization of structural features in the single-crystal data of the complexes led us to find that unexpected deprotonation occurs on the OH group of erythritol of three complexes. Considering these complexes were prepared in acidic environments, where spontaneous ionization on an OH group is suppressed, we suggest metal ions play an important role in promoting the proton transfer. To find out why the chemically inert OH is activated, the single-crystal structures of 63 rare-earth complexes containing organic ligands with multiple hydroxyl groups (OLMHs) were surveyed. The formation of μ2-bridges turns out to be directly relevant to the occurrence of deprotonation. When an OH group from an OLMH molecule participates in the formation of a μ2-bridge, the polarization ability of the metal ions becomes strong enough to promote the deprotonation on the OH group. The above structural characteristics may be useful in the rational design of catalysts that can activate the chemically inert OH group and promote the relevant chemical conversions.
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Affiliation(s)
- Xiaoyan Kang
- State Key Laboratory of Nuclear Physics and Technology, Institute of Heavy Ion Physics, School of Physics, Peking University, Beijing 100871, China.,Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Yedi Chang
- State Key Laboratory of Nuclear Physics and Technology, Institute of Heavy Ion Physics, School of Physics, Peking University, Beijing 100871, China.,China Nuclear Power Engineering Co., Ltd., Beijing 100840, China
| | - Limin Yang
- State Key Laboratory of Nuclear Physics and Technology, Institute of Heavy Ion Physics, School of Physics, Peking University, Beijing 100871, China
| | - Yizhuang Xu
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Guozhong Zhao
- Beijing Key Lab of Terahertz Spectroscopy and Imaging, Key Lab of Terahertz Optoelectronics, Ministry of Education, Department of Physics, Capital Normal University, Beijing 100048, China
| | - Shuai Li
- Beijing Key Lab of Terahertz Spectroscopy and Imaging, Key Lab of Terahertz Optoelectronics, Ministry of Education, Department of Physics, Capital Normal University, Beijing 100048, China
| | - Isao Noda
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.,Department of Materials Science and Engineering, University of Delaware, Newark, Delaware 19716, United States
| | - Kexin Liu
- State Key Laboratory of Nuclear Physics and Technology, Institute of Heavy Ion Physics, School of Physics, Peking University, Beijing 100871, China
| | - Jia'er Chen
- State Key Laboratory of Nuclear Physics and Technology, Institute of Heavy Ion Physics, School of Physics, Peking University, Beijing 100871, China
| | - Jinguang Wu
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
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Cai DH, Zhang CL, Liu QY, He L, Liu YJ, Xiong YH, Le XY. Synthesis, DNA binding, antibacterial and anticancer properties of two novel water-soluble copper(II) complexes containing gluconate. Eur J Med Chem 2021; 213:113182. [PMID: 33486198 DOI: 10.1016/j.ejmech.2021.113182] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2020] [Revised: 01/02/2021] [Accepted: 01/07/2021] [Indexed: 12/20/2022]
Abstract
In this paper, two new Cu(II) complexes, [Cu(Gluc)(HPB)(H2O)]Gluc (CuG1) and [Cu(Gluc)(HPBC)(H2O)]Gluc (CuG2) (where HPB = 2-(2'-pyridyl)benzimidazole, HPBC = 5-chloro-2-(2'-pyridyl)benzimidazole, Gluc = d-Gluconic acid), with good water solubility were synthesized and characterized. These complexes exhibited a five-coordinated tetragonal pyramidal geometry. The DNA binding and cleavage properties of the complexes were investigated using multi-spectroscopy, viscosity measurement, molecular docking and gel electrophoresis analysis methods. The results showed that the complexes could interact with DNA by insertion and groove binding, and cleave CT-DNA through a singlet oxygen-dependent pathway in the presence of ascorbic acid. The studies on antibacterial and anticancer activities in vitro demonstrated that both complexes had good inhibitory activity against three Gram-positive bacteria (Staphylococcus aureus, Bacillus subtilis, Listeria monocytogenes) and one Gram-negative bacterium (Escherichia coli) and good cytotoxic activity toward the tested cancer cells (A549, HeLa and SGC-7901). CuG2 showed higher antimicrobial and cytotoxic activities than CuG1, which was consistent with their binding strength and cleavage ability to DNA, indicating that their antimicrobial and cytotoxic activities may be related to the DNA interaction. Moreover, the cell-based mechanism studies have indicated that CuG1 and CuG2 could arrest the cell cycle at G2/M phase, elevate the levels of intracellular reactive oxygen species (ROS) and decrease the mitochondrial membrane potential (MMP). The results showed that the complexes could induce apoptosis through DNA-damaged and ROS-mediated mitochondrial dysfunction pathways. Finally, the in vivo antitumor study revealed that CuG2 inhibited tumor growth by 50.44%, which is better than that of cisplatin (40.94%).
