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

At ambient temperature, two silver(I) complexes [Ag(4)(SO(4))(2)(dppm)(4)]center dot 5CH(3)CH(2)OH center dot 1/2H(2)O (1) and [Ag(2)(SO(4))(dppm)(2)(2-ampz)]center dot CH(3)OH center dot H(2)O (2) (dppm = bis(diphenylphosphino)methane, 2-ampz = 2-aminopyrazine) were obtained by the reaction of Ag(2)SO(4) with dppm in the presence of pyrazine or 2-aminopyrazine. They are characterized by IR, X-ray crystallography, luminescence and (1)H, (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 mu(3)-O, O', O' and unique mu(4)-O, O, O', O' bonding modes respectively, while SO(4)(2) anion in 2 adopts mu-O, O' bonding mode. (C) 2010 Elsevier B.V. All rights reserved.