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Mohammadzadeh Kakhki R. Application of crown ethers as stationary phase in the chromatographic methods. J INCL PHENOM MACRO 2012. [DOI: 10.1007/s10847-012-0158-0] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Boda A, Ali SM, Shenoi MRK, Rao H, Ghosh SK. DFT modeling on the suitable crown ether architecture for complexation with Cs⁺ and Sr²⁺ metal ions. J Mol Model 2010; 17:1091-108. [PMID: 20676707 DOI: 10.1007/s00894-010-0812-7] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2010] [Accepted: 07/14/2010] [Indexed: 12/01/2022]
Abstract
Crown ether architectures were explored for the inclusion of Cs(+) and Sr(2+) ions within nano-cavity of macrocyclic crown ethers using density functional theory (DFT) modeling. The modeling was undertaken to gain insight into the mechanism of the complexation of Cs(+) and Sr(2+) ion with this ligand experimentally. The selectivity of Cs(+) and Sr(2+) ions for a particular size of crown ether has been explained based on the fitting and binding interaction of the guest ions in the narrow cavity of crown ethers. Although, Di-Benzo-18-Crown-6 (DB18C6) and Di-Benzo-21-Crown-7 (DB21C7) provide suitable host architecture for Sr(2+) and Cs(+) ions respectively as the ion size match with the cavity of the host, but consideration of binding interaction along with the cavity matching both DB18C6 and DB21C7 prefers Sr(2+) ion. The calculated values of binding enthalpy of Cs metal ion with the crown ethers were found to be in good agreement with the experimental results. The gas phase binding enthalpy for Sr(2+) ion with crown ether was higher than Cs metal ion. The ion exchange reaction between Sr and Cs always favors the selection of Sr metal ion both in the gas and in micro-solvated systems. The gas phase selectivity remains unchanged in micro-solvated phase. We have demonstrated the effect of micro-solvation on the binding interaction between the metal ions (Cs(+) and Sr(2+)) and the macrocyclic crown ethers by considering micro-solvated metal ions up to eight water molecules directly attached to the metal ion and also by considering two water molecules attached to metal-ion-crown ether complexes. A metal ion exchange reaction involving the replacement of strontium ion in metal ion-crown ether complexes with cesium ion contained within a metal ion-water cluster serves as the basis for modeling binding preferences in solution. The calculated O-H stretching frequency of H(2)O molecule in micro-solvated metal ion-crown complexes is more red-shifted in comparison to hydrated metal ions. The calculated IR spectra can be compared with an experimental spectrum to determine the presence of micro-solvated metal ion-crown ether complexes in extractant phase.
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Affiliation(s)
- Anil Boda
- Chemical Engineering Group, Bhabha Atomic Research center, Mumbai 400085, India
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Korchowiec J, Korchowiec B, Priebe W, Rogalska E. DFT Study on the Selectivity of Complexation of Metal Cations with a Dioxadithia Crown Ether Ligand. J Phys Chem A 2008; 112:13633-40. [DOI: 10.1021/jp8066052] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jacek Korchowiec
- Department of Theoretical Chemistry and Department of Physical Chemistry and Electrochemistry, Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Krakow, Poland, The University of Texas M. D. Anderson Cancer Center, Houston, Texas 77030, and Structure et Réactivité des Systèmes Moléculaires Complexes, BP 239, CNRS/Nancy Université, 54506 Vandoeuvre-lès-Nancy cedex, France
| | - Beata Korchowiec
- Department of Theoretical Chemistry and Department of Physical Chemistry and Electrochemistry, Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Krakow, Poland, The University of Texas M. D. Anderson Cancer Center, Houston, Texas 77030, and Structure et Réactivité des Systèmes Moléculaires Complexes, BP 239, CNRS/Nancy Université, 54506 Vandoeuvre-lès-Nancy cedex, France
| | - Waldemar Priebe
- Department of Theoretical Chemistry and Department of Physical Chemistry and Electrochemistry, Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Krakow, Poland, The University of Texas M. D. Anderson Cancer Center, Houston, Texas 77030, and Structure et Réactivité des Systèmes Moléculaires Complexes, BP 239, CNRS/Nancy Université, 54506 Vandoeuvre-lès-Nancy cedex, France
| | - Ewa Rogalska
- Department of Theoretical Chemistry and Department of Physical Chemistry and Electrochemistry, Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Krakow, Poland, The University of Texas M. D. Anderson Cancer Center, Houston, Texas 77030, and Structure et Réactivité des Systèmes Moléculaires Complexes, BP 239, CNRS/Nancy Université, 54506 Vandoeuvre-lès-Nancy cedex, France
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Corvis Y, Korchowiec B, Korchowiec J, Badis M, Mironiuk-Puchalska E, Fokt I, Priebe W, Rogalska E. Complexation of metal ions in Langmuir films formed with two amphiphilic dioxadithia crown ethers. J Phys Chem B 2008; 112:10953-63. [PMID: 18698707 DOI: 10.1021/jp803072b] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The two new crown ethers presented in this study were synthesized in order to investigate two important features of ionophores, namely metal cation complexation and interfacial properties, and the way in which they interrelate. The two derivatives were conceived as analogs of membrane phospholipids with respect to their amphiphilicity and geometry. They contain a hydrophilic 1,1'-dioxo-3,3'-dithio-14-crown ether headgroup and bear two myristoyl or stearoyl lateral chains. The length of the myristoyl and stearoyl derivatives in an extended conformation is comparable with the thickness of the individual leaflets of cell membranes. The membrane-related and complexation properties of the two crown ether derivatives were studied in monomolecular films spread on pure water and on aqueous solutions of mono-, di-, and trivalent metal salts. The properties of the monolayers are described quantitatively using thermodynamic models. The compression isotherms of the monolayers formed on different subphases show a clear-cut differentiation of the monovalent and di- or trivalent cations with both ligands. This differentiation was interpreted in terms of conformational changes occurring in the crown ether derivatives upon complexation. Molecular modeling indicates that the mono- and divalent cations are coordinated differently by the ligands, yielding complexes with different conformations. The differences of the conformations of the mono- and di- or trivalent cation complexes may be important from the point of view of the interactions with lipid membranes and the biological activity of these potential ionophores.
