scholarly journals Screening Metal–Organic Frameworks for Separation of Binary Solvent Mixtures by Compact NMR Relaxometry

Molecules ◽  
2021 ◽  
Vol 26 (12) ◽  
pp. 3481
Author(s):  
Marc Wagemann ◽  
Natalia Radzik ◽  
Artur Krzyżak ◽  
Alina Adams
Keyword(s):  
Separation Efficiency ◽  
Metal Organic Frameworks ◽  
Solvent Mixture ◽  
Proton Nuclear Magnetic Resonance ◽  
Binary Solvent ◽  
Solvent Mixtures ◽  
Separation And Purification ◽  
Nmr Relaxometry ◽  
Metal Organic ◽  
Static Conditions

Metal–organic frameworks (MOFs) have great potential as an efficient alternative to current separation and purification procedures of a large variety of solvent mixtures—a critical process in many applications. Due to the huge number of existing MOFs, it is of key importance to identify high-throughput analytical tools, which can be used for their screening and performance ranking. In this context, the present work introduces a simple, fast, and inexpensive approach by compact low-field proton nuclear magnetic resonance (NMR) relaxometry to investigate the efficiency of MOF materials for the separation of a binary solvent mixture. The mass proportions of two solvents within a particular solvent mixture can be quantified before and after separation with the help of a priori established correlation curves relating the effective transverse relaxation times T2eff and the mass proportions of the two solvents. The new method is applied to test the separation efficiency of powdered UiO-66(Zr) for various solvent mixtures, including linear and cyclic alkanes and benzene derivate, under static conditions at room temperature. Its reliability is demonstrated by comparison with results from 1H liquid-state NMR spectroscopy.

Decorated traditional cellulose with nanoscale chiral metal-organic frameworks for enhanced enantioselective capture

2021 ◽  
Author(s):  
Yun Guo ◽  
Ling Zhang ◽  
Kexuan Wang ◽  
Ajuan Yu ◽  
Shusheng Zhang ◽  
...  
Keyword(s):  
Chiral Separation ◽  
Separation Efficiency ◽  
Copper Ions ◽  
Metal Organic Frameworks ◽  
Controlled Synthesis ◽  
Metal Organic ◽  
Efficiency Test

Herein, a rapid approach toward the size/morphology-controlled synthesis of [Cu(L-mal)(bipy)·2H2O] (CuLBH) was developed by adjusting the concentration of 2-methylimidazole (2-MI) and copper ions. The chiral separation efficiency test indicated that...

Immobilization of Oxygen Atoms in the Pores of Microporous Metal–Organic Frameworks for C2H2 Separation and Purification

2020 ◽  
Vol 3 (3) ◽  
pp. 2911-2919 ◽  
Author(s):  
Tingting Xu ◽  
Zhenzhen Jiang ◽  
Puxu Liu ◽  
Haonan Chen ◽  
Xiaosi Lan ◽  
...  
Keyword(s):  
Metal Organic Frameworks ◽  
Separation And Purification ◽  
Metal Organic ◽  
Oxygen Atoms

Exploration of porous metal–organic frameworks for gas separation and purification

2019 ◽  
Vol 378 ◽  
pp. 87-103 ◽  
Author(s):  
Rui-Biao Lin ◽  
Shengchang Xiang ◽  
Huabin Xing ◽  
Wei Zhou ◽  
Banglin Chen
Keyword(s):  
Gas Separation ◽  
Metal Organic Frameworks ◽  
Porous Metal ◽  
Separation And Purification ◽  
Metal Organic

scholarly journals Fast real-time monitoring of entacapone crystallization and characterization of polymorphs via Raman spectroscopy, statistics and SWAXS

2014 ◽  
Vol 64 (1) ◽  
pp. 1-13 ◽  
Author(s):  
Tomislav Jednačak ◽  
Aden Hodzic ◽  
Otto Scheibelhofer ◽  
Marijan Marijan ◽  
Johannes G. Khinast ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Optical Probe ◽  
Solvent Mixture ◽  
Binary Solvent ◽  
Solvent Mixtures ◽  
Starting Point ◽  
Principal Components Method ◽  
Components Method

