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Inorganics
Special Issues
Organometallic Ionic Liquid
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Organometallic Ionic Liquid

A special issue of Inorganics (ISSN 2304-6740). This special issue belongs to the section "Organometallic Chemistry".

Deadline for manuscript submissions: closed (30 April 2018)

Special Issue Editor

Prof. Dr. Mihkel Koel

E-Mail Website
Guest Editor
Department of Chemistry and Biotechnology, School of Science, Tallinn University of Technology, Ehitajate 5, 19086 Tallinn, Estonia
Interests: porous materials; biosourced materials; green chemistry; carbonaceous materials; energy and environmental applications; chromatograpy; neoteric solvents (ionic liquids, supercritical fluids)
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Ionic liquids (IL) are one of the most variable classes of compounds with very different physical and chemical properties. Using metal-containing anions as a structural component of ionic liquids has been common since the early days of research on ionic liquids. Metal-containing ionic liquids are regarded as materials that combine the properties of ionic liquids with additional intrinsic magnetic, spectroscopic, or catalytic properties, depending on the enclosed metal ion used.

Use of ILs spans over wide fields, from immobilizing solvent for metal catalysts and reaction media to catalysts, where ILs with metal-containing anions are active in diverse reactions. An ionic liquid in its liquid state is characterized by a highly- structured anion and cation net with a high degree of self-organization, which may favor a spontaneous, well-defined, and extended ordering of nanoscale structures. This phenomenon is increasingly being used for synthesizing different nanoparticles.

Metal-containing ILs, based on unique magnetic or spectroscopic properties, are gaining attention in the preparation of new sensors and analytical applications. Their electrical properties in several cases give new possibilities for the electrodeposition of metals that cannot be electrodeposited from traditional aqueous solutions.

However, more information is needed on the safety and environmental impacts relating to metal-containing ionic liquids in order to lower the barrier for their widespread industrial application.This Special Issue aims to highlight the structural and chemical diversity of organometallic ionic liquids and share the given extensive knowledge with a broader audience in order to assist this promising area to have a broader field of application.

Prof. Dr. Mihkel Koel
Guest Editor

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Inorganics is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • synthesis of metal containing ionic liquids
  • metal-containing ionic liquids
  • metal-containing eutectic-based ionic liquids
  • ordered nanostructures in ionic liquids
  • use of ionic liquids in extraction
  • catalysis with ionic liquids
  • electrochemistry with/in ionic liquids
  • metal plating in ionic liquids

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Published Papers (2 papers)

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Research

11 pages, 1443 KiB  
Article
Metal-Catalyzed Degradation of Cellulose in Ionic Liquid Media
by Tiina Aid, Mihkel Koel, Margus Lopp and Merike Vaher
Inorganics 2018, 6(3), 78; https://doi.org/10.3390/inorganics6030078 - 10 Aug 2018
Cited by 11 | Viewed by 4328
Abstract
Biomass conversion to 5-hydroxymethylfurfural (HMF) has been widely investigated as a sustainable alternative to petroleum-based feedstock, since it can be efficiently converted to fuel, plastic, polyester, and other industrial chemicals. In this report, the degradation of commercial cellulose, the isomerization of glucose to [...] Read more.
Biomass conversion to 5-hydroxymethylfurfural (HMF) has been widely investigated as a sustainable alternative to petroleum-based feedstock, since it can be efficiently converted to fuel, plastic, polyester, and other industrial chemicals. In this report, the degradation of commercial cellulose, the isomerization of glucose to fructose, and the conversion of glucose to HMF in 1-butyl-3-methylimidazolium chloride ([BMIM]Cl]) using metal catalysts (CrCl3, ZnCl2, MgCl2) as well as tungsten and molybdenum oxide-based polyoxometalates (POM) were investigated. Tungsten and molybdenum oxide-based POMs in ionic liquids (IL) were able to degrade cellulose to majority glucose and epimerize glucose to mannose (in the case of the molybdenum oxide-based POM). A certain amount of glucose was also converted to HMF. The tungsten oxide-based POM in IL showed good activity for cellulose degradation but the overall products yield remained 28.6% lower than those obtained using CrCl3 as a catalyst. Lowering the cellulose loading did not significantly influence the results and the addition of water to the reaction medium decreased the product yields remarkably. Full article
(This article belongs to the Special Issue Organometallic Ionic Liquid)
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11 pages, 2306 KiB  
Article
Effect of Water Content on Properties of Homogeneous [bmim]Fe(III)Cl4–H2O Mixtures and Their Application in Oxidative Absorption of H2S
by Jianhong Wang and Renren Ding
Inorganics 2018, 6(1), 11; https://doi.org/10.3390/inorganics6010011 - 8 Jan 2018
Cited by 10 | Viewed by 4560
Abstract
The potential of 1-butyl-3-methylimidazolium tetrachloroferrate ([bmim]Fe(III)Cl4) for replacing an iron(III) chelate catalytic solution in the catalytic oxidation of H2S is attributed to its no side reaction and no degradation of the chelating agent. The catalytic oxidation product of water [...] Read more.
The potential of 1-butyl-3-methylimidazolium tetrachloroferrate ([bmim]Fe(III)Cl4) for replacing an iron(III) chelate catalytic solution in the catalytic oxidation of H2S is attributed to its no side reaction and no degradation of the chelating agent. The catalytic oxidation product of water in non-aqueous [bmim]Fe(III)Cl4 possibly has an influence on the oxidative absorption of H2S. Water and hydrophobic [bmim]Fe(III)Cl4 mixtures at water volume percents from 40% to 70% formed separate phases after srirring, without affecting the oxidative absorption of hydrogen sulfide. Then, studies on the properties of homogeneous [bmim]Fe(III)Cl4–H2O mixtures at water volume percents in the range of 5.88–30% and above 80% reveal that these mixtures are both Brønsted and Lewis acids at vol % (H2O) ≤ 30%, and only Lewis acids at vol % (H2O) ≥ 80%. Raman spectra showed that [bmim]Fe(III)Cl4 was the dominating species at vol % (H2O) ≤ 30%, in contrast, [bmim]Fe(III)Cl4 decomposed into FeCl3·2H2O and [bmim]Cl at vol % (H2O) ≥ 80%. Further research on oxidative absorption of H2S by homogeneous [bmim]Fe(III)Cl4–H2O mixtures demonstrated that [bmim]Fe(III)Cl4 was reduced by H2S to [bmim]Fe(II)Cl4H and FeCl3·2H2O was reduced to FeCl2, at the same time, H2S was oxidized to S8. In addition, the decrease in acidity caused by increasing the water content increased the weight percent of absorbed H2S, and decreased volatile HCl emissions. However, it is difficult to prevent the suspended S8 generated at vol % (H2O) ≥ 80% from the formation of sulfur blockage. Therefore, oxidative absorption of H2S by [bmim]Fe(III)Cl4–H2O mixtures is feasible at vol % (H2O) < 80% without sulfur blockage. Full article
(This article belongs to the Special Issue Organometallic Ionic Liquid)
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