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Sudarvizhi V, Balakrishnan T, Percino MJ, Stoeckli-Evans H, Thamotharan S. Evaluation of charge assisted hydrogen bonds in L-(S)-lysinium L-(S)-mandelate dihydrate and L-(S)-alanine L-(S)-mandelic acid complexes: Inputs from Hirshfeld surface, PIXEL energy and QTAIM analysis. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2020.128701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Izadyar A. Stripping Voltammetry at the Interface between two Immiscible Electrolyte Solutions: A Review Paper. ELECTROANAL 2018. [DOI: 10.1002/elan.201800279] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Anahita Izadyar
- Department of Chemistry and Physics; Arkansas State University, PO Box 419; State University; AR 72467 USA
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Serial MR, Velasco MI, Silletta EV, Zanotto FM, Dassie SA, Acosta RH. Flow-Pattern Characterization of Biphasic Electrochemical Cells by Magnetic Resonance Imaging under Forced Hydrodynamic Conditions. Chemphyschem 2017; 18:3469-3477. [PMID: 28960697 DOI: 10.1002/cphc.201700775] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2017] [Indexed: 11/06/2022]
Abstract
The fluid dynamics of a liquid|liquid system inside a four-electrode electrochemical cell were studied by velocimetry magnetic resonance imaging (MRI) and flow propagator measurements. To characterize this system fully, three different cell configurations operating at two rotational frequencies were analyzed. Quantitative information about the stability of the liquid|liquid interface and the dynamics of the organic phase were determined. The NMR spectroscopy results were in agreement with the electrochemical measurements performed by using the same experimental setup.
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Affiliation(s)
- María R Serial
- FAMAF-Universidad Nacional de Córdoba and IFEG-CONICET, 5000, Ciudad Universitaria, Córdoba, Argentina
| | - Manuel I Velasco
- FAMAF-Universidad Nacional de Córdoba and IFEG-CONICET, 5000, Ciudad Universitaria, Córdoba, Argentina
| | - Emilia V Silletta
- FAMAF-Universidad Nacional de Córdoba and IFEG-CONICET, 5000, Ciudad Universitaria, Córdoba, Argentina
| | - Franco M Zanotto
- Universidad Nacional de Córdoba, Instituto de Investigaciones en Fisicoquímica de córdoba (INFIQC)-CONICET, Departamento de Fisicoquímica, Facultad de Ciencias Químicas, 5000, Ciudad Universitari, Córdoba, Argentina
| | - Sergio A Dassie
- Universidad Nacional de Córdoba, Instituto de Investigaciones en Fisicoquímica de córdoba (INFIQC)-CONICET, Departamento de Fisicoquímica, Facultad de Ciencias Químicas, 5000, Ciudad Universitari, Córdoba, Argentina
| | - Rodolfo H Acosta
- FAMAF-Universidad Nacional de Córdoba and IFEG-CONICET, 5000, Ciudad Universitaria, Córdoba, Argentina
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Vega Mercado F, Ovejero J, Zanotto F, Serial M, Velasco M, Fernández R, Acosta R, Dassie S. Facilitated proton transfer across liquid | liquid interfaces under forced hydrodynamic conditions. Determination of partition coefficients of neutral weak bases. J Electroanal Chem (Lausanne) 2017. [DOI: 10.1016/j.jelechem.2017.03.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Vega Mercado F, Ovejero JM, Fernández RA, Dassie SA. Effect of ligand protonation on the facilitated ion transfer reactions across oil|water interfaces. V. Applications of forced hydrodynamic conditions. J Electroanal Chem (Lausanne) 2016. [DOI: 10.1016/j.jelechem.2015.08.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Minkov VS, Ghazaryan VV, Boldyreva EV, Petrosyan AM. Unusual hydrogen bonding in L-cysteine hydrogen fluoride. ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY 2015; 71:733-41. [PMID: 26243424 DOI: 10.1107/s2053229615013601] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2015] [Accepted: 07/16/2015] [Indexed: 11/10/2022]