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Affiliation(s)
- Dai-Hong Cai
- Department of Applied Chemistry, South China Agricultural University, Guangzhou, 510642, PR China
| | - Chun-Lian Zhang
- Department of Applied Chemistry, South China Agricultural University, Guangzhou, 510642, PR China
| | - Qi-Yan Liu
- Department of Applied Chemistry, South China Agricultural University, Guangzhou, 510642, PR China
| | - Liang He
- Department of Applied Chemistry, South China Agricultural University, Guangzhou, 510642, PR China.
| | - Yun-Jun Liu
- School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou, 510006, PR China.
| | - Ya-Hong Xiong
- Department of Applied Chemistry, South China Agricultural University, Guangzhou, 510642, PR China
| | - Xue-Yi Le
- Department of Applied Chemistry, South China Agricultural University, Guangzhou, 510642, PR China.
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4
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Recent advances in the aqueous chemistry of the calcium(II)-gluconate system – Equilibria, structure and composition of the complexes forming in neutral and in alkaline solutions. Coord Chem Rev 2020. [DOI: 10.1016/j.ccr.2020.213337] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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5
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Corrigendum. ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2019; 38:918-920. [PMID: 30909322 DOI: 10.1002/etc.4379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
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6
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McManus P, Hortin J, Anderson AJ, Jacobson AR, Britt DW, Stewart J, McLean JE. Rhizosphere interactions between copper oxide nanoparticles and wheat root exudates in a sand matrix: Influences on copper bioavailability and uptake. ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2018; 37:2619-2632. [PMID: 29978493 DOI: 10.1002/etc.4226] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2018] [Revised: 03/26/2018] [Accepted: 07/02/2018] [Indexed: 05/27/2023]
Abstract
The impact of copper oxide nanoparticles (CuONPs) on crop production is dependent on the biogeochemistry of Cu in the rooting zone of the plant. The present study addressed the metabolites in wheat root exudates that increased dissolution of CuONPs and whether solubility correlated with Cu uptake into the plant. Bread wheat (Triticum aestivum cv. Dolores) was grown for 10 d with 0 to 300 mg Cu/kg as CuONPs in sand, a matrix deficient in Fe, Zn, Mn, and Cu for optimum plant growth. Increased NP doses enhanced root exudation, including the Cu-complexing phytosiderophore, 2'-deoxymugineic acid (DMA), and corresponded to greater dissolution of the CuONPs. Toxicity, observed as reduced root elongation, was attributable to a combination of CuONPs and dissolved Cu complexes. Geochemical modeling predicted that the majority of the solution phase Cu was complexed with citrate at low dosing or DMA at higher dosing. Altered biogeochemistry within the rhizosphere correlated with bio-responses via exudate type, quantity, and metal uptake. Exposure of wheat to CuONPs led to dose-dependent decreases in Fe, Ca, Mg, Mn, and K in roots and shoots. The present study is relevant to growth of a commercially important crop, wheat, in the presence of CuONPs as a fertilizer, fungicide, or pollutant. Environ Toxicol Chem 2018;37:2619-2632. © 2018 SETAC.
