Substituted (benzoimidazol-2-yl)Methanamines in Silver(I) Complexation in the Presence of Boron Cluster Anions

Abstract

Silver(I) complexation with substituted (benzoimidazol-2-yl)methanamines Bz–CH₂–NH–R (Bz is 1-methylbenzimidazole, R is anisole (L¹) or 1-isopropylbenzimidazole (L²)) in the presence of boron cluster anions [B_nH_n]^2– (n = 10, 12) has been studied for the first time. The influence of substituent R in the benzimidazole derivative on the composition and structure of the resulting compounds has been determined. Coordination compounds [Ag(L¹)₂]_xAn (x = 1, An = {Ag[B₁₀H₁₀]}_m^m–; x = 2, An = [B₁₂H₁₂]^2–), featuring closo-borate anions in the outer coordination sphere and monodentately coordinated ligands L¹, have been synthesized and structurally characterized. Additionally binuclear complexes [Ag₂(L²)₂[µ-B_nH_n]] have been obtained, in which L² is coordinated bidentately, forming a seven-membered metallacycle, while anions [B_nH_n]^2– (n = 10, 12) act as bridging ligands. The structural features of the synthesized compounds have been analyzed, including the coordination mode of the organic ligands and the occurrence of positional and bond isomerism in compounds with coordinated boron cluster anions.