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Volumn 38, Issue 1-3, 2012, Pages 245-253

Ionic liquid as a novel partitioning media

Author keywords

Crown ether; Density functional theory; Extraction; Ionic liquids; Molecular modeling; Partition coefficients

Indexed keywords


EID: 84857021171     PISSN: 19443994     EISSN: 19443986     Source Type: Journal    
DOI: 10.5004/dwt.2012.2542     Document Type: Article
Times cited : (8)

References (48)
  • 1
    • 0347417134 scopus 로고    scopus 로고
    • Room-temperature ionic liquids, solvents for synthesis and catalysis
    • T. Welton, Room-temperature ionic liquids, solvents for synthesis and catalysis, Chem. Rev., 99 (1999) 2071-2083.
    • (1999) Chem. Rev , vol.99 , pp. 2071-2083
    • Welton, T.1
  • 2
    • 0034583251 scopus 로고    scopus 로고
    • Ionic liquids, green solvents for the future
    • M.J. Earle and K.R. Seddon, Ionic liquids, green solvents for the future, Pure Appl. Chem., 72 (2000) 1391-1398.
    • (2000) Pure Appl. Chem , vol.72 , pp. 1391-1398
    • Earle, M.J.1    Seddon, K.R.2
  • 3
    • 77950157358 scopus 로고    scopus 로고
    • Extraction of organic compounds with room temperature ionic liquids
    • C.F. Poole and S.K. Poole, Extraction of organic compounds with room temperature ionic liquids, J. Chromatogr. A., 1217 (2010) 2268-2286.
    • (2010) J. Chromatogr. A , vol.1217 , pp. 2268-2286
    • Poole, C.F.1    Poole, S.K.2
  • 4
    • 38349122534 scopus 로고    scopus 로고
    • Toxicity and biodegradability of imidazolium ionic liquids
    • A. Romero, A. Santos, J. Tojo and A. Rodriguez, Toxicity and biodegradability of imidazolium ionic liquids, J. Hazard. Mater., 151 (2008) 268-273.
    • (2008) J. Hazard. Mater , vol.151 , pp. 268-273
    • Romero, A.1    Santos, A.2    Tojo, J.3    Rodriguez, A.4
  • 5
    • 79951723914 scopus 로고    scopus 로고
    • Toxicity of various anions associated with methoxyethyl methyl imidazolium-based ionic liquids on Clostridium sp
    • H. Wanga, S.V. Malhotra and A.J. Francis, Toxicity of various anions associated with methoxyethyl methyl imidazolium-based ionic liquids on Clostridium sp., Chemosphere, 82 (2011) 1597-1603.
    • (2011) Chemosphere , vol.82 , pp. 1597-1603
    • Wanga, H.1    Malhotra, S.V.2    Francis, A.J.3
  • 6
    • 33746199960 scopus 로고    scopus 로고
    • Ionic liquids as extraction solvents: Where do we stand?
    • M.L. Dietz, Ionic liquids as extraction solvents: Where do we stand? Sep. Sci. Technol., 41 (2006) 2047-2063.
    • (2006) Sep. Sci. Technol , vol.41 , pp. 2047-2063
    • Dietz, M.L.1
  • 7
    • 21844432372 scopus 로고    scopus 로고
    • Room temperature ionic liquids as novel media for 'clean' liquid-liquid extraction
    • J.G. Huddleston and R.D. Rogers, Room temperature ionic liquids as novel media for 'clean' liquid-liquid extraction, Chem. Commun., (1998) 1765-1766.
    • (1998) Chem. Commun , pp. 1765-1766
    • Huddleston, J.G.1    Rogers, R.D.2
  • 8
    • 0035510339 scopus 로고    scopus 로고
    • Ionic liquids: Innovative fluids for chemical processing
    • J.F. Brennecke and E.J. Maginn, Ionic liquids: Innovative fluids for chemical processing, AIChE J., 47 (2001) 2384-2389.
    • (2001) AIChE J , vol.47 , pp. 2384-2389
    • Brennecke, J.F.1    Maginn, E.J.2
  • 9
    • 4444318555 scopus 로고    scopus 로고
    • Solvent extraction of amino acids into a room temperature ionic liquid with dicyclohexano-18-crown-6
    • S. Smirnova, I.I. Torocheshnikova, A.A. Formanovsky and I.V. Pletnev, Solvent extraction of amino acids into a room temperature ionic liquid with dicyclohexano-18-crown-6, Anal. Chem. Biochem., 378 (2004) 1369-1375.
