Add time:07/12/2019         Source:sciencedirect.com

Two mesityl bridged bis-1H-imidazolium salts having bromide/hexafluorophosphate counter ions have been prepared, compared with similar ortho-xylyl bridged salts and characterized by various spectral and X-ray diffraction techniques. The salt having 2-cyanoethyl substituents undergoes hydrolysis to produce compartmental 1H-imidazolium salts. Further, these salts are involved in the Hofmann-type elimination to produce bis-imidazole and Ag(I)- and Hg(II)-coordination compounds when treated with Ag2O and Hg(OAc)2 in different ratios. Furthermore, a 3-nitrile-substituted imidazolium salt was prepared and treated with the aforementioned metal sources to evaluate the elimination reaction. However, it forms stable N-heterocyclic carbene (NHC) complex without eliminating any of the cyano-substitutions. Both, imidazolium salts and Ag(I)- and Hg(II)-coordination/NHC complexes have been characterized by 1H and, 13C NMR, FTIR spectral, and elemental and single crystal X-ray diffraction analyses.

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