1
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Xu Y, Yuan Z, Meng Q, Zhao X, Du Y. Enhancing the flotation performance of ilmenite with the magnetic treatment of water. SEP SCI TECHNOL 2022. [DOI: 10.1080/01496395.2021.1884879] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Yuankai Xu
- College of Resources and Civil Engineering, Northeastern University, Shenyang, China
| | - Zhitao Yuan
- College of Resources and Civil Engineering, Northeastern University, Shenyang, China
| | - Qingyou Meng
- College of Resources and Civil Engineering, Northeastern University, Shenyang, China
| | - Xuan Zhao
- College of Resources and Civil Engineering, Northeastern University, Shenyang, China
| | - Yusheng Du
- College of Resources and Civil Engineering, Northeastern University, Shenyang, China
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2
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Baum M, Rieutord F, Juranyi F, Rey C, Rébiscoul D. Dynamical and Structural Properties of Water in Silica Nanoconfinement: Impact of Pore Size, Ion Nature, and Electrolyte Concentration. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:10780-10794. [PMID: 31345036 DOI: 10.1021/acs.langmuir.9b01434] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
In this study, we characterized the structure and the dynamics at a picosecond scale of water molecules in aqueous solutions with cations having various kosmotropic properties (XCl2 where X = Ba2+, Ca2+, and Mg2+) confined in highly ordered mesoporous silica (MCM-41 and grafted MCM-41) by Fourier transform infrared spectroscopy and quasi-elastic neutron scattering. We pinpointed the critical pore size and the electrolyte concentration at which the influence of the ion nature becomes the main factor affecting the water properties. These results suggest that whatever the ions kosmotropic properties, for pore sizes ϕp < 2.6 nm and [XCl2] ≤ 1 M, the water dynamics is mainly slowed down by the size of the confinement. For pore sizes of 6.6 nm, the water dynamics depends on the concentration and kosmotropic properties of the ion more than on the confinement. The water properties within the interfacial layer were also assessed and related to the surface ion excesses obtained by sorption isotherms. We showed that, for pore sizes ϕp ≥ 2.6 nm, the surface ion excess at the pore surface is the main driver affecting the structural properties of water molecules and their dynamics within the interfacial layer.
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Affiliation(s)
- Markus Baum
- CEA, ICSM - UMR 5257 CEA-CNRS-UM-ENSCM , 30207 Bagnols-sur-Cèze Cedex, France
| | | | - Fanni Juranyi
- Paul-Scherrer-Institute , 5232 Villigen PSI, Switzerland
| | - Cyrielle Rey
- CEA, ICSM - UMR 5257 CEA-CNRS-UM-ENSCM , 30207 Bagnols-sur-Cèze Cedex, France
| | - Diane Rébiscoul
- CEA, ICSM - UMR 5257 CEA-CNRS-UM-ENSCM , 30207 Bagnols-sur-Cèze Cedex, France
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3
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Max JJ, Larouche P, Chapados C. Orthogonalyzed H 2 O and D 2 O species obtained from infrared spectra of liquid water at several temperatures. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.07.084] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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4
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Venuti V, Stancanelli R, Acri G, Crupi V, Paladini G, Testagrossa B, Tommasini S, Ventura CA, Majolino D. “Host-guest” interactions in Captisol®/Coumestrol inclusion complex: UV–vis, FTIR-ATR and Raman studies. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.06.054] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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5
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Venuti V, Rossi B, Crupi V, D'Amico F, Gessini A, Majolino D, Masciovecchio C, Stancanelli R, Ventura CA. Solute-Solvent Interactions in Aqueous Solutions of Sulfobutyl Ether-β-cyclodextrin As Probed by UV-Raman and FTIR-ATR Analysis. J Phys Chem B 2016; 120:3746-53. [PMID: 27043008 DOI: 10.1021/acs.jpcb.6b02261] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
A vibrational study by means of UV-Raman and FTIR-ATR measurements has been performed on sulfobutyl ether β-cyclodextrin (SBE-β-CD)-water solutions, as a function of concentration and temperature, with the aim to provide a molecular-scale explanation of the enhanced performances as carrier agent exhibited by this modified macrocycle with respect to natural cyclodextrin. The attention has been mainly paid to the modifications induced on the vibrational band assigned to the O-H stretching intramolecular mode, in turn related to the dynamical rearrangement occurring in the hydrogen bonding (HB) network of water molecules. The results of our measurements clearly showed a characteristic "structure-breaker" effect on the tetrahedral HB arrangements induced on water molecules by increasing of both temperature and solute concentration, allowing us to also extract thermodynamic parameters. These results could be a key step for a clearer understanding of the connection between the dynamical properties of hydration water and the complexing ability of this cyclodextrin derivative.
