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Items from 1 to 20 out of 7,303 results

article

Low-melting cationic 3d-transition metal complexes of azole-based ligands

Timo Huxel, Michael Skaisgirski, Julia Klingele, T. Huxel, more

Polyhedron > 2015 > 93 > Complete > 28-36

Ligands N-methylimidazole (MIm) and N-ethylimidazole (EIm) were used for the preparation of [Fe ^II (L) ₆ ](NTf ₂ ) ₂ ·0.5EtOH·0.5H ₂ O. With T _fus =83°C, the EIm complex was characterised as paramagnetic MeIL. Using bidentate imidazole ligands 2-(2-pyridyl)-1-ethylimidazole (L ¹ ) and 2-(2-pyridyl)-1-(2-methoxyethyl)imidazole (L ² ) 3:1...

article

Effect of ionic liquids in unimolecular solvolysis reactions involving carbocationic intermediates

Elizabeth D. Kochly, Susan Citrak, Nelius Gathondu, Gabriella Amberchan, more

Tetrahedron Letters > 2014 > 55 > 52 > 7181-7185

Solvolysis studies of pivaloyl triflate were performed using ionic liquid/methanol solvent mixtures. The rearranged carbocation intermediate reacts with methanol via nucleophilic attack or elimination of a proton. Relative amounts of products were determined through ¹ H NMR analysis. For most ionic liquids, increasing the ionic liquid:methanol ratio leads to increased yields of elimination...

article

Spectroscopic investigations of Eu3+-complexes with ligands containing multiple diglycolamide pendant arms in a room temperature ionic liquid

Arijit Sengupta, Prasanta K. Mohapatra, Mudassir Iqbal, Jurriaan Huskens, more

Journal of Luminescence > 2014 > 154 > Complete > 392-401

Fluorescence spectroscopy was used to study the complexation of different ligands containing multiple diglycolamide (DGA) pendent arms such as T-DGA (tripodal diglycolamide), C4DGA (upper rim functionalized calix [4] arene with four DGA moieties), and C8DGA (both side functionalized calix [4] arene with eight DGA moieties) with Eu ³ ⁺ in ionic liquids such as C ₄ mimNTf ₂ ...

article

An efficient regioselective reaction of indole with 2H-chromenes for the synthesis of new 4H-chromenes in environmentally benign media

L. Chandrasekhara Rao, N. Satish Kumar, N. Jagadeesh babu, H.M. Meshram, more

Tetrahedron Letters > 2014 > 55 > 38 > 5342-5346

An efficient regioselective, catalyst free, and green protocol has been developed for the synthesis of a novel class of 4H-chromene scaffolds at room temperature in ionic liquid. The method is general and applicable for a series of 2H-chromenes as well as indole derivatives.

article

Kinetics of ionic liquid-heteropolyanion salts catalyzed transesterification of oleic acid methyl ester: A study by sequential method

Kaixin Li, Linlu Bai, Yanhui Yang, Xinli Jia, more

Catalysis Today > 2014 > 233 > Complete > 155-161

The kinetics of ionic liquid-heteropolyanion (IL-HPA) salts catalyzed transesterification of oleic acid methyl ester (OAME) was studied via a sequential method. The method can be separated into two parts. The first part was to analyze the kinetics of transesterification of OAME catalyzed by a novel catalyst and to provide a way to simulate the reaction rate profile. The second part was to verify the...

article

In situ STM studies of Bi(111)|1-ethyl-3-methylimidazolium tetrafluoroborate+1-ethyl-3-methylimidazolium iodide interface

E. Anderson, V. Grozovski, L. Siinor, C. Siimenson, more

Electrochemistry Communications > 2014 > 46 > Complete > 18-21

Formation of an interfacial structure at an electrochemically polished Bi(111) surface in 1wt.% 1-ethyl-3-methylimidazolium iodide+1-ethyl-3-methylimidazolium tetrafluoroborate ionic liquid mixture has been analysed using the high-resolution in situ electrochemical scanning tunneling microscopy, cyclic voltammetry and electrochemical impedance methods. At 22+/-1 ^o C, a well-defined 2-dimensional...

article

Voltammetric study and electrodeposition of tellurium, lead, and lead telluride in room-temperature ionic liquid 1-ethyl-3-methylimidazolium tetrafluoroborate

Ren-Wei Tsai, Yi-Ting Hsieh, Po-Yu Chen, I-Wen Sun, more

Electrochimica Acta > 2014 > 137 > Complete > 49-56

Room-temperature ionic liquid 1-ethyl-3-methylimidazolium tetrafluoroborate (RTIL EMI-BF ₄ ) was used as the electrolyte to study the voltammetric behavior of Te(IV), Pb(II), and their mixtures. Te(IV) and Pb(II) were introduced into the IL by the addition of TeCl ₄ and PbCl ₂ , respectively, with sufficient 1-ethyl-3-methylimidazolium chloride (EMIC). The electrodeposition...

article

(Liquid+liquid) equilibrium at T=298.15K for ternary mixtures of alkane+aromatic compounds+imidazolium-based ionic liquids