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Affiliation(s)
- Paul McManus
- Utah Water Research Laboratory, Civil and Environmental Engineering, Utah State University, Logan, Utah, USA
| | - Joshua Hortin
- Utah Water Research Laboratory, Civil and Environmental Engineering, Utah State University, Logan, Utah, USA
| | - Anne J Anderson
- Department of Biological Engineering, Utah State University, Logan, Utah, USA
| | - Astrid R Jacobson
- Department of Plants, Soils and Climate, Utah State University, Logan, Utah, USA
| | - David W Britt
- Department of Biological Engineering, Utah State University, Logan, Utah, USA
| | - Joseph Stewart
- Utah Water Research Laboratory, Civil and Environmental Engineering, Utah State University, Logan, Utah, USA
| | - Joan E McLean
- Utah Water Research Laboratory, Civil and Environmental Engineering, Utah State University, Logan, Utah, USA
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The acidity and self-catalyzed lactonization of l-gulonic acid: Thermodynamic, kinetic and computational study. Carbohydr Res 2018; 467:14-22. [DOI: 10.1016/j.carres.2018.07.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2018] [Revised: 06/22/2018] [Accepted: 07/14/2018] [Indexed: 11/23/2022]
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8
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Kutus B, Dudás C, Peintler G, Pálinkó I, Sipos P. Configuration-dependent complex formation between Ca(II) and sugar carboxylate ligands in alkaline medium: Comparison of L-gulonate with D-gluconate and D-heptaguconate. Carbohydr Res 2018; 460:34-40. [DOI: 10.1016/j.carres.2018.01.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Revised: 01/31/2018] [Accepted: 01/31/2018] [Indexed: 11/25/2022]
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9
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Comprehensive study on expeditious conversion of pre-hydrolyzed alginic acid to furfural in Cu(II) biphasic systems using microwaves. MOLECULAR CATALYSIS 2018. [DOI: 10.1016/j.mcat.2017.11.013] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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10
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Tóth EN, May NV, Rockenbauer A, Peintler G, Gyurcsik B. Exploring the boundaries of direct detection and characterization of labile isomers - a case study of copper(ii)-dipeptide systems. Dalton Trans 2017; 46:8157-8166. [PMID: 28607997 DOI: 10.1039/c7dt00884h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The investigation of the linkage isomers of biologically essential and kinetically labile metal complexes in aqueous solutions poses a challenge, as these microspecies cannot be separately studied. Therefore, derivatives are commonly used to initially determine the stability or spectral characteristics of at least one of the isomers. Here we directly detect the isomers, describe the metal ion coordination sphere, speciation and thermodynamic parameters by a synergistic application of temperature dependent EPR and CD spectroscopic measurements in copper(ii)-dipeptide systems including His-Gly and His-Ala ligands. The ΔH = (-23 ± 4) kJ mol-1 value of the standard enthalpy change corresponding to the peptide-type to histamine-type isomerisation equilibrium of the [CuL]+ complex was corroborated by several techniques. The preferential coordination of the side-chains was observed at lower temperatures, whereas, metal-binding of the backbone atoms became favourable upon increasing temperature. This study exemplifies the necessity of using temperature dependent multiple methodologies for a reliable description of similar systems for upstream applications.
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Affiliation(s)
- Eszter N Tóth
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, H-6720 Szeged, Hungary. and PhD Program in Human Biology, School of Integrative and Global Majors, University of Tsukuba, Japan
| | - Nóra V May
- Research Centre for Natural Sciences, Hungarian Academy of Sciences, 1117 Budapest, Magyar tudósok körútja 2, Hungary
| | - Antal Rockenbauer
- Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, 1117 Budapest, Magyar tudósok körútja 2, Hungary and Department of Physics, Budapest University of Technology and Economics and MTA-BME Lendület Spintronics Research Group (PROSPIN), P.O. Box 91, H-1521 Budapest, Hungary
| | - Gábor Peintler
- Department of Physical Chemistry and Material Sciences, University of Szeged, Aradi Vértanuk tere 1, H-6720 Szeged, Hungary
| | - Béla Gyurcsik
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, H-6720 Szeged, Hungary.
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11
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Kutus B, Varga N, Peintler G, Lupan A, Attia AAA, Pálinkó I, Sipos P. Formation of mono- and binuclear neodymium(iii)–gluconate complexes in aqueous solutions in the pH range of 2–8. Dalton Trans 2017; 46:6049-6058. [DOI: 10.1039/c7dt00909g] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The structure and stability constants of four mononuclear and two, so far unknown and highly stable binuclear complexes have been determined.