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Affiliation(s)
- Valentina Venuti
- Dipartimento di Scienze Matematiche e Informatiche, Scienze Fisiche e Scienze della Terra, Università degli Studi di Messina , viale Ferdinando Stagno D'Alcontres 31, 98166 Messina, Italy
| | - Barbara Rossi
- Elettra - Sincrotrone Trieste , Strada Statale 14 km 163.5, Area Science Park, I-34149 Trieste, Italy.,Dipartimento di Fisica, Università degli Studi di Trento , via Sommarive 14, I-38123 Povo, Trento, Italy
| | - Vincenza Crupi
- Dipartimento di Scienze Matematiche e Informatiche, Scienze Fisiche e Scienze della Terra, Università degli Studi di Messina , viale Ferdinando Stagno D'Alcontres 31, 98166 Messina, Italy
| | - Francesco D'Amico
- Elettra - Sincrotrone Trieste , Strada Statale 14 km 163.5, Area Science Park, I-34149 Trieste, Italy
| | - Alessandro Gessini
- Elettra - Sincrotrone Trieste , Strada Statale 14 km 163.5, Area Science Park, I-34149 Trieste, Italy
| | - Domenico Majolino
- Dipartimento di Scienze Matematiche e Informatiche, Scienze Fisiche e Scienze della Terra, Università degli Studi di Messina , viale Ferdinando Stagno D'Alcontres 31, 98166 Messina, Italy
| | - Claudio Masciovecchio
- Dipartimento di Fisica, Università degli Studi di Trento , via Sommarive 14, I-38123 Povo, Trento, Italy
| | - Rosanna Stancanelli
- Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche e Ambientali, Università degli Studi di Messina , viale Ferdinando Stagno D'Alcontres 31, 98166 Messina, Italy
| | - Cinzia Anna Ventura
- Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche e Ambientali, Università degli Studi di Messina , viale Ferdinando Stagno D'Alcontres 31, 98166 Messina, Italy
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6
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Rossi B, Venuti V, Mele A, Punta C, Melone L, D'Amico F, Gessini A, Crupi V, Majolino D, Trotta F, Masciovecchio C. Vibrational signatures of the water behaviour upon confinement in nanoporous hydrogels. Phys Chem Chem Phys 2016; 18:12252-9. [DOI: 10.1039/c5cp07936e] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Vibrational spectroscopy is used to investigate how the hydrogen-bond dynamics of water is influenced by nano-confinement and hydrophobic/hydrophilic solvation effects.
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Affiliation(s)
- B. Rossi
- Elettra – Sincrotrone Trieste
- 34149 Trieste
- Italy
- Department of Physics University of Trento and INSTM Local Unit
- Trento
| | - V. Venuti
- Department of Physics and Earth Sciences
- University of Messina
- 98166 Messina
- Italy
| | - A. Mele
- Department of Chemistry
- Materials and Chemical Engineering “G. Natta”
- Politecnico di Milano and INSTM local unit
- Milano
- Italy
| | - C. Punta
- Department of Chemistry
- Materials and Chemical Engineering “G. Natta”
- Politecnico di Milano and INSTM local unit
- Milano
- Italy
| | - L. Melone
- Department of Chemistry
- Materials and Chemical Engineering “G. Natta”
- Politecnico di Milano and INSTM local unit
- Milano
- Italy
| | - F. D'Amico
- Elettra – Sincrotrone Trieste
- 34149 Trieste
- Italy
| | - A. Gessini
- Elettra – Sincrotrone Trieste
- 34149 Trieste
- Italy
| | - V. Crupi
- Department of Physics University of Trento and INSTM Local Unit
- Trento
- Italy
| | - D. Majolino
- Department of Physics University of Trento and INSTM Local Unit
- Trento
- Italy
| | - F. Trotta
- Department of Chemistry
- University of Torino
- 10125 Torino
- Italy
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7
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Max JJ, Chapados C. Determination of Spectroscopic Band Shapes by Second Derivatives, Part II: Infrared Spectra of Liquid Light and Heavy Water. APPLIED SPECTROSCOPY 2015; 69:1281-1292. [PMID: 26647051 DOI: 10.1366/14-07714] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Second derivative and band simulation techniques are used in a synergetic relationship to identify components in the infrared (IR) spectra of liquid light and heavy water. Nine Gaussian components are retrieved in massive OH and OD stretch absorption. In this context, ν1 and ν3 are the principal components along with satellites derived from harmonic and combination bands. The Raman spectrum of light water matches the IR components with intensity variations as expected.
