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

Abstract

Four novel Ag^I coordination complexes with azole heterocycle ligands bearing acetic acid group, [AgL¹]_n (1), [Ag(L²HL²)]_n (2), [AgL³]_n (3) and [Ag(L⁴)]_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-benzotriazole-1-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⋯H⋯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 Å, which play an important role in the formation of the complex. Furthermore, the conductivity of 1 was studied in the powder state.