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Affiliation(s)
- Bence Kutus
- Department of Inorganic and Analytical Chemistry
- University of Szeged
- H-6720 Szeged
- Hungary
- Material and Solution Structure Research Group
| | - Norbert Varga
- Department of Inorganic and Analytical Chemistry
- University of Szeged
- H-6720 Szeged
- Hungary
- Material and Solution Structure Research Group
| | - Gábor Peintler
- Department of Physical Chemistry and Material Science
- University of Szeged
- H-6720 Szeged
- Hungary
- Material and Solution Structure Research Group
| | - Alexandru Lupan
- Department of Chemistry
- Babes-Bolyai University
- Cluj-Napoca
- Romania
| | - Amr A. A. Attia
- Department of Chemistry
- Babes-Bolyai University
- Cluj-Napoca
- Romania
| | - István Pálinkó
- Department of Organic Chemistry
- University of Szeged
- H-6720 Szeged
- Hungary
- Material and Solution Structure Research Group
| | - Pál Sipos
- Department of Inorganic and Analytical Chemistry
- University of Szeged
- H-6720 Szeged
- Hungary
- Material and Solution Structure Research Group
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12
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Kutus B, Buckó Á, Peintler G, Pálinkó I, Sipos P. Calcium complexation and acid–base properties of l-gulonate, a diastereomer of d-gluconate. Dalton Trans 2016; 45:18281-18291. [DOI: 10.1039/c6dt03907c] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The structures of Ca-l-gulonate and Ca-d-gluconate complexes are slightly different due to the differences in the configuration of their ligands.
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Affiliation(s)
- Bence Kutus
- Department of Inorganic and Analytical Chemistry
- University of Szeged
- Szeged
- Hungary
- Materials and Solution Structure Research Group
| | - Ákos Buckó
- Department of Inorganic and Analytical Chemistry
- University of Szeged
- Szeged
- Hungary
- Materials and Solution Structure Research Group
| | - Gábor Peintler
- Department of Organic Chemistry
- University of Szeged
- Szeged
- Hungary
- Materials and Solution Structure Research Group
| | - István Pálinkó
- Department of Physical Chemistry and Materials Science
- University of Szeged
- Szeged
- Hungary
- Materials and Solution Structure Research Group
| | - Pál Sipos
- Department of Inorganic and Analytical Chemistry
- University of Szeged
- Szeged
- Hungary
- Materials and Solution Structure Research Group
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13
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Felten AS, Pellegrini-Moïse N, Selmeczi K, Henry B, Chapleur Y. Synthesis and Copper(II)-Complexation Properties of an Unusual Macrocyclic Structure Containing α/β-Amino Acids and Anomeric Sugar β-Amino Acid. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300454] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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14
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Copper inclusion in cellulose using sodium d-gluconate complexes. Carbohydr Polym 2012; 90:1345-52. [DOI: 10.1016/j.carbpol.2012.07.003] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2012] [Revised: 06/23/2012] [Accepted: 07/02/2012] [Indexed: 10/28/2022]
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15
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Amin MA, Abd El Rehim SS, El-Lithy AS. Corrosion, passivation and breakdown of passivity of Al and Al–Cu alloys in gluconic acid solutions. Electrochim Acta 2010. [DOI: 10.1016/j.electacta.2010.05.055] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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16
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Vercammen K, Glaus M, Van Loon LR. Complexation of Th(IV) and Eu(III) by α-isosaccharinic acid under alkaline conditions. RADIOCHIM ACTA 2009. [DOI: 10.1524/ract.2001.89.6.393] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
The complexation of Th(IV) and Eu(III) by α-isosaccharinic acid (ISA) has been studied in the pH range from 10.7 to 13.3 by batch sorption experiments, and the influence of Ca on the complexation was investigated. Sixteen data sets – each determined at variable ISA concentrations – are used to determine the stoichiometry of the complexation reactions and the stability constants. Based on best-fit analysis of the sorption data, it is postulated that 1:1 Th:ISA complexes are formed in the absence of Ca according to the complexation reaction: Th+ISA↔(ThISA)-4H+4H with logK=-10.1 atI=0.3 M. In the presence of Ca, the sorption data can be interpreted best by a mixed-metal complex, according to the complexation reaction: Th+2ISA+Ca↔(Th(ISA)2Ca)-4H+4H with logKCa=-3.6 atI=0.3 M. There are no indications that Ca participates in complexes of ISA with Eu. The sorption data suggest that 1:1 Eu:ISA complexes are dominant in the pH range from 10.7 to 13.3 according to the complexation reaction: Eu+ISA↔(EuISA)-4H+4H with logK=-30.6 atI= 0.3 M. It is important to note that the stoichiometric numbers and stability constants proposed here are not independent of the hydrolysis reactions of the two metal cations. Thus, the same hydrolysis data as used here have to be applied in speciation calculations with the ISA complexation data for Eu(III) and Th(IV).