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8
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Frances L, Grivet M, Renault JP, Groetz JE, Ducret D. Hydrogen radiolytic release from zeolite 4A/water systems under γ irradiations. Radiat Phys Chem Oxf Engl 1993 2015. [DOI: 10.1016/j.radphyschem.2015.01.008] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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9
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Rossi B, Venuti V, Mele A, Punta C, Melone L, Crupi V, Majolino D, Trotta F, D’Amico F, Gessini A, Masciovecchio C. Probing the molecular connectivity of water confined in polymer hydrogels. J Chem Phys 2015; 142:014901. [DOI: 10.1063/1.4904946] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
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10
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Venuti V, Rossi B, D'Amico F, Mele A, Castiglione F, Punta C, Melone L, Crupi V, Majolino D, Trotta F, Gessini A, Masciovecchio C. Combining Raman and infrared spectroscopy as a powerful tool for the structural elucidation of cyclodextrin-based polymeric hydrogels. Phys Chem Chem Phys 2015; 17:10274-82. [DOI: 10.1039/c5cp00607d] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
UV Raman spectroscopy and infrared spectroscopy have been efficiently implemented for the structural and dynamic elucidation of cyclodextrin-based polymeric hydrogels.
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11
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12
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Castiglione F, Crupi V, Majolino D, Mele A, Rossi B, Trotta F, Venuti V. Effect of Cross-Linking Properties on the Vibrational Dynamics of Cyclodextrins-Based Polymers: An Experimental–Numerical Study. J Phys Chem B 2012; 116:7952-8. [DOI: 10.1021/jp303006a] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Franca Castiglione
- Department
of Chemistry, Materials
and Chemical Engineering “G. Natta”, Politecnico di Milano, Via Mancinelli 7, 20131 Milano, Italy
| | - Vincenza Crupi
- Dipartimento di Fisica, Università di Messina and CNISM UdR Messina,
Viale Ferdinando Stagno D’Alcontres 31, 98166 Messina, Italy
| | - Domenico Majolino
- Dipartimento di Fisica, Università di Messina and CNISM UdR Messina,
Viale Ferdinando Stagno D’Alcontres 31, 98166 Messina, Italy
| | - Andrea Mele
- Department
of Chemistry, Materials
and Chemical Engineering “G. Natta”, Politecnico di Milano, Via Mancinelli 7, 20131 Milano, Italy
| | - Barbara Rossi
- Dipartimento di Informatica, Università di Verona, Strada le Grazie 15, 37134
Verona, Italy
- Dipartimento
di Fisica, Università di Trento,
Via Sommarive 14, 38123
Povo, Trento, Italy
| | - Francesco Trotta
- Dipartimento
di Chimica, Università di Torino, Via Pietro Giuria 7, 10125
Torino, Italy
| | - Valentina Venuti
- Dipartimento di Fisica, Università di Messina and CNISM UdR Messina,
Viale Ferdinando Stagno D’Alcontres 31, 98166 Messina, Italy
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13
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Huang XF, Hu JL, Pan LQ, Li CX, Sun G, Lu KQ, Cao ZX, Wang Q. A weakened structure-breaking effect of Na+ and Cl− on water inside partially filled mesoporous silica. Chem Phys Lett 2012. [DOI: 10.1016/j.cplett.2012.03.021] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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14
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Vibrational dynamics and hydrogen bond properties of β-CD nanosponges: an FTIR-ATR, Raman and solid-state NMR spectroscopic study. J INCL PHENOM MACRO 2012. [DOI: 10.1007/s10847-012-0106-z] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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15
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Singh LP, Cerveny S, Alegría A, Colmenero J. Dynamics of Water in Supercooled Aqueous Solutions of Poly(propylene glycol) As Studied by Broadband Dielectric Spectroscopy and Low-Temperature FTIR-ATR Spectroscopy. J Phys Chem B 2011; 115:13817-27. [DOI: 10.1021/jp2073705] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
| | - Silvina Cerveny
- Centro de Fisica de Materiales (CSIC, UPV/EHU)-Materials Physics Center, Paseo Manuel de Lardizabal 5, 20018, San Sebastián, Spain
| | - Angel Alegría
- Departamento de Física de Materiales, UPV/EHU, Facultad de Química, 20018, San Sebastián, Spain
- Donostia International Physics Center, San Sebastián, Spain
| | - Juan Colmenero
