Silver(i)–organic frameworks constructed from silver(i) 3,6-pyrazyldiethynide and 3,8-1,10-phenanthrolyldiethynide complexes

Abstract

Two diynes bearing functional groups with different binding modes, 3,6-diethynylpyrazine (H₂L1) and 3,8-diethynyl-1,10-phenanthroline (H₂L2), were utilized as ligands to synthesize two new organometallic units, Ag₂L1·3AgNO₃ (1) and Ag₂L2·6AgNO₃ (2), in order to investigate the effect of the bridging and chelating modes of the ligands on the structures of networks constructed from silver-ethynide compounds. Structural studies show that in 1, silver-ethynide cluster units aggregate to form chair-like organometallic slides through Ag–N coordination bonds. These slides are linked through argentophilic interaction to generate novel 2D ladder-like layers, and are further bridged by nitrate anions to afford a 3D network in the solid state. It is observed that all the Ag ions in one layer interact to afford a 2D silver network. However, in 2, the silver-ethynide cluster units only interact to generate unique sine wave-like organometallic chains through argentophilic interaction, which are further connected by nitrate anions to form a 3D network. In the solid state, both 1 and 2 are luminescent at room temperature.