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Dupont-Leclercq L, Giroux S, Parant S, Khoudour L, Henry B, Rubini P. Complexation of Cu(II) by original tartaric acid-based ligands in nonionic micellar media: thermodynamic study and applications. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:3450-3458. [PMID: 19708239 DOI: 10.1021/la803931g] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The complexation of Cu(II) with original alkylamidotartaric acids (C(x)T) is investigated in homogeneous aqueous medium and in the presence of nonionic micelles of Brij 58 (C16EO20), thanks to various analytical techniques such as NMR self-diffusion experiments, CD and UV-vis spectroscopy, ESI mass spectrometry, pHmetry and micellar-enhanced ultrafiltration (MEUF). First, a complete speciation study proves the formation of dimeric complexes in water and provides their formation constants. Second, a similar study is led in the presence of nonionic micelles. It underlines a modification of the apparent equilibrium constants in micellar medium and demonstrates that the structure of the complexes is slightly modified in the presence of micelles. This thermodynamic and structural study is applied to modelize the evolution of the extraction yields of Cu(II) by the micelles as a function of pH and to identify the complexes extracted in the micelles. The effects of the chain length of the ligand (C3T vs C8T) on the solubilization properties are put into relief and discussed. Anionic species are proved to be more incorporated in the nonionic micelles than the cationic species. The extracting system constituted of octylamidotartaric acid (CsT) solubilized in nonionic micelles of Brij 58 is demonstrated to be very efficient for the extraction of Cu(II) by MEUF, this technique being an interesting green alternative to traditional solvent extraction.
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Affiliation(s)
- Laurence Dupont-Leclercq
- Groupe C2M2, UMR SRSMC 7565 CNRS-Université Henri Poincaré, Nancy-Université, BP 239, F-54506 Vandoeuvre-lès-Nancy Cedex, France
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18
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Bernal-Uruchurtu MI, Metta-Magaña AJ, Guerrero-Álvarez JA, Reyes-Martínez R, Tlahuext H. Theoretical study of the experimental coordination behavior of N-(2-aminophenyl)-D-glycero-D-gulo-heptonamide to Hg(II) ion. Carbohydr Res 2008; 343:2804-12. [PMID: 18774555 DOI: 10.1016/j.carres.2008.08.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2008] [Revised: 07/26/2008] [Accepted: 08/03/2008] [Indexed: 12/01/2022]
Abstract
The reactivity of N-(2-aminophenyl)-d-glycero-d-gulo-heptonamide (adgha), with the group 12 cations, Zn(II), Cd(II), and Hg(II), was studied in DMSO-d(6) solution. The studied system showed a selective coordination to Hg(II), and the products formed were characterized by (1)H and (13)C NMR in DMSO-d(6) solution and fast atom bombardment (FAB(+)) mass spectra. The expected coordination compounds, [Hg(adgha)](NO(3))(2) and [Hg(adgha)(2)](NO(3))(2), were observed as unstable intermediates that decompose to bis-[2-(d-glycero-d-gulo-hexahydroxyhexyl)-benzimidazole-κN]mercury(II) dinitrate, [Hg(ghbz)(2)](NO(3))(2). The chemical transformation of the complexes was followed by NMR experiments, and the nature of the species formed is sustained by a theoretical study done using DFT methodology. From this study, we propose the structure of the complexes formed in solution, the relative stability of the species formed, and the possible role of the solvent in the observed transformations.
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Affiliation(s)
- Margarita I Bernal-Uruchurtu
- Centro de Investigaciones Químicas, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Cuernavaca 62209, Mexico.
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Keith-Roach MJ. The speciation, stability, solubility and biodegradation of organic co-contaminant radionuclide complexes: a review. THE SCIENCE OF THE TOTAL ENVIRONMENT 2008; 396:1-11. [PMID: 18384838 DOI: 10.1016/j.scitotenv.2008.02.030] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2007] [Revised: 02/14/2008] [Accepted: 02/20/2008] [Indexed: 05/26/2023]
Abstract
The potential migration of radionuclides is of concern at contaminated land sites and, in the long term, waste repositories. Pathways of migration need to be characterised on a predictive level so that management decisions can be made with confidence. A pathway that is relatively poorly understood at present is radionuclide solubilisation due to complexation by organic complexing agents that are present in mixed radioactive wastes, and at radioactively contaminated land sites. Interactions of the complexing agents with radionuclides and the host environment, and the response to changes in the physicochemical conditions make their role far from simple to elucidate. In addition, chemical and biodegradation of the organic materials may be important. In this paper, key co-contaminant organics are reviewed with emphasis on their environmental fate and impact on radionuclide migration.
