145022-44-2Relevant articles and documents
Structural factors to improve physico-chemical properties of zwitterions as ion conductive matrices
Narita, Asako,Shibayama, Wataru,Ohno, Hiroyuki
, p. 1475 - 1482 (2006)
Thermal properties and ion conductive characteristics of equimolar mixtures of zwitterion and lithium salts (Z/L mixtures) have been investigated. Through a systematic study of their structure-property relationship, we describe a zwitterion structure that produces high ionic conductivity when the zwitterion is mixed with lithium salt. We found that a pure zwitterion containing imide anion melted at 87 °C and the melting point of pure zwitterions was lowered in proportion to the alkyl spacer chain length between the anion and cation sites. In Z/L mixtures, ionic liquid-like domain formed between the cation sites of zwitterions and the anions of lithium salts regardless of the anion structure of the zwitterions. However, the anion structure affected the transference number of the lithium cation in the Z/L mixtures. To improve the thermal stability and the ionic conductivity of Z/L mixtures, suitable alkyl chain length between the cation and anion sites was determined to be 5 to 7 CH2 units. The Royal Society of Chemistry 2006.
Ionothermal synthesis of new cobalt and chromium thiophosphate anions [Co(Co(P3S8)2)2]4- and [Cr(P3S9)2]3-
Cody, Jason A.,Dalecky, Lauren M.,Juillerat, Christian A.,Alexander, Grant C.B.,Shylanski, Luke C.
, p. 399 - 402 (2016)
Two new metal thiophosphate anions, [Co(Co(P3S8)2)2]4- and [Cr(P3S9)2]3-, have been isolated as single crystals of EMIM (1-ethyl-3-methylimidazolium) salts from ionothermal reaction of the elements in [EMIM][CF3SO3]. The former compound is structurally unique from known thiophosphate anions, contains three cobalt ions in two different coordination environments and oxidation states, and has bridging, polydentate P3S83- groups that coordinate to the cobalt ions through both S and P ions. The chromium thiophosphate anion contains octahedrally-coordinated Cr ions and is structurally similar to the known ion [Ni(P3S9)2]4-. The structures of both salts were determined by single-crystal X-ray diffraction. Both compounds were characterized by EDX and IR spectroscopies.
A sequential one-pot strategy for the synthesis of triterpenoid saponins in ionic liquid [emim][otf]
Song, Yiming,Guo, Tiantian,Liu, Qingchao,Song, Weiguo,Li, Fahui
, p. 20 - 25 (2019)
1-Ethyl-3-methylimidazolium trifluoromethanesulfonate ([emim][OTf]) is an efficient co-solvent and co-promoter for one-pot sequential glycosylation with the combined use of thioglycosides and trichloroacetimidates (or N-phenyltrifluoroacetimidates) donors
ZnO Nanoparticle Formation from the Molecular Precursor [MeZnOtBu]4by Ozone Treatment in Ionic Liquids: in-situ Vibrational Spectroscopy in an Ultrahigh Vacuum Environment
Bauer, Tanja,Voggenreiter, Markus,Xu, Tao,W?hler, Tobias,Agel, Friederike,Pohako-Esko, Kaija,Schulz, Peter,D?pper, Tibor,G?rling, Andreas,Polarz, Sebastian,Wasserscheid, Peter,Libuda, J?rg
, p. 31 - 40 (2017)
As reported previously, novel ZnO nanostructures can be grown by oxidation of [MeZnOtBu]4“building blocks” with O3in ionic liquids (ILs). In this study, we have explored the role of the IL during ZnO formation by in-situ infrared reflection absorption spectroscopy (IRAS) in ultrahigh vacuum (UHV). [MeZnOtBu]4and [C2C1Im][OTf] were (co-)deposited as thin films by physical vapor deposition (PVD) onto Au(111), separately or simultaneously. The IR spectrum of [MeZnOtBu]4was analyzed between 300 and 4000 cm–1based on calculated spectra from density-functional theory (DFT). Spectral changes in the IL-related bands during the thermal treatment of [MeZnOtBu]4in [C2C1Im][OTf] indicate the loss of the precursor ligands and the interaction of the IL with the growing ZnO aggregates. The films were treated with ozone (10–6mbar) in UHV and the spectral changes were monitored in-situ by IRAS. Slow ozonolysis of [C2C1Im][OTf] is observed. Spectroscopically we identify the primary ozonide formed by addition of O3to [C2C1Im]+and suggest a reaction mechanism, which leads to a biuret derivative. Upon ozone treatment of mixed [MeZnOtBu]4/[C2C1Im][OTf] films, ZnO aggregates are formed at the IL/vacuum interface. Ozonolysis of [C2C1Im][OTf] is suppressed. Upon annealing to 320 K, further ZnO aggregates are formed, leading to enclosure of [C2C1Im][OTf] in the ZnO film. At 380 K the IL is released from the mixed film. The pure [C2C1Im][OTf] desorbs at 420 K, leaving behind the ZnO phase.
Ultrafast dynamics in aromatic cation based ionic liquids: A femtosecond raman-induced kerr effect spectroscopic study
Shirota, Hideaki,Kakinuma, Shohei,Takahashi, Kotaro,Tago, Akito,Jeong, Hocheon,Fujisawa, Tomotsumi
supporting information, p. 1106 - 1128 (2016/10/11)
We studied the ultrafast dynamics of 40 aromatic cation based ionic liquids (ILs) by means of femtosecond Ramaninduced Kerr effect spectroscopy. The low-frequency Kerr spectra (ca. 0.3700 cm1) of the ILs were obtained from the Kerr transients by Fourier-Transform deconvolution analysis. The low-frequency Kerr spectra in the frequency range less than 200 cm-1 coming mainly from the intermolecular vibrations for the ILs were discussed in terms of (i) anion dependence, (ii) imidazolium cations vs. pyridinium cations, (iii) alkyl group dependence, and (iv) effect of methylation in aromatic cations. Several liquid properties, such as density, viscosity, electrical conductivity, and surface tension, of the present sample ILs at 293K were also estimated in this study. We clarified that the aromatic cation based ILs show a different relation of the first moment of the low-frequency spectral band to the bulk liquid parameter, which is the square root of surface tension divided by liquid density, from aprotic molecular liquids. The slope of the first moment to the bulk parameter for the aromatic cation based ILs is gentler than that for aprotic molecular liquids.