New N-heterocyclic carbene ligand precursors H2C(HTzR)2} and H2C(HImR)2} (HTz = 1,2,4-triazole; HIm = imidazole; R = PrSO3 or EtCOO) were obtained starting from the compounds bis(1,2,4-triazol-1-yl)methane and bis(imidazol-1-yl)methane. The related silver(I) carbene complexes were prepared in degassed water solution by treatment of the triazolium or imidazolium species with Ag2O, resulting in well-characterized and water soluble bimetallic complexes of general formula Na2[H2C(TzR)2]2Ag2} and Na2[H2C(ImR)2]2Ag2}. In these metallacycles every silver atom is coordinated to two triazolin- or imidazolin-2-ylidene rings, belonging to two different dicarbene units.
从双(
1,2,4-三唑-1-基)
甲烷和双(
咪唑-1-基)
甲烷出发,得到了新型N-杂环卡宾
配体前体H2C(HTzR)2}和H2C(HImR)2}(HTz=
1,2,4-三唑;HIm=
咪唑;R=PrSO3或EtCOO)。通过用
Ag2O处理三唑镛或
咪唑镛物种,在脱气
水溶液中制备了相关的
银(I)卡宾配合物,得到了具有明确结构且
水溶性的双
金属配合物,其通式为Na2[H2C(TzR)2]2Ag2}和Na2[H2C(ImR)2]2Ag2}。在这些
金属环中,每个
银原子都与两个三唑林-或
咪唑林-2-亚甲基环配位,这些环属于两个不同的二卡宾单元。