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Affiliation(s)
- Miranda J Keith-Roach
- Biogeochemistry and Environmental Analytical Chemistry Group/Consolidated Radio-isotope Facility, School of Earth, Ocean and Environmental Sciences, University of Plymouth, Drake Circus, Plymouth PL4 8AA, UK.
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21
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Dicko A, Tardi P, Xie X, Mayer L. Role of copper gluconate/triethanolamine in irinotecan encapsulation inside the liposomes. Int J Pharm 2007; 337:219-28. [PMID: 17270372 DOI: 10.1016/j.ijpharm.2007.01.004] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2006] [Revised: 12/12/2006] [Accepted: 01/03/2007] [Indexed: 10/23/2022]
Abstract
A novel method for encapsulating irinotecan into liposomes containing copper gluconate buffered to pH 7.0 with triethanolamine (TEA) has recently been developed. In the present study, the mechanism dictating drug encapsulation and retention inside those liposomes was investigated. Spectroscopic analyses revealed that irinotecan interacted with copper gluconate/TEA in solution. Fourier transformed infrared (FT-IR) spectroscopy indicated a strengthening of the hydrogen bonds involving the hydroxyl groups when solutions of irinotecan and copper gluconate/TEA are mixed at a 1:1 molar ratio. The intensity of the circular dichroism (CD) signal of copper gluconate/TEA increased in the presence of equimolar amounts of irinotecan. The addition of irinotecan to liposomes containing copper gluconate/TEA at 50 degrees C induced a shift of the absorption bands from 370 nm to 378 nm as well as a 60% quenching of the drug fluorescence at 440 nm suggesting the occurrence of irinotecan self association. Irinotecan encapsulation was found to be kinetically and stoichiometrically correlated with the release of TEA from the liposomes. The results suggested that the encapsulation of irinotecan was mediated by TEA in association with copper gluconate, leading to a final drug complex that is retained inside the liposomes. A neutral antiport exchange loading mechanism between irinotecan and TEA is proposed.
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Affiliation(s)
- Awa Dicko
- Celator Pharmaceuticals Corp., 1779 W 75th Avenue, Vancouver, BC V6P 6P2, Canada
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Stapley JA, BeMiller JN. The Ruff degradation: a review of previously proposed mechanisms with evidence that the reaction proceeds by a Hofer-Moest-type reaction. Carbohydr Res 2006; 342:407-18. [PMID: 17204258 DOI: 10.1016/j.carres.2006.12.002] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2006] [Revised: 11/20/2006] [Accepted: 12/05/2006] [Indexed: 11/25/2022]
Abstract
The Ruff degradation reaction is critically reviewed. Based on available information, the Hofer-Moest decarboxylation mechanism is presented as the mechanism for it. Cu(III) is proposed as the active species of the copper variant of the Ruff degradation, which is the most efficient form of the reaction.
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Affiliation(s)
- Jonathan A Stapley
- Whistler Center for Carbohydrate Research, Purdue University, 745 Agriculture Mall Drive, West Lafayette, IN 47906-2009, USA
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23
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Pezzotti F, Therisod M. Enzymatic synthesis of aldonic acids. Carbohydr Res 2006; 341:2290-2. [PMID: 16806132 DOI: 10.1016/j.carres.2006.05.023] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2006] [Revised: 05/19/2006] [Accepted: 05/25/2006] [Indexed: 11/29/2022]
Abstract
Several aldonic acids (D-mannonic, D-galactonic, D-xylonic, 2-deoxy-D-arabinohexonic (2-deoxy-D-gluconic)) were prepared on a scale of several grams by a simple oxidation catalyzed by glucose oxidase in pure water.