Abstract Crystallization of the drug entacapone from binary solvent mixtures was monitored in situ using a Raman optical probe. The recorded Raman spectra and statistical analysis, which included the principal components method and indirect hard modeling made it possible to estimate the starting point of crystallization, to assess crystallization temperatures and to provide information on the polymorphic content of the mixture. It was established that crystallization temperatures were proportional to the volume content of the solvent in mixtures. The samples were also evaluated off-line via Raman spectroscopy and SWAXS. The collected data showed the presence of forms b and g in all solvent mixtures. In a toluene/methanol 30:70 mixture, in addition to forms b and g, at least one of the forms A, D or a was also indicated by SWAXS. The results have shown that the presence of a particular polymorph is strongly dependent on the nature and portion of the solvent in the binary solvent mixture.

scholarly journals Ex Situ NMR Relaxometry of Metal-Organic Frameworks for Rapid Surface-Area Screening

2013 ◽  
Vol 52 (46) ◽  
pp. 12043-12046 ◽  
Author(s):  
Joseph J. Chen ◽  
Xueqian Kong ◽  
Kenji Sumida ◽  
Mary Anne Manumpil ◽  
Jeffrey R. Long ◽  
...  
Keyword(s):  
Surface Area ◽  
Metal Organic Frameworks ◽  
Ex Situ ◽  
Nmr Relaxometry ◽  
Metal Organic

Swelling of Vulcanized Rubbers in Binary Solvent Mixtures

1965 ◽  
Vol 38 (4) ◽  
pp. 940-942
Author(s):  
J. Scanlan
Keyword(s):  
Ternary Systems ◽  
Interaction Constant ◽  
Solvent Mixture ◽  
Binary Solvent ◽  
Solvent Mixtures ◽  
Binary Solvent Mixtures ◽  
Binary Solvent Mixture

Abstract The single-liquid approximation has been applied to the data of Bristow on ternary systems containing benzene and cyclohexane with one of the rubbers, natural, SBR, or butyl. Satisfactory fits are obtained with a constant value of the interaction constant between the two solvents χ12 which differs markedly, however, from the value obtained by measurements on the binary solvent mixture.

scholarly journals Ex Situ NMR Relaxometry of Metal-Organic Frameworks for Rapid Surface-Area Screening

2013 ◽  
Vol 125 (46) ◽  
pp. 12265-12268 ◽  
Author(s):  
Joseph J. Chen ◽  
Xueqian Kong ◽  
Kenji Sumida ◽  
Mary Anne Manumpil ◽  
Jeffrey R. Long ◽  
...  
Keyword(s):  
Surface Area ◽  
Metal Organic Frameworks ◽  
Ex Situ ◽  
Nmr Relaxometry ◽  
Metal Organic

scholarly journals Solvatochromic Study of Two Carbanion Monosubstituted 4-Tolyl-1,2,4-triazol-1-ium Phenacylids in Binary Hydroxyl Solvent Mixtures

Molecules ◽  
2021 ◽  
Vol 26 (13) ◽  
pp. 3910
Author(s):  
Dana Ortansa Dorohoi ◽  
Dan-Gheorghe Dimitriu ◽  
Mihaela Maria Dulcescu-Oprea ◽  
Ana Cezarina Morosanu ◽  
Nicoleta Puica-Melniciuc ◽  
...  
Keyword(s):  
Cell Model ◽  
Solvation Shell ◽  
Solvent Mixture ◽  
Point Of View ◽  
Visible Range ◽  
Binary Solvent ◽  
Solvent Mixtures ◽  
Binary Solvent Mixture ◽  
Spectral Shifts ◽  
The Difference

Two 4-tolyl-1,2,4-triazol-1-ium methylids, namely 4-tolyl-1,2,4-triazol-1-ium-phenacylid and 4-tolyl-1,2,4-triazol-1-ium-4′-nitro-phenacylid, are studied from solvatochromic point of view in binary solvent mixtures of water with ethanol and water with methanol. The contributions (expressed in percent) of the universal and specific interactions are separated from the spectral shifts recorded in the visible range for each composition of the binary solvent mixture. The essential role of the orientation and induction interactions in the studied solutions was demonstrated. Based on the statistic cell model of the binary solvent mixture solutions, the difference between the formation energies of ylid-water and ylid-alcohol complexes is estimated. The composition of the ylid’s first solvation shell was also established using the model of the binary solvent mixture solutions. The results obtained from the statistical cell model were compared with those obtained by using the Suppan’s model, resulting a good agreement.