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Affiliation(s)
- Yohann Corvis
- Groupe d'Etude des Vecteurs Supramoléculaires du Médicament, Faculté des Sciences, BP 239, UMR 7565 CNRS/Nancy Université, 54506 Vandoeuvre-lès-Nancy cedex, France
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Manolescu C, Grinberg M, Field C, Ma S, Shen S, Lee H, Wang Y, Granger A, Chen Q, McCaffrey J, Norwood D, Grinberg N. Studies of the Interactions of Amino Alcohols Using High Performance Liquid Chromatography with Crown Ether Stationary Phases. J LIQ CHROMATOGR R T 2008. [DOI: 10.1080/10826070802279285] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- C. Manolescu
- a Analytical Sciences Department , Boehringer-Ingelheim Pharmaceuticals , Ridgefield, Connecticut, USA
| | - M. Grinberg
- b Brandeis University , Waltham, Massachusetts, USA
| | - C. Field
- a Analytical Sciences Department , Boehringer-Ingelheim Pharmaceuticals , Ridgefield, Connecticut, USA
| | - S. Ma
- c Chemical Development Department , Boehringer-Ingelheim Pharmaceuticals , Ridgefield, Connecticut, USA
| | - S. Shen
- c Chemical Development Department , Boehringer-Ingelheim Pharmaceuticals , Ridgefield, Connecticut, USA
| | - H. Lee
- c Chemical Development Department , Boehringer-Ingelheim Pharmaceuticals , Ridgefield, Connecticut, USA
| | - Y. Wang
- a Analytical Sciences Department , Boehringer-Ingelheim Pharmaceuticals , Ridgefield, Connecticut, USA
| | - A. Granger
- a Analytical Sciences Department , Boehringer-Ingelheim Pharmaceuticals , Ridgefield, Connecticut, USA
| | - Q. Chen
- a Analytical Sciences Department , Boehringer-Ingelheim Pharmaceuticals , Ridgefield, Connecticut, USA
| | - J. McCaffrey
- a Analytical Sciences Department , Boehringer-Ingelheim Pharmaceuticals , Ridgefield, Connecticut, USA
| | - D. Norwood
- a Analytical Sciences Department , Boehringer-Ingelheim Pharmaceuticals , Ridgefield, Connecticut, USA
| | - N. Grinberg
- c Chemical Development Department , Boehringer-Ingelheim Pharmaceuticals , Ridgefield, Connecticut, USA
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Abstract
Evaporative light-scattering detection (ELSD) is widely applied in the HPLC analysis of organic compounds lacking a UV chromophore. However, this detection method is generally unsuitable for determination of enantiomeric ratios (er). The er calculated from a UV trace and an ELS trace of the same compound differs significantly. Because of the nonlinear concentration response of the ELS detector, a compound with an er of 95:5 appears to be enantiomerically pure by ELS detection. It is possible to obtain a calibration curve and to calculate a correction factor, but this procedure is time consuming and therefore not very practical for routine analyses. In contrast, a charged aerosol detector allows a very accurate determination of the enantiomeric ratios. Like the ELS detection, the CA detection is independent of the chromophore properties of the substrate. Therefore, we recommend the use of CA instead of ELS detection for determination of the enantiomeric ratios of non-UV active compounds.
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Affiliation(s)
- Peter Wipf
- Center for Chemical Methodologies and Library Development (UPCMLD), University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA.
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Liu Y, Grinberg N, Thompson K, Wenslow R, Neue U, Morrison D, Walter T, O’Gara J, Wyndham K. Evaluation of a C18 hybrid stationary phase using high-temperature chromatography. Anal Chim Acta 2005. [DOI: 10.1016/j.aca.2005.08.026] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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