    • (2004) Anal. Chem. Biochem , vol.378 , pp. 1369-1375
    • Smirnova, S.1    Torocheshnikova, I.I.2    Formanovsky, A.A.3    Pletnev, I.V.4
  • 10
    • 17844365544 scopus 로고    scopus 로고
    • Recovery of amino acids by imidazolium based ionic liquids from aqueous media
    • J. Wang, Y. Pei, Y. Zhao and Z. Hu, Recovery of amino acids by imidazolium based ionic liquids from aqueous media, Green Chem., 7 (2005) 196-202.
    • (2005) Green Chem , vol.7 , pp. 196-202
    • Wang, J.1    Pei, Y.2    Zhao, Y.3    Hu, Z.4
  • 11
    • 33748844804 scopus 로고    scopus 로고
    • Solvent extraction of strontium nitrate by a crown ether using room-temperature ionic liquids
    • S. Dai, Y.H. Ju, and C.E. Barnes, Solvent extraction of strontium nitrate by a crown ether using room-temperature ionic liquids, J. Chem. Soc. Dalton Trans., (1999) 1201-1202.
    • (1999) J. Chem. Soc. Dalton Trans , pp. 1201-1202
    • Dai, S.1    Ju, Y.H.2    Barnes, C.E.3
  • 12
    • 33646050040 scopus 로고    scopus 로고
    • The coordination chemistry of actinides in ionic liquids: A review of experiment and simulation
    • V.A. Cocalia, K.E. Gutowski and R.D. Rogers, The coordination chemistry of actinides in ionic liquids: A review of experiment and simulation, Coord. Chem. Rev., 250 (2006) 755-764.
    • (2006) Coord. Chem. Rev , vol.250 , pp. 755-764
    • Cocalia, V.A.1    Gutowski, K.E.2    Rogers, R.D.3
  • 13
    • 0035417195 scopus 로고    scopus 로고
    • Influence of structural variation in room-temperature ionic liquids on the selectivity and efficiency of competitive alkali metal salt extraction by a crown ether
    • S. Chun, S.V. Dzyuba and R.A. Bartsch, Influence of structural variation in room-temperature ionic liquids on the selectivity and efficiency of competitive alkali metal salt extraction by a crown ether, Anal. Chem., 73 (2001) 3737-3741.
    • (2001) Anal. Chem , vol.73 , pp. 3737-3741
    • Chun, S.1    Dzyuba, S.V.2    Bartsch, R.A.3
  • 15
    • 0242432402 scopus 로고    scopus 로고
    • Uranyl coordination environment in hydro-phobic ionic liquids: An in situ investigation
    • A.E. Visser, M.P. Jensen, I. Laszak, K.L. Nash, G.R. Choppin and R.D. Rogers, Uranyl coordination environment in hydro-phobic ionic liquids: An in situ investigation, Inorg. Chem., 42 (2003) 2197-2199.
    • (2003) Inorg. Chem , vol.42 , pp. 2197-2199
    • Visser, A.E.1    Jensen, M.P.2    Laszak, I.3    Nash, K.L.4    Choppin, G.R.5    Rogers, R.D.6
  • 16
    • 0038148906 scopus 로고    scopus 로고
    • Room temperature ionic liquid as a novel medium for liquid/liquid extraction of metal ions
    • G.T. Wei, Z. Yang and C.J. Chen, Room temperature ionic liquid as a novel medium for liquid/liquid extraction of metal ions, Anal. Chim. Acta., 488 (2003) 183-192.
    • (2003) Anal. Chim. Acta , vol.488 , pp. 183-192
    • Wei, G.T.1    Yang, Z.2    Chen, C.J.3
  • 17
    • 2442673056 scopus 로고    scopus 로고
    • + based on room-temperature ionic liquids containing monoaza-substituted crown ethers
    • + based on room-temperature ionic liquids containing monoaza-substituted crown ethers, Anal. Chem., 76 (2004) 2773-2779.
