Hexahalometallate salts of trivalent scandium, yttrium and lanthanum: cation–anion association in the solid state and in solution
作者:Martin J. D. Champion、William Levason、David Pugh、Gillian Reid
DOI:10.1039/c6nj01068g
日期:——
The hydrogen bonding of hexahalometallate anions with various organic cations is explored via crystallographic and solution NMR studies.
六卤金属阴离子与各种有机阳离子的氢键作用通过晶体学和溶液NMR研究进行探讨。
Novel perfluoroalkanesulfonamide compounds
申请人:Umemoto Teruo
公开号:US20070093678A1
公开(公告)日:2007-04-26
The present invention provides compounds represented by the formula Y
+−
N(SO
2
R
f
)(CF
3
). Such a compound can be manufactured through a reaction between M
+−
N(SO
2
R
f
)(CF
3
) and Y
+−
B. The present invention also provides compounds represented by the formula Y
+−
N(SO
2
R
f
)(CN). Such a compound can be manufactured through a reaction between M
+−
N(SO
2
R
f
)(CN) and Y
+−
B. R
f
in the above formulae is a perfluoroalkyl group. Y
+
is an organic or inorganic cation.
−
B is an organic or inorganic anion. M
+
is an alkali metal cation or a silver cation.
Halogen-free chelated orthoborate ionic liquids and organic ionic plastic crystals
作者:Faiz Ullah Shah、Sergei Glavatskih、Pamela M. Dean、Douglas R. MacFarlane、Maria Forsyth、Oleg N. Antzutkin
DOI:10.1039/c2jm12657e
日期:——
Five halogen-free orthoborate salts comprised of three different cations (cholinium, pyrrolidinium and imidazolium) and two orthoborate anions, bis(mandelato)borate and bis(salicylato)borate, were synthesised and characterised by DSC, X-ray diffraction and NMR. DSC measurements revealed that glass transition points of these orthoborate salts are in the temperature range from −18 to −2 °C. In addition, it was found that [EMPy][BScB] and [EMIm][BScB] salts have solid–solid phase transitions below their melting points, i.e. they exhibit typical features of plastic crystals. Salts of the bis(salicylato)borate anion [BScB]− have higher melting points compared with corresponding salts of the bis(mandelato)borate anion [BMB]−. Single crystal X-ray diffraction crystallography (for [Chol][BScB] crystals) and solid-state multinuclear (13C, 11B and 15N) NMR spectroscopy were employed for the structural characterisation of [Chol][BScB], [EMPy][BScB] and [EMIm][BScB], which are solids at room temperature: a strong interaction between [BScB]− anions and [Chol]+ cations was identified as (i) hydrogen bonding between OH of [Chol]+ and carbonyl groups of [BScB]− and (ii) as the inductive C–H⋯π interaction. In the other salt, [EMIm][BScB], anions exhibit π⋯π stacking in combination with C–H⋯π interactions with [EMIm]+ cations. These interactions were not identified in [EMPy][BScB] probably because of the lack of aromaticity in cations of the latter system. Our data on the formation of a lanthanum complex with bis(salicylato)borate in the liquid mixture of La3+(aq) with [Chol][BScB] suggest that this class of novel ILs can be potentially used in the extraction processes of metal ions of rare earth elements.
Ionic liquid containing electron-rich, porous polyphosphazene nanoreactors catalyze the transformation of CO<sub>2</sub> to carbonates
作者:Zhangjun Huang、Jorge G. Uranga、Shiliu Zhou、Haiyan Jia、Zhaofu Fei、Yefeng Wang、Felix D. Bobbink、Qinghua Lu、Paul J. Dyson
DOI:10.1039/c8ta08856j
日期:——
simultaneously capture and transform CO2 into carbonates. The PPZ nanospheres swell in organic solvents and effectively absorb IL cations by virtue of the electron-rich sites, while leaving the anions exposed and increasing their nucleophilicity. This leads to considerably higher catalytic activity compared to the IL alone in the cycloaddition reaction of CO2 to epoxides. The cation shielding effect
N-Heterocyclic Olefin-Carbon Dioxide and -Sulfur Dioxide Adducts: Structures and Interesting Reactivity Patterns
作者:Lars H. Finger、Jannick Guschlbauer、Klaus Harms、Jörg Sundermeyer
DOI:10.1002/chem.201602973
日期:2016.11.2
solution, CO2adducts of N‐heterocyclic carbenes (NHCs) and N‐heterocyclic olefins (NHOs) have been found to be in fully reversible equilibrium with the corresponding methyl carbonate salts [EMIm][OCO2Me] and [EMMIm][OCO2Me]. The reactivity pattern of representative 1‐ethyl‐3‐methyl‐NHO–CO2 adduct4 has been investigated and compared with the corresponding NHC–CO2 zwitterion: The protonation of 4 with HX