- Centro de Fisica de Materiales (CSIC, UPV/EHU)-Materials Physics Center, Paseo Manuel de Lardizabal 5, 20018, San Sebastián, Spain
- Departamento de Física de Materiales, UPV/EHU, Facultad de Química, 20018, San Sebastián, Spain
- Donostia International Physics Center, San Sebastián, Spain
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16
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Varela-Gandía FJ, Berenguer-Murcia Á, Lozano-Castelló D, Cazorla-Amorós D. Zeolite A/carbon membranes for H2 purification from a simulated gas reformer mixture. J Memb Sci 2011. [DOI: 10.1016/j.memsci.2011.05.026] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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17
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Crupi V, Majolino D, Venuti V, Guella G, Mancini I, Rossi B, Verrocchio P, Viliani G, Stancanelli R. Temperature effect on the vibrational dynamics of cyclodextrin inclusion complexes: investigation by FTIR-ATR spectroscopy and numerical simulation. J Phys Chem A 2010; 114:6811-7. [PMID: 20524676 DOI: 10.1021/jp101888g] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The vibrational dynamics of solid inclusion complexes of the nonsteroidal anti-inflammatory drug Ibuprofen (IBP) with beta-cyclodextrin (beta-CD) and methyl-beta-cyclodextrin (Me-beta-CD) has been investigated by using attenuated total reflection-Fourier transform infrared FTIR-ATR spectroscopy, in order to monitor the changes induced, as a consequence of complexation, on the vibrational spectrum of IBP, in the wavenumber range 600-4000 cm(-1). Quantum chemical calculations were performed on monomeric and dimeric structures of IBP, derived from symmetric hydrogen bonding of the two carboxylic groups, in order to unambiguously assign some characteristic IR bands in the IBP spectrum. The evolution in temperature from 250 to 340 K of the C horizontal lineO stretching vibration, described by a best-fit procedure, allowed us to extract the thermodynamic parameter DeltaH associated to the binding of IBP with betaCDs in the solid phase. By comparing these results, Me-beta-CD has been shown to be the most effective carrier for IBP.
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Affiliation(s)
- Vincenza Crupi
- Dipartimento di Fisica, Università degli Studi di Messina, CNISM, UdR Messina, C. da Papardo, S. ta Sperone 31, P.O. Box 55, 98166 S. Agata, Messina, Italy
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18
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Cannavà C, Crupi V, Ficarra P, Guardo M, Majolino D, Mazzaglia A, Stancanelli R, Venuti V. Physico-chemical characterization of an amphiphilic cyclodextrin/genistein complex. J Pharm Biomed Anal 2009; 51:1064-8. [PMID: 20036091 DOI: 10.1016/j.jpba.2009.11.025] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2009] [Revised: 11/24/2009] [Accepted: 11/24/2009] [Indexed: 10/20/2022]
Abstract
Specific recognition of cell-targeting systems as host-carriers modified with receptor targeting groups, is a major ambition in the application of supramolecular science to medicine and life science. Genistein (Gen), an isoflavone belonging to the class of phytoestrogens, is of great interest because it has been considered as potential remedy for many kinds of disease. In this work, genistein in aqueous medium and in the presence of an host nanocarrier as amphiphilic cyclodextrin (CyD) modified in the upper rim with oligoethylene hydroxyl groups [(2-oligo(ethyleneoxide)-6-hexylthio)-beta-CyD, SC6OH] at 1:1 molar ratio, has been firstly investigated by UV-vis measurements coupled with circular dichroism data, in order to characterize the drug/macrocycle binding affinity through the formation of the complex. Furthermore, FTIR-ATR technique has been used to detect the complex formation in solid phase and to characterize the functional groups responsible of the solid Gen/SC6OH complex stability. The infrared absorbance spectra of the complex, collected in a wide range of wavenumber and around the physiological temperature, have been analysed and compared with the spectra of the pure compounds and their physical mixture. By monitoring the most significant changes in the shape and position of the absorbance bands of the Gen functional groups, we showed that the formation and/or modification of polar bonds play the main role in the interaction of the drug with the amphiphilic CyD. From the results, Gen is shown to be entangled in SC6OH nanoaggregates, establishing hydrogen bonding with the hydrophilic PEG chains.