Abstract
L-Cysteine hydrogen fluoride, or bis(L-cysteinium) difluoride-L-cysteine-hydrogen fluoride (1/1/1), 2C3H8NO2S(+)·2F(-)·C3H7NO2S·HF or L-Cys(+)(L-Cys···L-Cys(+))F(-)(F(-)...H-F), provides the first example of a structure with cations of the 'triglycine sulfate' type, i.e. A(+)(A···A(+)) (where A and A(+) are the zwitterionic and cationic states of an amino acid, respectively), without a doubly charged counter-ion. The salt crystallizes in the monoclinic system with the space group P2(1). The dimeric (L-Cys···L-Cys(+)) cation and the dimeric (F(-)···H-F) anion are formed via strong O-H···O or F-H···F hydrogen bonds, respectively, with very short O···O [2.4438 (19) Å] and F···F distances [2.2676 (17) Å]. The F···F distance is significantly shorter than in solid hydrogen fluoride. Additionally, there is another very short hydrogen bond, of O-H···F type, formed by a L-cysteinium cation and a fluoride ion. The corresponding O···F distance of 2.3412 (19) Å seems to be the shortest among O-H···F and F-H···O hydrogen bonds known to date. The single-crystal X-ray diffraction study was complemented by IR spectroscopy. Of special interest was the spectral region of vibrations related to the above-mentioned hydrogen bonds.
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Affiliation(s)
- V S Minkov
- Novosibirsk State University, Pirogova 2, Novosibirsk 630090, Russian Federation
| | - V V Ghazaryan
- Institute of Applied Problems of Physics, NAS of Armenia, 25 Nersessyan Str., 0014 Yerevan, Armenia
| | - E V Boldyreva
- Novosibirsk State University, Pirogova 2, Novosibirsk 630090, Russian Federation
| | - A M Petrosyan
- Institute of Applied Problems of Physics, NAS of Armenia, 25 Nersessyan Str., 0014 Yerevan, Armenia
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Velický M, Tam KY, Dryfe RA. Mechanism of ion transfer in supported liquid membrane systems: electrochemical control over membrane distribution. Anal Chem 2014; 86:435-42. [PMID: 24299270 PMCID: PMC3917230 DOI: 10.1021/ac402328w] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2013] [Accepted: 12/03/2013] [Indexed: 11/29/2022]
Abstract
A polarization study carried out on a thin supported liquid membrane separating two aqueous compartments is presented. Transfer of both the ionized and uncharged form of an organic tracer dye, rhodamine B ([9-(2-carboxyphenyl)-6-diethylamino-3-xanthenylidene]-diethylammonium chloride), across supported liquid membranes composed of one of 1-octanol (octan-1-ol), 1,9-decadiene (deca-1,9-diene), 1,2-dichlorobenzene, or nitrophenyl octyl ether (1-(2-nitrophenoxy)octane) was studied using cyclic voltammetry and UV-vis absorption spectrophotometry. Concentration analysis indicates that the high membrane concentration of rhodamine B determines the ionic transfer observed via voltammetry, which is consistent with the low aqueous ionic concentration and large membrane/aqueous distribution of the molecule. The observed double-transfer voltammogram, although it has been largely neglected in previous literature, is a logical consequence of the presence of two liquid-liquid interfaces and is rationalized in terms of ion transfer across the two interfaces on either side of the membrane and supported by voltammograms obtained for a series of ions of varied lipophilicity. The bipolar nature of the voltammetric response offers an effective way of mass transport control via changing polarity of the applied voltage and finds immediate use in extraction, purification, and separation applications.
