Thermal, fluorescence, solution and structural studies of one-dimensional AgI coordination polymer with Ag–Ag and Ag–π interactions

[Ag3(μ-2-bpc)3]n · n/2H2O (2-Hbpc = biphenyl-2-carboxylic acid) (1), a new rarely reported AgI one-dimensional coordination polymer with Ag–Ag and Ag–π interactions, has been synthesized, characterized by elemental analysis and IR spectroscopy and its structure determined by single-crystal X-ray diffraction. The thermal stability of compound 1 was studied by thermal gravimetric (TG) and differential thermal analyses (DTA). The single-crystal X-ray analysis of compound 1 shows that the complex consists of [Ag3(μ-2-bpc)3] subunits containing of three different Ag environments. Solution- and solid-state luminescent spectra of the ligand 2-Hbpc and compound 1 indicate emission band with the maximum intensity at 360 and 370 nm upon excitation at 300 nm, respectively. The results of studies of the stoichiometry and formation of complex in DMF solution were found to be in support of their solid-state stoichiometry.