A propargyl-functionalized salt, 1-(2-methoxyethyl)-3-(prop-2-ynyl)benzimidazolium bromide (1), was prepared. 1-(2-methoxyethyl)-3-[(1-phenyl-1H-1,2,3-triazol-4-yl)methyl]benzimidazolium hexafluorophosphate (2) and 1-(2-methoxyethyl)-3-[(1-(4-nitrophenyl)-1H-1,2,3-triazol-4-yl)methyl]benzimidazolium hexafluorophosphate (3) were obtained by Cu(I) catalyzed azide-alkyne cycloaddition reaction of 1 with corresponding azides. Compound 3 was transformed to 1-(2-methoxyethyl)-3-[(1-(4-aminophenyl)-1H-1,2,3triazol-4-yl)methyl]benzimidazolium hexafluorophosphate (4) by reduction reaction with hydrazine monohydrate. The structures of these propargyl-and 1,2,3-triazolyl-functionalized benzimidazolium salts were elucidated by FT-IR, 1 H NMR, 13 C NMR and elemental analysis methods.

Three new dibenzimidazolium salts bridged by 2-methylenepropane-1,3-diyl group were synthesized. Their dinuclear N-heterocyclic carbene Ag(I) complexes were prepared by the reactions of these salts with Ag 2 O. The structures of the synthesized compounds were defined by NMR, FT-IR, elemental analysis and LC-MSMS (for complexes) techniques. Stability of the silver complexes was confirmed by 1 H NMR spectroscopy. Catalytic activities of Ag(I) compounds were tested for three-component coupling reaction of some aldehydes, amines and phenylacetylene.

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A cationic N-heterocyclic carbene copper(I) complex was prepared and characterized by FT-IR, 1 H NMR, 13 C NMR, elemental analysis and ESI/TOF mass spectrometry methods. Catalytic performances of the complex were studied in the [3+2] cycloaddition reaction of some azides and alkynes.

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