    • (2004) Anal. Chem , vol.76 , pp. 2773-2779
    • Luo, H.1    Dai, S.2    Bonnesen, P.V.3
  • 18
    • 20444399193 scopus 로고    scopus 로고
    • Feasibility of ionic liquids as alternative separation media for industrial solvent extraction processes
    • K. Nakashima, F. Kubota, T. Maruyama and M. Goto, Feasibility of ionic liquids as alternative separation media for industrial solvent extraction processes, Ind. Eng. Chem. Res., 44 (2005) 4368-4372.
    • (2005) Ind. Eng. Chem. Res , vol.44 , pp. 4368-4372
    • Nakashima, K.1    Kubota, F.2    Maruyama, T.3    Goto, M.4
  • 19
    • 8144227915 scopus 로고    scopus 로고
    • Use of 1-alkyl-3-methylimidazolium hexafluorophosphate room temperature ionic liquids as chelate extraction solvent with 4,4,4-trifluoro-1- (2-t h ienyl) -1,3 - buta ned ione
    • N. Hirayama, M. Deguchi, H. Kawasumi and T. Honjo, Use of 1-alkyl-3-methylimidazolium hexafluorophosphate room temperature ionic liquids as chelate extraction solvent with 4,4,4-trifluoro-1- (2-t h ienyl) -1,3 - buta ned ione, Talanta, 65 (2005) 255-260.
    • (2005) Talanta , vol.65 , pp. 255-260
    • Hirayama, N.1    Deguchi, M.2    Kawasumi, H.3    Honjo, T.4
  • 20
    • 0035929785 scopus 로고    scopus 로고
    • Ion-exchange as a mode of cation transfer into room-temperature ionic liquids containing crown ethers: Implications for the 'greenness' of ionic liquids as diluents in liquid-liquid extraction
    • M.L. Dietz and J.A. Dzielawa, Ion-exchange as a mode of cation transfer into room-temperature ionic liquids containing crown ethers: Implications for the 'greenness' of ionic liquids as diluents in liquid-liquid extraction, Chem. Commun., (2001) 2124-2125.
    • (2001) Chem. Commun , pp. 2124-2125
    • Dietz, M.L.1    Dzielawa, J.A.2
  • 21
    • 0037063566 scopus 로고    scopus 로고
    • EXAFS investigations of the mechanism of facilitated ion transfer into a room-temperature ionic liquid
    • M.P. Jensen, J.A. Dzielawa, P. Rickert and M.L. Dietz, EXAFS investigations of the mechanism of facilitated ion transfer into a room-temperature ionic liquid, J. Am. Chem. Soc., 124 (2002) 10664-10665.
    • (2002) J. Am. Chem. Soc , vol.124 , pp. 10664-10665
    • Jensen, M.P.1    Dzielawa, J.A.2    Rickert, P.3    Dietz, M.L.4
  • 22
    • 0347720955 scopus 로고    scopus 로고
    • Influence of solvent structural variations on the mechanism of facilitated ion transfer into room-temperature ionic liquids
    • M.L. Dietz, J.A. Dzielawa, I. Laszak, B.A. Young and M.P. Jensen, Influence of solvent structural variations on the mechanism of facilitated ion transfer into room-temperature ionic liquids, Green Chem., 5 (2003) 682-685.
    • (2003) Green Chem , vol.5 , pp. 682-685
    • Dietz, M.L.1    Dzielawa, J.A.2    Laszak, I.3    Young, B.A.4    Jensen, M.P.5
  • 23
    • 31944442090 scopus 로고    scopus 로고
    • Fluorous ionic liquids as solvents for the liquid-liquid extraction of metal ions by macrocyclic polyethers
    • H. Heitzman, B.A. Young, D. J. Rausch, P. Rickert, D.C. Stepinski and M.L. Dietz, Fluorous ionic liquids as solvents for the liquid-liquid extraction of metal ions by macrocyclic polyethers, Talanta, 69 (2006) 527-531.
    • (2006) Talanta , vol.69 , pp. 527-531
    • Heitzman, H.1    Young, B.A.2    Rausch, D.J.3    Rickert, P.4    Stepinski, D.C.5    Dietz, M.L.6
  • 24
    • 52949109154 scopus 로고    scopus 로고
    • The relationship between ionic structure and viscosity in room-temperature ionic liquids
    • H. Li, M. Ibrahim, I. Agberemi and M.N. Kobrak, The relationship between ionic structure and viscosity in room-temperature ionic liquids, J. Chem. Phys., 129 (2008) 124507-124512.