Irene Domínguez, Patricia F. Requejo, José Canosa, Ángeles Domínguez, more

The Journal of Chemical Thermodynamics > 2014 > 74 > Complete > 138-143

Ionic liquids, with their unique and tunable properties, can be an advantageous alternative as extractive solvents in separation processes involving systems containing aliphatic and aromatic hydrocarbons. In this work, (liquid+liquid) equilibrium (LLE) data for the ternary systems {nonane (1)+benzene (2)+1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, [BMim][NTf ₂ ] (3)}, {octane...

article

Spectroscopic and docking studies on the interaction between pyrrolidinium based ionic liquid and bovine serum albumin

Meena Kumari, Jitendra Kumar Maurya, Upendra Kumar Singh, Abbul Bashar Khan, more

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy > 2014 > 124 > Complete > 349-356

The interaction of synthesized ionic liquid, 1-butyl-1-methyl-2-oxopyrrolidinium bromide (BMOP) and bovine serum albumin (BSA) was investigated using UV–Vis, FT-IR, steady state and time resolved fluorescence measurements and docking studies. Steady state spectra revealed that BMOP strongly quenched the intrinsic fluorescence of BSA through dynamic quenching mechanism. The corresponding thermodynamic...

article

Catalytic application of task specific ionic liquid on the synthesis of benzoquinazolinone derivatives by a multicomponent reaction

Matiur Rahman, Anirban Sarkar, Monoranjan Ghosh, Adinath Majee, more

Tetrahedron Letters > 2014 > 55 > 1 > 235-239

Benzoquinazolin-2-one derivatives were synthesized by using a catalytic amount of task specific ionic liquid, [1-methyl-3-(4-sulfobutyl)imidazolium-4-methylbenzenesulfonate] through a one-pot multicomponent Biginelli reaction of α-tetralone, aldehyde, and urea/thiourea in excellent yields within a short reaction time. Mechanism studies suggest that the reaction proceeds through iminium intermediate...

article

Study of intercalation compounds using ionic liquids into montmorillonite and their thermal stability

Chisato Takahashi, Takashi Shirai, Yasuhiko Hayashi, Masayoshi Fuji, more

Solid State Ionics > 2013 > 241 > Complete > 53-61

In the present study, we investigated the direct intercalation of three kinds of ionic liquids (ILs) of different salts (imidazolium and ammonium) and cation sizes into montmorillonite (M) clay, and successfully fabricated the IL intercalated montmorillonite (M _IL ) compounds. The peak shifts of the M _IL intercalated compounds in comparison with dried montmorillonite powder as observed...

article

Palladium Enhanced Iron Active Site – An Efficient Dual‐Atom Catalyst for Oxygen Electroreduction

Qi Li, Liangmei Luo, Chenqi Xu, Shizhu Song, more

Small > 19 > 38 > n/a - n/a

Metal–nitrogen–carbon (M–C/N) electrocatalysts have been shown to have satisfactory catalytic activity and long‐term durability for the oxygen reduction reaction (ORR). Here, a strategy to prepare a new electrocatalyst (Fe&Pd–C/N) using a unique metal‐containing ionic liquid (IL) is exploited, in which Fe & Pd ions are positively charged species atomically dispersed by coordination to the...

article

Bioderived Ionic Liquids with Alkaline Metal Ions for Transient Ionics (Small 36/2023)

Shunsuke Yamada

Small > 19 > 36 > n/a - n/a

Bioderived Ionic Liquids In article 2302385, Shunsuke Yamada develops bioderived ionic liquids with alkaline metal ions with Li, Na and Ca ions for transient ionic devices. The ionic liquids involve ready biodegradability, and its gel with the Li ions yields an electrochromic device with WO₃. This study offers an opportunity to develop electrochemical devices that are bio/eco‐resorbable after use...

article

Bioderived Ionic Liquids with Alkaline Metal Ions for Transient Ionics

Shunsuke Yamada

Small > 19 > 36 > n/a - n/a

Choline lactate, an ionic liquid composed of bioderived materials, offers an opportunity to develop biodegradable electrochemical devices. Although ionic liquids possess large potential windows, high conductivity, and are nonvolatile, they do not exhibit electrochemical characteristics such as intercalation pseudocapacitance, redox pseudocapacitance, and electrochromism. Herein, bioderived ionic liquids...

article

Numerical modeling of novel cage‐like cross‐linked membranes for enhanced proton conductivity in a high temperature‐polymer electrolyte membrane fuel cell

Venkatesh Babu Kashi Prahlad, Geethu Varghese, Thadathil Varghese Joseph, Purushothama Chippar

Journal of Applied Polymer Science > 140 > 38 > n/a - n/a

Phosphoric acid (PA)‐doped polybenzimidazole (PBI) membranes have encountered several problems associated with high cost, chemical instability, poor solubility in organic solvents, and higher doping level which results in poor mechanical properties and faster degradation of the membrane. Alternative membranes with high proton conductivity and mechanical strength for high‐temperature applications are...

article

Monitoring of Emulsion Polymerization in the Presence of Ionic Liquids Using NIR Spectroscopy

