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(organic chemistry)
C3H4N2 One of a group of organic heterocyclic compounds containing a five-membered diunsaturated ring with two nonadjacent nitrogen atoms as part of the ring; the particular compound imidazole is a member of the group.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



(glyoxaline, 1,3-diazole) a heterocyclic base. Colorless crystals; boiling point, 256°C. Imidazole is readily soluble i n water and alcohol and moderately soluble in ether. It is aromatic, that is, readily undergoes halogenation, nitration, and sulfonation. The hydrogen of the NH group can be replaced by alkyl by the action of, for example, dimethylsulfate. Imidazole is prepared by reacting glyoxalwith ammonia and formaldehyde. Its derivatives (histamin, histidine, carnosine, pilocarpine) are widely distributed in the animal and plant worlds and have important biological significance. [10–416-6 ]

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
This suggested that the imidazolium surfactants successfully intercalated among the layers of MMTs.
The resonance signals of 3.03, 3.73, and 4.36 ppm are the chemical shifts of protons from -C[H.sub.2]C[H.sub.2]COOC[H.sub.3] and protons in imidazolium ring can be observed apart at 7.57, 7.60, and 8.93 ppm.
[sup.1][MSIMHSO.sub.4] as demonstrated in Figure 2(b) was synthesized with purity of >99% by direct metathesis between 3-methyl-1-sulfonic acid imidazolium chloride (MSIMCl) and [H.sub.2]S[O.sub.4] via the same method mentioned above.
This work aims at investigating 1-butyl-3-methyl imidazolium salts as latent catalysts for anhydride-cured epoxy oligomers and at studying the properties of polymers produced on their basis.
In our investigations 5 commercially available ionic liquids containing an ethyl substituent in the imidazolium ring (1-ethyl-3-methyl imidazolium, [Emim]) and 1 in a pyridinium ring (1-ethylpyridinium, [Epyr]) have been investigated.
Several hypercrosslinked porous polymers incorporated with imidazolium salts were prepared.
This result is in agreement with the general concept that imidazolium IL tends to act as entropic drivers for the formation nanostructured materials [21,34].
In particular, it was found that polymer nanoparticles containing imidazolium groups were able to convert epoxides with 100% selectivity and high yields to cyclic carbonates [81].
A range of carbon chain length of ionic liquids can help its dissolution; however, the hydrophobicity of an ionic liquid increases with the length of the alkyl chains on the imidazolium ring increasing, as shown elsewhere [43, 44], which leads to reduced solubility of shikimic acid.
Among the widely used organic surfactants are phosphonium, imidazolium, stibonium compounds, and organic amines such as octadecylamine, hexadecylamine, dodecylamine, and octylamine.