Syntheses, structures, photoluminescences of silver(I) coordination polymers with 2-aminopyrazine and varied dicarboxylate ligands

Abstract

Four new silver(I) coordination polymers, namely [Ag(NH 2pyz)(ox) 0.5] n ( 1), [Ag(NH 2pyz)(adp) 0.5·2H 2O] n ( 2), [Ag 2(NH 2pyz) 2(bdc)·H 2O] n ( 3) and [Ag 2(NH 2pyz) 2.5(ndc)] n ( 4) [NH 2pyz = 2-aminopyrazine, ox = oxalate anion, adp = adipate anion, bdc = 1,4-benzenedicarboxylate anion, ndc = 1,4-naphthalenedicarboxylate anion] have been synthesized by solution phase ultrasonic reactions of Ag 2O with heterocyclic NH 2pyz and various dicarboxylates under ammoniacal conditions. The complexes were characterized by elemental analyses, IR spectra and single-crystal X-ray diffraction. Complex 1 is a three-dimensional (3D) framework with an α-ThSi 2 topology. Complex 2 features a 2D 4 4 -sql net involving infinite 1D double Ag-NH 2pyz chains and flexible adp anion spacers. Complex 3 is a 3D framework in which 1D single Ag-NH 2pyz chains are pillared by bdc anions to form a 2D 6 3 -hcb network, adjacent 2D networks are packed into a 3D framework through bridging O atoms of dbc anions. Complex 4 is a 2D structure built from infinite 1D stair-like chains containing finite Ag 4(NH 2pyz) 5 subunits. The results show that the structural diversity of the complexes result from the nature of the dicarboxylate ligands. The photoluminescence properties of the complexes were also investigated in the solid state at room temperature.