    • (2008) J. Chem. Phys , vol.129 , pp. 124507-124512
    • Li, H.1    Ibrahim, M.2    Agberemi, I.3    Kobrak, M.N.4
  • 25
    • 33847159883 scopus 로고    scopus 로고
    • Application of density functional theory and vibrational spectroscopy toward the rational design of ionic liquids
    • S.A. Katsyuba, E.E. Zvereva, A. Vidis and P.J. Dyson, Application of density functional theory and vibrational spectroscopy toward the rational design of ionic liquids, J. Phys. Chem. A., 111 (2007) 352-370.
    • (2007) J. Phys. Chem. A , vol.111 , pp. 352-370
    • Katsyuba, S.A.1    Zvereva, E.E.2    Vidis, A.3    Dyson, P.J.4
  • 26
    • 0037123799 scopus 로고    scopus 로고
    • Gas phase model of an ionic liquid: Semiempirical and ab initio bonding and structure
    • Z. Meng, A. Dolle and W.R. Carper, Gas phase model of an ionic liquid: Semiempirical and ab initio bonding and structure, J. Mol. Struct.-THEOCHEM., 585 (2002) 119-128.
    • (2002) J. Mol. Struct.-THEOCHEM , vol.585 , pp. 119-128
    • Meng, Z.1    Dolle, A.2    Carper, W.R.3
  • 27
    • 0037716995 scopus 로고    scopus 로고
    • Use of ab initio calculations toward the rational design of room temperature ionic liquids
    • E.A. Turner, C.C. Pye and R.D. Singer, Use of ab initio calculations toward the rational design of room temperature ionic liquids, J. Phys. Chem. A, 107 (2003) 2277-2288.
    • (2003) J. Phys. Chem. A , vol.107 , pp. 2277-2288
    • Turner, E.A.1    Pye, C.C.2    Singer, R.D.3
  • 28
    • 33748264231 scopus 로고    scopus 로고
    • Hydrogen bonds in imidazolium ionic liquids
    • K. Dong, S. Zhang, D. Wang and X. Yao, Hydrogen bonds in imidazolium ionic liquids, J. Phys. Chem. A., 110 (2006) 9775-9782.
    • (2006) J. Phys. Chem. A , vol.110 , pp. 9775-9782
    • Dong, K.1    Zhang, S.2    Wang, D.3    Yao, X.4
  • 29
    • 34548839374 scopus 로고    scopus 로고
    • Prediction of macroscopic properties of protic ionic liquids by ab initio calculations
    • H. Markusson, J.P. Belieres, P. Johansson, C.A. Angell and P. Jacobsson, Prediction of macroscopic properties of protic ionic liquids by ab initio calculations, J. Phys. Chem. A., 111 (2007) 8717-8723.
    • (2007) J. Phys. Chem. A , vol.111 , pp. 8717-8723
    • Markusson, H.1    Belieres, J.P.2    Johansson, P.3    Angell, C.A.4    Jacobsson, P.5
  • 30
    • 41349119800 scopus 로고    scopus 로고
    • Electronic structures of ionic liquids [Cnmim] [BF4] and [Cnmim] [PF6] studied by ultraviolet photoemission, inverse photoemission, and near-edge X-ray absorption fine structure spectroscopies
    • T. Nishi, T. Iwahashi, H. Yamane, Y. Ouchi, K. Kanai and K. Seki, Electronic structures of ionic liquids [Cnmim] [BF4] and [Cnmim] [PF6] studied by ultraviolet photoemission, inverse photoemission, and near-edge X-ray absorption fine structure spectroscopies, Chem. Phys. Lett., 455 (2008) 213-217.
    • (2008) Chem. Phys. Lett , vol.455 , pp. 213-217
    • Nishi, T.1    Iwahashi, T.2    Yamane, H.3    Ouchi, Y.4    Kanai, K.5    Seki, K.6
  • 31
    • 77149156914 scopus 로고    scopus 로고
    • A COSMO-RS based guide to analyze/quantify the polarity of ionic liquids and their mixtures with organic cosolvents
    • J. Palomar, J. S. Torrecilla, J. Lemus, V.R. Ferroa, F. Rodríguez, A COSMO-RS based guide to analyze/quantify the polarity of ionic liquids and their mixtures with organic cosolvents, Phys. Chem. Chem. Phys., 12 (2010) 1991-2000.