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Affiliation(s)
- F Pezzotti
- Laboratoire de Chimie Bioorganique et Bioinorganique, UMR 8182, ICMMO, Université Paris-Sud, 91405 Orsay, France
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24
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Allard S, Ekberg C. Complexing Properties of α-Isosaccharinate: Stability Constants, Enthalpies and Entropies of Th-complexation with Uncertainty Analysis. J SOLUTION CHEM 2006. [DOI: 10.1007/s10953-006-9048-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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25
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Ferrari E, Grandi R, Lazzari S, Saladini M. Hg(II)-coordination by sugar-acids: Role of the hydroxy groups. J Inorg Biochem 2005; 99:2381-6. [PMID: 16266751 DOI: 10.1016/j.jinorgbio.2005.09.005] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2005] [Revised: 09/06/2005] [Accepted: 09/15/2005] [Indexed: 11/30/2022]
Abstract
A solution study on the ability of some derivatised sugars [glucuronic acid (GluA), galacturonic acid (GalA) and glucosaminic acid (GlNA)] to complex the Hg(II) ion is reported. The stability constants of the complex species were determined by potentiometric measurements while (1)H NMR experiments allow to define the coordination sites of sugar molecules. GluA coordinates the metal ion through the carboxylic oxygen and the O-4 hydroxyl group and is found to form more stable complexes with respect to GalA in which metal ligation is from the carboxylic oxygen and the O-5 ring oxygen. GlNA forms stable complexes chelating Hg(II) ion through carboxylic oxygen and the alpha-amino group. The ternary 2,2'-bipyridine containing systems were also investigated by means of potentiometric studies. The ML(2) complexes were also isolated in the solid state and characterised by IR spectroscopy.
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Affiliation(s)
- E Ferrari
- Department of Chemistry, University of Modena and Reggio Emilia, via Campi 183, 41100 Modena, Italy
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26
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Gaidamauskas E, Norkus E, Vaiciūniene J, Crans DC, Vuorinen T, Jaciauskiene J, Baltrūnas G. Evidence of two-step deprotonation of d-mannitol in aqueous solution. Carbohydr Res 2005; 340:1553-6. [PMID: 15882852 DOI: 10.1016/j.carres.2005.03.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2004] [Revised: 03/24/2005] [Accepted: 03/24/2005] [Indexed: 11/29/2022]
Abstract
Deprotonation of D-mannitol was studied in aqueous basic solutions by means of potentiometry and (13)C NMR spectroscopy. Two-step dissociation in the pH range from 12 to 13.8 was shown, and successive dissociation constants K(a1) and K(a2) were determined. In a solution with ionic strength I = 1.0 M (NaOH + NaNO(3)) pK(a1) = 13.1 +/- 0.1 and pK(a2) = 13.8 +/- 0.2. With increasing ionic strength from 0.75 to 3.0 M, both pK(a1) and pK(a2) values decrease. Deprotonation-induced chemical shifts in pH-variable (13)C NMR spectra show that the OH-groups next to internal carbon atoms C-3 and C-4 dissociate to a greater extent compared to OH-groups next to external carbon atoms C-1 and C-6.
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27
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Gajda T, Düpre Y, Török I, Harmer J, Schweiger A, Sander J, Kuppert D, Hegetschweiler K. Highly efficient phosphodiester hydrolysis promoted by a dinuclear copper(II) complex. Inorg Chem 2001; 40:4918-27. [PMID: 11531440 DOI: 10.1021/ic0005902] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The interaction of Cu(II) with the ligand tdci (1,3,5-trideoxy-1,3,5-tris(dimethylamino)-cis-inositol) was studied both in the solid state and in solution. The complexes that were formed were also tested for phosphoesterase activity. The pentanuclear complex [Cu(5)(tdciH(-2))(tdci)(2)(OH)(2)(NO(3))(2)](NO(3))(4).6H(2)O consists of two dinuclear units and one trinuclear unit, having two shared copper(II) ions. The metal centers within the pentanuclear structure have three distinct coordination environments. All five copper(II) ions are linked by hydroxo/alkoxo bridges forming a Cu(5)O(6) cage. The Cu-Cu separations of the bridged centers are between 2.916 and 3.782 A, while those of the nonbridged metal ions are 5.455-5.712 A. The solution equilibria in the Cu(II)-tdci system proved to be extremely complicated. Depending on the pH and metal-to-ligand ratio, several differently deprotonated mono-, di-, and trinuclear complexes are formed. Their presence in solution was supported by mass, CW, and pulse EPR spectroscopic study, too. In these complexes, the metal ions are presumed to occupy tridentate [O(ax),N(eq),O(ax)] coordination sites and the O-donors of tdci may serve as bridging units between two metal ions. Additionally, deprotonation of the metal-bound water molecules may occur. The dinuclear Cu(2)LH(-3) species, formed around pH 8.5, provides outstanding rate acceleration for the hydrolysis of the activated phosphodiester bis(4-nitrophenyl)phosphate (BNPP). The second-order rate constant of BNPP hydrolysis promoted by the dinuclear complex (T = 298 K) is 0.95 M(-1) s(-1), which is ca. 47600-fold higher than that of the hydroxide ion catalyzed hydrolysis (k(OH)). Its activity is selective for the phosphodiester, and the hydrolysis was proved to be catalytic. The proposed bifunctional mechanism of the hydrolysis includes double Lewis acid activation and intramolecular nucleophilic catalysis.