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Affiliation(s)
- C Cannavà
- Dipartimento Farmaco-Chimico, Università di Messina, Viale Annunziata, 98168 Messina, Italy
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19
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Pagnotta SE, Cerveny S, Alegría A, Colmenero J. Dielectric relaxations in ribose and deoxyribose supercooled water solutions. J Chem Phys 2009; 131:085102. [DOI: 10.1063/1.3202215] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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20
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Okada T, Harada M, Ohki T. Hydration of ions in confined spaces and ion recognition selectivity. ANAL SCI 2009; 25:167-75. [PMID: 19212049 DOI: 10.2116/analsci.25.167] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The hydration of ions in confined spaces, such as the interior of ion-exchange resins, micelles, and surface monolayers, is discussed on the basis of results obtained with X-ray absorption fine structure studies, electrophoresis, and ion-transfer voltammetry. The general trends are that anions are partly dehydrated therein, whereas cations are likely to keep their first hydration shells. For bromide ions, the hydration numbers under various circumstances have been determined. The extents of dehydration depend not only on the structure of the cationic sites electrostatically attracting bromide ions but also on whether the cationic sites are exposed to a solution or are effectively shielded from it. These findings will be useful for designing the systems for ionic recognition and separation.
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Affiliation(s)
- Tetsuo Okada
- Department of Chemistry, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan.
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21
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Stancanelli R, Crupi V, De Luca L, Ficarra P, Ficarra R, Gitto R, Guardo M, Iraci N, Majolino D, Tommasini S, Venuti V. Improvement of water solubility of non-competitive AMPA receptor antagonists by complexation with beta-cyclodextrin. Bioorg Med Chem 2008; 16:8706-12. [PMID: 18762428 DOI: 10.1016/j.bmc.2008.07.085] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2008] [Revised: 07/21/2008] [Accepted: 07/29/2008] [Indexed: 01/23/2023]
Abstract
The (R,S)-2-acetyl-1-(4'-chlorophenyl)-6,7-dimethoxy-1,2,3,4-tetrahydroisoquinoline ((R,S)-1) was previously identified as a potent non-competitive AMPA receptor antagonist able to prevent epileptic seizures and reduce AMPA-induced current in electrophysiological experiments. Through the enantiomeric resolution of racemate by chiral HPLC we already demonstrated that the (R)-1 enantiomer was the eutomer. Considering the poor water solubility, these compounds have been complexed with beta-cyclodextrin (beta-CyD). The effect of beta-cyclodextrin on the spectral features of molecules was quantitatively investigated, in fully aqueous medium by phase-solubility study and the obtained diagrams suggested that it forms complexes with a molar ratio 1:1. The binding constant (K((R)-1)=15889M(-1), K((R,S)(-1))=1079 M(-1)) and the complexation efficiency (CE) were calculated. Then the solid complexes in 1:1 molar ratio were prepared by the co-precipitation method and the FTIR-ATR measurements were carried out in order to confirm the host-guest interactions that drive the complexation process, by monitoring the significant differences of the spectra of the complexes with respect to those of the corresponding physical mixtures in the same molar ratio. The experimental data have been compared with molecular modelling studies and we confirmed our hypothesis.