Leila Medeiros Santos, Claudio Dariva, Caroline Martins Masso, Montserrat Fortuny, more

Macromolecular Reaction Engineering > 17 > 4 > n/a - n/a

Much effort has been done toward the development of new emulsifiers able to improve the latex stability. In this sense, ionic liquids based on imidazolium constitute a new category of stabilizer in study. Moreover, the near infrared (NIR) spectroscopy has been extensively investigated as a tool to follow the properties of polymerization reactions. In this study different ionic liquids are investigated...

article

Confining organic cations in metal organic framework allows molecular level regulation of CO₂ capture

TingTing Wang, Biao Meng, Yang Zhou, Yuan Wang, more

AIChE Journal > 69 > 9 > n/a - n/a

High tunability of both ionic liquids (ILs) and metal organic frameworks (MOFs) enables great opportunity in the rational designation of IL/MOF composites for physical adsorption and separation. Traditionally, cations and anions of ILs as an entirety are combined with MOFs either inside or outside the microchannels. Herein, organic cations of ILs were confined into Cu‐BTC and the champion adsorbent...

article

Catalytic Cracking of Polylactic Acid to Acrylic Acid

Yuchen Jiao, Meng Wang, Ding Ma

Chinese Journal of Chemistry > 41 > 17 > 2071 - 2076

As a typical type of sustainable plastic, polyesters can be recycled or upcycled into value‐added chemicals in a variety of methods. However, excess reagents are required for most of the depolymerization and upcycling processes, causing the emission of environmental pollutants and the waste of chemical resources. Here we demonstrate a one‐pot catalytic process to directly crack polylactic acid into...

article

Transformation of Type III to Type II Porous Liquids by Tuning Surface Rigidity of Rhodium(II)‐Based Metal‐Organic Polyhedra for CO₂ Cycloaddition

Manish Kumar Dinker, Meng‐Meng Li, Kan Zhao, Mingrui Zuo, more

Angewandte Chemie > 135 > 31 > n/a - n/a

Porous liquids (PLs), a summation of porous hosts and bulky solvents bestowing permanent cavities, are the prominent emerging materials. Despite great efforts, exploration of porous hosts and bulky solvents is still needed to develop new PL systems. Metal‐organic polyhedra (MOPs) with discrete molecular architectures can be considered as porous hosts; however, many of them are insoluble entities....

article

Transformation of Type III to Type II Porous Liquids by Tuning Surface Rigidity of Rhodium(II)‐Based Metal‐Organic Polyhedra for CO₂ Cycloaddition

Manish Kumar Dinker, Meng‐Meng Li, Kan Zhao, Mingrui Zuo, more

Angewandte Chemie International Edition > 62 > 31 > n/a - n/a

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Low-melting cationic 3d-transition metal complexes of azole-based ligands

Effect of ionic liquids in unimolecular solvolysis reactions involving carbocationic intermediates

Spectroscopic investigations of Eu3+-complexes with ligands containing multiple diglycolamide pendant arms in a room temperature ionic liquid

An efficient regioselective reaction of indole with 2H-chromenes for the synthesis of new 4H-chromenes in environmentally benign media

Kinetics of ionic liquid-heteropolyanion salts catalyzed transesterification of oleic acid methyl ester: A study by sequential method

In situ STM studies of Bi(111)|1-ethyl-3-methylimidazolium tetrafluoroborate+1-ethyl-3-methylimidazolium iodide interface

Voltammetric study and electrodeposition of tellurium, lead, and lead telluride in room-temperature ionic liquid 1-ethyl-3-methylimidazolium tetrafluoroborate

(Liquid+liquid) equilibrium at T=298.15K for ternary mixtures of alkane+aromatic compounds+imidazolium-based ionic liquids

Spectroscopic and docking studies on the interaction between pyrrolidinium based ionic liquid and bovine serum albumin

Catalytic application of task specific ionic liquid on the synthesis of benzoquinazolinone derivatives by a multicomponent reaction

Study of intercalation compounds using ionic liquids into montmorillonite and their thermal stability

Palladium Enhanced Iron Active Site – An Efficient Dual‐Atom Catalyst for Oxygen Electroreduction

Bioderived Ionic Liquids with Alkaline Metal Ions for Transient Ionics (Small 36/2023)

Bioderived Ionic Liquids with Alkaline Metal Ions for Transient Ionics

Numerical modeling of novel cage‐like cross‐linked membranes for enhanced proton conductivity in a high temperature‐polymer electrolyte membrane fuel cell

Monitoring of Emulsion Polymerization in the Presence of Ionic Liquids Using NIR Spectroscopy

Confining organic cations in metal organic framework allows molecular level regulation of CO₂ capture

Catalytic Cracking of Polylactic Acid to Acrylic Acid

Transformation of Type III to Type II Porous Liquids by Tuning Surface Rigidity of Rhodium(II)‐Based Metal‐Organic Polyhedra for CO₂ Cycloaddition

Transformation of Type III to Type II Porous Liquids by Tuning Surface Rigidity of Rhodium(II)‐Based Metal‐Organic Polyhedra for CO₂ Cycloaddition

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