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Affiliation(s)
- T Gajda
- Department of Inorganic and Analytical Chemistry, University of Szeged, P.O. Box 440, H-6701 Szeged, Hungary.
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28
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Burger K, Illés J, Gyurcsik B, Gazdag M, Forrai E, Dékány I, Mihályfi K. Metal ion coordination of macromolecular bioligands: formation of zinc(II) complex of hyaluronic acid. Carbohydr Res 2001; 332:197-207. [PMID: 11434378 DOI: 10.1016/s0008-6215(01)00065-9] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The coordination of zinc(II) ion to hyaluronate (Hya), a natural copolymer, in aqueous solution at pH 6 was investigated by potentiometric and circular dichroism (CD) spectroscopic methods, and by monitoring the changes in macroscopic properties by high-precision measurements. The zinc(II)-selective electrode, and CD measurements proved the binding of zinc(II) by Hya. A number of Hya fragments (Mr approximately 3.3 x 10(3)-1.4 x 10(6)) were studied to estimate the contributions of the polyelectrolyte effect, the solvation and host-guest interactions to the extra stabilization of the macromolecular zinc(II) complexes as compared with the monomeric unit. The zinc(II) ion activity increase reflected a stability decrease for the fragments with Mr < 4 x 10(4). This molecular weight differs from that where cleavage of the Hya skeleton starts (approximately 5 x 10(5), according to the size-exclusion gel, and anion-exchange chromatographic behavior of the Hya fragments) and from that where the polyelectrolyte effect stops (approximately 6 x 10(3)). The excess volumes and Bingham shear yield values of the solutions revealed the transformation of the coherent random coil structure stabilized by intermolecular association in the NaHya to an intramolecular association producing the globular structure of the ZnHya molecule, with a smaller but more strongly bound solvate water sheet.
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Affiliation(s)
- K Burger
- Department of Inorganic and Analytical Chemistry, Szeged University, Hungary
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29
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Luísa Ramos M, Caldeira MM, Gil VM. NMR study of the complexation of D-gulonic acid with tungsten(VI) and molybdenum(VI). Carbohydr Res 2000; 329:387-97. [PMID: 11117322 DOI: 10.1016/s0008-6215(00)00191-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
By using multinuclear (1H, 13C, 17O, 95Mo, 183W) magnetic resonance spectroscopy (1D and 2D), D-gulonic acid is found to form ten and seven complexes, respectively, with tungsten(VI) and molybdenum(VI), in aqueous solution, depending on pH and metal-ligand molar ratios. Two isomeric 1:2 (metal-ligand) complexes involving the carboxylate and the adjacent OH group are present in the pH range 2-9. At intermediate and high pH, molybdate forms a 2:1 tetradentate complex involving the four secondary hydroxyl groups, whereas tungstate forms one 2:1 terdentate species. At low and intermediate pH values, three 2:1 complexes are found for both metals, involving the carboxylate group and three secondary hydroxyl groups, as well as a 5:2 species involving the carboxylate group and all the secondary hydroxyl groups; the concentration of this species increases in time mainly at the expense of 2:1 and 1:2 complexes. Tungstate can also form two additional species, probably a 5:2 species involving the carboxylate group and all the hydroxyl groups, and a 2:1 pentadentate species involving the carboxylate group and all the secondary hydroxyl groups. In alkaline solutions, tungstate is able to form an additional 2:1 pentadentate complex involving all the hydroxyl groups.
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Affiliation(s)
- M Luísa Ramos
- Department of Chemistry, University of Coimbra, Portugal
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Absolute configurational assignment of α-hydroxy acids and α-hydroxy esters from their Cupra A circular dichroism spectra. ACTA ACUST UNITED AC 1999. [DOI: 10.1016/s0957-4166(99)00076-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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