    • (2010) Phys. Chem. Chem. Phys , vol.12 , pp. 1991-2000
    • Palomar, J.1    Torrecilla, J.S.2    Lemus, J.3    Ferroa, V.R.4    Rodríguez, F.5
  • 33
    • 65249111635 scopus 로고    scopus 로고
    • Linear free energy relationship correlations for room temperature ionic liquids: Revised cation-specific and anion-specific equation coeffi-cients for predictive applications covering a much larger area of chemical space
    • L.M. Sprunger, J. Gibbs, A. Proctor, W.E. Acree Jr., M.H. Abraham, Y. Meng, C. Yao and J.L. Anderson, Linear free energy relationship correlations for room temperature ionic liquids: Revised cation-specific and anion-specific equation coeffi-cients for predictive applications covering a much larger area of chemical space, Ind. Eng. Chem. Res., 48 (2009) 4145-4154.
    • (2009) Ind. Eng. Chem. Res , vol.48 , pp. 4145-4154
    • Sprunger, L.M.1    Gibbs, J.2    Proctor, A.3    Acree Jr., W.E.4    Abraham, M.H.5    Meng, Y.6    Yao, C.7    Anderson, J.L.8
  • 34
    • 33751157086 scopus 로고
    • Conductor-like screening model for real solvents: A new approach to the quantitative calculation of solvation phenomena
    • A. Klamt, Conductor-like screening model for real solvents: A new approach to the quantitative calculation of solvation phenomena, J. Phys. Chem., 99 (1995) 2224-2235.
    • (1995) J. Phys. Chem , vol.99 , pp. 2224-2235
    • Klamt, A.1
  • 35
    • 0036473751 scopus 로고    scopus 로고
    • Fast solvent screening via quantum chemistry: COSMO-RS approach
    • F. Eckert and A. Klamt, Fast solvent screening via quantum chemistry: COSMO-RS approach, AIChE J., 48 (2002) 369-85.
    • (2002) AIChE J , vol.48 , pp. 369-385
    • Eckert, F.1    Klamt, A.2
  • 37
    • 0038030978 scopus 로고    scopus 로고
    • Prediction of the mutual solubilities of hydrocarbons and water with COSMO-RS
    • A. Klamt, Prediction of the mutual solubilities of hydrocarbons and water with COSMO-RS, Fluid Phase Equilibr., 206 (2003) 223-235.
    • (2003) Fluid Phase Equilibr , vol.206 , pp. 223-235
    • Klamt, A.1
  • 38
    • 71849108283 scopus 로고    scopus 로고
    • Partition coefficients of macrocyclic crown ethers in water-organic biphasic system: DFT/COSMO-RS approach
    • A. Boda, Sk.M. Ali and M.R.K. Shenoi, Partition coefficients of macrocyclic crown ethers in water-organic biphasic system: DFT/COSMO-RS approach, Fluid Phase Equilibr., 288 (2010) 111-120.
    • (2010) Fluid Phase Equilibr , vol.288 , pp. 111-120
    • Boda, A.1    Ali, S.M.2    Shenoi, M.R.K.3
  • 39
    • 0004267033 scopus 로고    scopus 로고
    • Release01.08; COSMOlogic GmbH & Co, KG, Leverkusen, Germany
    • F. Eckert and A. Klamt, COSMOtherm, version C2.1, Release01.08; COSMOlogic GmbH & Co, KG, Leverkusen, Germany, 2008.
    • (2008) COSMOtherm, Version C2.1
    • Eckert, F.1    Klamt, A.2
  • 41
    • 84856978558 scopus 로고    scopus 로고
    • TURBOMOLE V6.0 2009, a development of University of Karlsruhe and Forschungszentrum Karlsruhe GmbH, 1989-2007, TURBOMOLE GmbH, since
    • TURBOMOLE V6.0 2009, a development of University of Karlsruhe and Forschungszentrum Karlsruhe GmbH, 1989-2007, TURBOMOLE GmbH, since 2007.