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Affiliation(s)
- Rosanna Stancanelli
- Dipartimento Farmaco-Chimico, Università di Messina, Viale Annunziata, 98168 Messina, Italy.
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22
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Demontis P, Gulín-González J, Jobic H, Masia M, Sale R, Suffritti GB. Dynamical properties of confined water nanoclusters: Simulation study of hydrated zeolite NaA: structural and vibrational properties. ACS NANO 2008; 2:1603-1614. [PMID: 19206362 DOI: 10.1021/nn800303r] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Water nanoclusters confined to zeolitic cavities have been extensively investigated by various experimental techniques. We report a series of molecular dynamics simulations at different temperatures and for water nanoclusters of different sizes in order to attempt an atomistic interpretation of the properties of these systems. The cavities of zeolite NaA are spherical in shape and about 1 nm in diameter and can host nanoclusters of water containing nearly up to 24 water molecules. A modified interaction potential, yielding a better reproduction of experimental hydration energy and water diffusivity across a number of different zeolites, is proposed. Molecular dynamics simulations reproduce the known experimental structural features obtained by X-ray diffraction. Variations of simulated vibrational IR and IINS spectra with temperature and size of nanoclusters are in good agreement with experiment. The simulated water nanoclusters in zeolite NaA are found to be too small to crystallize and, at low temperature, behave as amorphous ice, in agreement with recent experimental results for similar water nanoclusters in reverse micelles.
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23
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Stancanelli R, Ficarra R, Cannavà C, Guardo M, Calabrò M, Ficarra P, Ottanà R, Maccari R, Crupi V, Majolino D, Venuti V. UV–vis and FTIR-ATR characterization of 9-fluorenon-2-carboxyester/(2-hydroxypropyl)-β-cyclodextrin inclusion complex. J Pharm Biomed Anal 2008; 47:704-9. [DOI: 10.1016/j.jpba.2008.02.018] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2007] [Revised: 02/18/2008] [Accepted: 02/19/2008] [Indexed: 10/22/2022]
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24
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Harada M, Okada T. Hydration of counterions in cation exchange resins studied by X-ray absorption fine structure. Chem Commun (Camb) 2008:5182-4. [PMID: 18956062 DOI: 10.1039/b810997d] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Makoto Harada
- Department of Chemistry, Tokyo Institute of Technology, Meguro-ku, Tokyo, 152-8551, Japan
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25
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Crupi V, Ficarra R, Guardo M, Majolino D, Stancanelli R, Venuti V. UV–vis and FTIR–ATR spectroscopic techniques to study the inclusion complexes of genistein with β-cyclodextrins. J Pharm Biomed Anal 2007; 44:110-7. [PMID: 17379467 DOI: 10.1016/j.jpba.2007.01.054] [Citation(s) in RCA: 87] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2006] [Revised: 01/29/2007] [Accepted: 01/31/2007] [Indexed: 10/23/2022]
Abstract
The effect of beta-cyclodextrin (beta-CyD), (2-hydroxypropyl)-beta-cyclodextrin (HP-beta-CyD) and methyl-beta-cyclodextrin (Me-beta-CyD) complexation on the UV absorption of genistein (Gen) was studied in pure water. A phase solubility study was performed, according to the method reported by Higuchi and Connors, to evaluate the changes of isoflavone in the complexation state and the obtained diagrams suggested that it forms complexes with a stoichiometry of 1:1. Then, the solid complexes of genistein with these macrocycles in 1:1 molar ratio were prepared by the co-precipitation method and characterized by FTIR absorption spectroscopy in ATR geometry. The host-guest interactions have been evidenced by monitoring, in the FTIR-ATR spectra, the changes in some guest molecule bands relative to those observed in the spectra of the 1:1 physical mixtures and complexes. In particular, for the high-frequency O-H stretching band, a quantitative vibrational assignment of the observed sub-bands has been made. From the results, the inclusion phenomena have been discussed.
