Structure Diversity of C2@Agn Cages Consolidated by Heteroaromatic N‑Donor Ligands in Silver Ethynediide Complexes

Seven new silver ethynediide complexes containing ancillary heteroaromatic N-donor ligands, namely, Ag2C2·4AgCF3CO2­·(bipyH)­(CF3CO2)­·H2O (1), Ag2C2­·7AgCF3CO2­·(H3O)­(CF3CO2)­·2­(bipyH2)­(CF3CO2)2­·3H2O (2), 2Ag2C2­·8AgCF3CO2·6L1 (L1 = pyrazole) (3), Ag2C2­·4AgCF3CO2­·2L2 (L2 = 3,5-dimethylpyrazole) (4), Ag2C2­·4AgCF3CO2­·2L3 (L3 = 1,2,4-triazole) (5), Ag2C2­·10AgCF3CO2­·2L4 (L4 = 4,5-dihydro-3-(4-pyridinyl)-2H-benz­(g)-indazole) (6), and Ag2C2­·5AgCF3CO2­·2­(H3O)­(CF3CO2)­·3­(AgL52)­(CF3CO2)­·2­(L5H)­(CF3CO2)­·2­(H2O) (L5 = benzimidazole) (7) have been synthesized under hydrothermal conditions and characterized by single crystal X-ray analysis. Directed by N-donor ligands of different bulkiness and disposition of coordinating sites, various silver chain-type architectures (compounds 1 and 3–6) and discrete molecular structures (2 and 7) were assembled. In the case of 1 and 2, the influence of nonincorporated additive agents (NH4)2HPO4 and H2C2O4·H2O on product formation was also investigated.