Supramolecular assembly of coordination networks in silver(I) triple salts containing acetylenediide and some N,O-donor ligands

Five new silver(I) triple salts: (Ag2C2)(AgNO3)4(AgL1)2(L1H)2 (1), (Ag2C2)(AgCF3CO2)2(AgL1)2(L1H)1/2 (2), [(Ag2C2)(AgCF3CO2)4(L2)(H2O)] · (L2H2) (3), (Ag2C2)(AgNO3)3(AgL3)2 (4), and [(Ag2C2)(AgCF3CO2)4(AgL3)2(H2O)2] · H2O (5) (L1H = nicotinic acid, L2H = isonicotinic acid, L3H = 2-pyrazinecarboxylic acid) have been synthesized by the hydrothermal method. All five compounds contain polyhedral silver(I) cages each encapsulating an acetylenediide dianion, C22-. In 1, C2@Ag8 cages in the shape of bicapped trigonal prisms are interlinked by nitrate, L1, and L1H ligands into a three-dimensional architecture. In 2, silver(I) columns generated from fusion of triangulated dodecahedra are linked by L1 into a layer structure. Compound 3 provides a rare example of a (L2H2)+-pillared three-dimensional structure via hydrogen bonding. In 4, nitrate ligands together with L3 link the C2@Ag7 cages into a three-dimensional architecture. Compound 5 also exhibits a three-dimensional architecture generated from trifluoroacetate and L3-linked C2@Ag8 cages.