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Affiliation(s)
- V Crupi
- Dipartimento di Fisica, Facoltà di Scienze MM.FF.NN., Università di Messina, C.da Papardo, S.ta Sperone 31, P.O. Box 55, 98166 S. Agata, Messina, Italy
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Ohki T, Harada M, Okada T. Solvation of Ions in Hydrophilic Layer of Polyoxyethylated Nonionic Micelle. Cooperative Approach by Electrophoresis and Ion-Transfer Voltammetry. J Phys Chem B 2006; 110:15486-92. [PMID: 16884271 DOI: 10.1021/jp062493l] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Electrophoretic measurements of micellar mobility have revealed that polyoxyethylated nonionic surfactant micelles have negative zeta potential in various electrolytes, indicating that the partition of anions into the micelle dominates the entire electrolyte partition and the induced surface potential of the micelle. Although an excess of a negative charge is thus revealed in the micelle, it is uncertain whether anions are preferably solvated in the micelles or cations are expelled from the micelles. To determine the solvation energies of single ions in the hydrophilic layer of the micelle, we have performed ion transfer voltammetric measurements at microinterfaces between nitrobenzene and aqueous tetraethyleneglycol solution, which acts as a model for the palisade layer of the micelles. The cooperative utilization of these different methods has allowed us to determine the Gibbs free energy of transfer of a single ion without an extrathermodynamic assumption. On the basis of the resulting values, the partition of ions and the zeta potential induced by the imbalance of anionic and cationic partition have been quantitatively explained.
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Affiliation(s)
- Takumi Ohki
- Department of Chemistry, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8551, Japan
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Corsaro C, Crupi V, Majolino D, Parker SF, Venuti V, Wanderlingh U. Inelastic Neutron Scattering Study of Water in Hydrated LTA-Type Zeolites. J Phys Chem A 2005; 110:1190-5. [PMID: 16420024 DOI: 10.1021/jp054253w] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The vibrational dynamics of water molecules encapsulated in synthetic Na-A and Mg-exchanged A zeolites were studied versus temperature by inelastic neutron scattering (INS) measurements (30-1200 cm(-1)) as a function of the induced ion-exchange percentage by using the indirect geometry tof spectrometer TOSCA at the ISIS pulse neutron facility (RAL, UK). The experimental INS spectra were compared with those of ice Ih to characterize the structural changes induced by confinement on the H2O hydrogen-bonded network. We observed, after increasing the Mg2+ content, a tendency of water molecules to restore the bulklike arrangements together with more hindered dynamics. These results are confirmed by the analysis of the evaluated one-phonon amplitude-weighted proton vibrational density of states aimed, in particular, to follow the evolution of the water molecules librational mode region.
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Affiliation(s)
- Carmelo Corsaro
- Dipartimento di Fisica, Università di Messina, C.da Papardo, S.ta Sperone 31, P.O. BOX 55, 98166 Messina, Italy
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Corsaro C, Crupi V, Longo F, Majolino D, Venuti V, Wanderlingh U. Elastic neutron scattering study of water dynamics in ion-exchanged type-A zeolites. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2005; 72:061504. [PMID: 16485952 DOI: 10.1103/physreve.72.061504] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2005] [Revised: 10/10/2005] [Indexed: 05/06/2023]
Abstract
With the aim to investigate, by means of elastic neutron scattering, the effects produced by the cation substitution on the dynamics of water in zeolites, we measured, using a neutron backscattering spectrometer, the temperature dependence of mean-square atomic displacements [u2] derived from window integrated quasielastic spectra of fully and partially hydrated Na-A and Mg50-A zeolites. The results, collected in the 20-273 K temperature range, reveal that, at low temperature, the [u2] shows a harmonic trend independent of hydration and cation substitution, and, at higher temperatures, the onset of a non-Gaussian dynamics of the elastic intensity. This latter takes place at T approximately 200 K and approximately 150 K for fully and partially hydrated samples, respectively. This behavior has been interpreted in terms of reorientational jumps of H atoms described by two-site processes within an asymmetric double-minimum potential. In spite of its simplicity, the model seems to reproduce the rearrangement of the hydrogen bond network of zeolitic water. The fit results indicate a reduced proton mobility by diminishing the water content and by the induced Na+-->Mg2+ ion exchange, in agreement with previous incoherent quasielastic neutron scattering results at higher temperatures.
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Affiliation(s)
- C Corsaro
- Physics Department, Messina University, c.da Papardo, S.ta Sperone 31, P.O. Box 55, 98166 S. Agata, Messina, Italy
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