Syntheses, structures, and properties of silver(I) polymeric architectures assembled by [2+2] or [2+3] metallomacrocyclic motif and angular ligands

Abstract

Four new silver(I) polymeric architectures with dimeric and trimeric units, namely [Ag 2( L1) 2(NO 3) 2] n ( 1), [Ag 2( L2) 2(NO 3) 2] n ( 2), {[Ag 3( L3) 2(NO 3) 2](NO 3)} n ·2nCH 3OH ( 3) and [Ag 4( L4) 4](NO 3) 4·6CH 3CN ( 4) ( L1 = terephthalaldioxime, L2 = isophthalaldioxime, L3 = ( E)- N-[2-(pyridin-2-yl)isoindolin-1-yl-idene]pyridine-2-amine, and L4 = 1,3-bis(3-pyridylaminomethyl)benzene), have been synthesized and characterized by the element analysis, IR, TG, PL, and single-crystal X-ray diffraction. Each ligand acts as bidentate or tridentate mode and every two ligands ligates a pair of silver(I) ions or three resulting in [2+2] or [2+3] metallomacrocyclic motif. Complexes 1 and 2, which assemble from similar angular ligand, exhibit layer or chain structure extended via interconnection of the dimeric units by NO 3 - anions. Complex 3 is a 1-D helical chain extended via interconnection of trimeric units by NO 3 - anions, in which the trimeric unit is further stabilized by intracyclic Ag⋯Ag and π–π interactions. Two independent dimeric units in complex 4 are separately linked through hydrogen-bonding into a 2-D twofold interpenetrating networks. The investigation of luminescent properties demonstrates that complexes 2, 3 and 4 exhibit intraligand emission bands in the blue, green and purple light region at room temperature, respectively.