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Affiliation(s)
- Matěj Velický
- School
of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, United
Kingdom
| | - Kin Y. Tam
- Faculty
of Health Science, University of Macau, Macau, China
| | - Robert A.W. Dryfe
- School
of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, United
Kingdom
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Hydrodynamic voltammetry at the liquid–liquid interface: Application to the transfer of ionised drug molecules. J Electroanal Chem (Lausanne) 2012. [DOI: 10.1016/j.jelechem.2012.07.037] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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9
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Ovejero JM, Fernández RA, Dassie SA. Ion transfer across liquid|liquid interface under forced hydrodynamic conditions. I: Digital simulations. J Electroanal Chem (Lausanne) 2012. [DOI: 10.1016/j.jelechem.2011.11.028] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Abstract
The main aspects related to the charge transfer reactions occurring at the interface between two immiscible electrolyte solutions (ITIES) are described. The particular topics to be discussed involve simple ion transfer. Focus is given on theoretical approaches, numerical simulations, and experimental methodologies. Concerning the theoretical procedures, different computational simulations related to simple ion transfer are reviewed. The main conclusions drawn from the most accepted models are described and analyzed in regard to their relevance for explaining different aspects of ion transfer. We describe numerical simulations implementing different approaches for solving the differential equations associated with the mass transport and charge transfer. These numerical simulations are correlated with selected experimental results; their usefulness in designing new experiments is summarized. Finally, many practical applications can be envisaged regarding the determination of physicochemical properties, electroanalysis, drug lipophilicity, and phase-transfer catalysis.
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Minkov VS, Tumanov NA, Cabrera RQ, Boldyreva EV. Low temperature/high pressure polymorphism in dl-cysteine. CrystEngComm 2010. [DOI: 10.1039/c003617j] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Kim Y, Amemiya S. Stripping analysis of nanomolar perchlorate in drinking water with a voltammetric ion-selective electrode based on thin-layer liquid membrane. Anal Chem 2008; 80:6056-65. [PMID: 18613700 DOI: 10.1021/ac8008687] [Citation(s) in RCA: 103] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A highly sensitive analytical method is required for the assessment of nanomolar perchlorate contamination in drinking water as an emerging environmental problem. We developed the novel approach based on a voltammetric ion-selective electrode to enable the electrochemical detection of "redox-inactive" perchlorate at a nanomolar level without its electrolysis. The perchlorate-selective electrode is based on the submicrometer-thick plasticized poly(vinyl chloride) membrane spin-coated on the poly(3-octylthiophene)-modified gold electrode. The liquid membrane serves as the first thin-layer cell for ion-transfer stripping voltammetry to give low detection limits of 0.2-0.5 nM perchlorate in deionized water, commercial bottled water, and tap water under a rotating electrode configuration. The detection limits are not only much lower than the action limit (approximately 246 nM) set by the U.S. Environmental Protection Agency but also are comparable to the detection limits of the most sensitive analytical methods for detecting perchlorate, that is, ion chromatography coupled with a suppressed conductivity detector (0.55 nM) or electrospray ionization mass spectrometry (0.20-0.25 nM). The mass transfer of perchlorate in the thin-layer liquid membrane and aqueous sample as well as its transfer at the interface between the two phases were studied experimentally and theoretically to achieve the low detection limits. The advantages of ion-transfer stripping voltammetry with a thin-layer liquid membrane against traditional ion-selective potentiometry are demonstrated in terms of a detection limit, a response time, and selectivity.
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Affiliation(s)
- Yushin Kim
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania 15260, USA
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A dimeric copper coumarin complex: synthesis and crystal structure of [{Cu(4-methyl-7-(salicylideneamino)coumarin)2}2]. OPEN CHEM 2008. [DOI: 10.2478/s11532-008-0018-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
AbstractA binuclear copper complex [{Cu(L)2}2], C68H48Cu2N4O12C (where L is 4-methyl-7-(salicylideneamino)coumarin), has been synthesized and characterized using elemental analysis, molar conductance measurements, and infrared, ultraviolet and ESR spectrosopy. The molecular structure of title compound, determined by single-crystal X-ray diffraction studies, reveals that the two symmetric Cu(L)2 units are associated into a dimer by rather long Cu...O bonds. The Cu(II) ions are bridged via the phenolic oxygen of one of the monomers and have distorted trigonal bipyramidal conformation geometry. Within each monomer the two methylsubstituted coumarin skeletons are trans to one another, but adopt a parallel arrangement with respect to the other monomer. Only half of the complex molecule can be found in the asymmetric unit, Z′ = 0.5, the other half is generated by the symmetry centre.
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