Novel Ag(I) complexes with azole heterocycle ligands bearing acetic acid group: synthesis, characterization and crystal structures

Four novel Ag-I coordination complexes with azole heterocycle ligands bearing acetic acid group, [AgL1](n) (1), [Ag((LHL2)-H-2)](n) (2), [AgL3](n) (3) and [Ag(L-4)](n) (4) (here, HL1 = 1H-imidazole-1-acetic acid, HL2 = 1H-benzimidazole-1-acetic acid, HL3 = 1H-1,2,4-triazole-1-acetic acid, HL4 = 1H-benzotriazole1-acetic acid), have been synthesized and structurally characterized by elemental analysis, IR and X-ray diffraction. Structural analyses show that complex 1 possesses a two-dimensional structure, which contains silver chains formed by weak Ag-Ag interactions, and 2 consists of neutral chains connected by weak bonds (O center dot center dot center dot H center dot center dot center dot O), while 3 and 4 have a three-dimensional network and a one-dimensional chain structure, respectively. It is interesting that in 1 there exist Ag-Ag interactions with a separation of 3.156 angstrom, which play an important role in the formation of the complex. Furthermore, the conductivity of 1 was studied in the powder state.