The synthesis, structure, and luminescence of two silver(I)-dppm complexes based on sulfate anion and nitrogen heterocyclic ligands

摘要

At ambient temperature, two silver(I) complexes [Ag_4(SO _4)_2(dppm)_4]·5CH_3CH _2OH·1/2H_2O (1) and [Ag_2(SO _4)(dppm)_2(2-ampz)]·CH_3OH·H _2O (2) (dppm = bis(diphenylphosphino)methane, 2-ampz = 2-aminopyrazine) were obtained by the reaction of Ag_2SO_4 with dppm in the presence of pyrazine or 2-aminopyrazine. They are characterized by IR, X-ray crystallography, luminescence and ~1H, ~(31)P NMR spectroscopy. Complex 1 is a tetranuclear cluster. In complex 2, the units [Ag_2(SO_4)(dppm)_2] are connected by 2-aminopyrazine to form a 1D linear polymer. Due to the subtle interactions of different nitrogen heterocyclic ligands with silver ions, two SO _4~(2-) anions in 1 adopt μ_3-O, O′, O′ and unique μ_4-O, O, O′, O′ bonding modes respectively, while SO_4~(2-) anion in 2 adopts μ-O, O′ bonding mode.