    • (2007)
  • 42
    • 0033963034 scopus 로고    scopus 로고
    • Molden: A pre- and postprocessing program for molecular and electronic structures
    • G. Schaftenaar and J.H. Noordik, Molden: A pre- and postprocessing program for molecular and electronic structures, J. Comput. -Aided Mol. Des., 14 (2000) 123-134.
    • (2000) J. Comput. -Aided Mol. Des , vol.14 , pp. 123-134
    • Schaftenaar, G.1    Noordik, J.H.2
  • 43
    • 4644257493 scopus 로고    scopus 로고
    • Ionic liquids/water distribution ratios of some polycyclic aromatic hydrocarbons
    • J. Liu, Y. Chi, J. Peng, G. Jiang and J. Jonson, Ionic liquids/water distribution ratios of some polycyclic aromatic hydrocarbons, J. Chem. Eng. Data., 49 (2004) 1422-1424.
    • (2004) J. Chem. Eng. Data , vol.49 , pp. 1422-1424
    • Liu, J.1    Chi, Y.2    Peng, J.3    Jiang, G.4    Jonson, J.5
  • 44
    • 0034306167 scopus 로고    scopus 로고
    • Traditional extractants in nontraditional solvents: Groups 1 and 2 extraction by crown ethers in room-temperature ionic liquids
    • A.E. Vissers, R.P. Swatloski, W.M. Reichert, S.T. Griffin and R.D. Rogers, Traditional extractants in nontraditional solvents: Groups 1 and 2 extraction by crown ethers in room-temperature ionic liquids, Ind. Eng. Chem. Res., 39 (2000) 3596-3604.
    • (2000) Ind. Eng. Chem. Res , vol.39 , pp. 3596-3604
    • Vissers, A.E.1    Swatloski, R.P.2    Reichert, W.M.3    Griffin, S.T.4    Rogers, R.D.5
  • 45
    • 50949084044 scopus 로고    scopus 로고
    • Ligands for selective metal ion extraction: A molecular modeling approach
    • S.M. Ali, D.K. Maity, S. De and M.R.K. Shenoi, Ligands for selective metal ion extraction: A molecular modeling approach, Desalination, 232 (2008) 181-190.
    • (2008) Desalination , vol.232 , pp. 181-190
    • Ali, S.M.1    Maity, D.K.2    De, S.3    Shenoi, M.R.K.4
  • 46
    • 77954390629 scopus 로고    scopus 로고
    • Conformational effect on the preferential binding of alkali metal cation with crown ether: A molecular level investigation
    • S. De, Sk.M. Ali, M.R.K. Shenoi, S.K. Ghosh and D.K. Maity, Conformational effect on the preferential binding of alkali metal cation with crown ether: A molecular level investigation, Desalin. Water Treat., 12 (2009) 93-99.
    • (2009) Desalin. Water Treat , vol.12 , pp. 93-99
    • De, S.1    Ali, S.M.2    Shenoi, M.R.K.3    Ghosh, S.K.4    Maity, D.K.5
  • 47
    • 73749085920 scopus 로고    scopus 로고
    • Preferential interaction of charged alkali metal ions (guest) within a narrow cavity of cyclic crown ethers (neutral host): A quantum chemical investigation
    • S. De, A. Boda and Sk.M. Ali, Preferential interaction of charged alkali metal ions (guest) within a narrow cavity of cyclic crown ethers (neutral host): A quantum chemical investigation, J. Mol. Struct.-THEOCHEM., 941 (2010) 90-101.
    • (2010) J. Mol. Struct.-THEOCHEM , vol.941 , pp. 90-101
    • De, S.1    Boda, A.2    Ali, S.M.3
  • 48
    • 37849038412 scopus 로고    scopus 로고
    • Desulfurisation of oils using ionic liquids: Selection of cationic and anionic components to enhance extraction efficiency
    • J.D. Holbrey, I. Lopez-Martin, G. Rothenberg, K.R. Seddon, G. Silveroc and X. Zheng, Desulfurisation of oils using ionic liquids: Selection of cationic and anionic components to enhance extraction efficiency, Green Chem., 10 (2008) 87-92.
    • (2008) Green Chem , vol.10 , pp. 87-92
    • Holbrey, J.D.1    Lopez-Martin, I.2    Rothenberg, G.3    Seddon, K.R.4    Silveroc, G.5    Zheng, X.6


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