Application of mixed solvents for elution of organophosphate pesticides extracted from raw propolis by matrix solid-phase dispersion and analysis by GC-MS

2014 ◽  
Vol 68 (11) ◽  
Author(s):  
Kati Medina-Dzul ◽  
David Muñoz-Rodríguez ◽  
Yolanda Moguel-Ordoñez ◽  
Cristian Carrera-Figueiras
Keyword(s):  
Solid Phase ◽  
Mixed Solvents ◽  
Solvent Mixture ◽  
Binary Solvent ◽  
Solvent Mixtures ◽  
Organophosphate Pesticides ◽  
Experimental Conditions ◽  
Matrix Solid Phase Dispersion ◽  
Phase Dispersion ◽  
Relative Standard

AbstractThe excessive application of organophosphate pesticides (OPPs) in crop fields close to hives and its application in beekeeping practices are potential sources of contamination of propolis. Pesticides were extracted from raw propolis by matrix solid-phase dispersion. Because of the complex chemical composition of propolis, binary solvent mixtures based on acetonitrile and a relatively non-polar solvent in different proportions were tested for the selective elution of OPPs. The effect of mixed solvents on clean-up was evaluated by GC-MS and the main interfering compounds co-eluted with pesticides were identified. In addition, three volumes of the solvent mixture and the volume of the sample were evaluated in an experimental factorial design. The final experimental conditions were 1 mL of dissolved propolis and 8 mL of acetonitrile/dichloromethane (g4 r = 25: 75). Mean recoveries ranged from 55 % to 96 % (relative standard deviation < 8 %) with an inter-day precision lower than 24 %. The proposed method was applied to the analysis of real samples obtained from local beekeepers.

Dielectric enrichment in binary solvent mixtures. The intramolecular hydrogen bond in N-alkyl-substituted o-nitroanilines. Substituent effects

1992 ◽  
Vol 70 (10) ◽  
pp. 2677-2682 ◽  
Author(s):  
Rosa Cattana ◽  
Juana J. Silber ◽  
Jorge Anunziata
Keyword(s):  
Hydrogen Bond ◽  
Intramolecular Hydrogen Bond ◽  
Preferential Solvation ◽  
Substituent Effects ◽  
Solvent Mixture ◽  
Binary Solvent ◽  
Solvent Mixtures ◽  
Hydrogen Bond Acceptor ◽  
Intramolecular Hydrogen ◽  
Strong Intramolecular Hydrogen Bond

In this work we report solvatochromism studies on o-nitroaniline and several N-alkyl-o-nitroaniline derivatives used as solutes in solvent mixtures of an "inert" nonpolar cosolvent, cyclohexane, and THF as a solvent with hydrogen bond acceptor ability. These studies allowed us to establish the competition between inter- and intramolecular hydrogen bond in solutes. This was done by comparing the magnitude of the local inhomogeneity induced by the solute-in-solvent mixture, that is, "preferential solvation," using Suppan's dielectric enrichment model as modified by us to be applied to electronic transitions. Since preferential solvation accounts for dielectric as well as specific interactions while dielectric enrichment only for the former, it was shown by comparison that it is possible to separate both effects and even quantify them. It was deduced that N-alkyl-o-nitroanilines form a strong intramolecular hydrogen bond, which remains unbroken even in polar solvents and hydrogen bond acceptors such as dimethyl sulfoxide. This was also confirmed by solvatochromic studies in pure solvents. On the other hand, a symmetrical dependence of the effects of alkyl substituents and solvents on the shifts of the absorption spectra was observed.

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