Encapsulated Diverse Water Aggregates in Two Ag(I)/4,4′-Bipyridine/Dicarboxylate Hosts: 1D Water Tape and Chain

Abstract

Two mixed-ligand Ag(I) coordination polymers (CPs), namely, [Ag2(bipy)2(ox)·7H2O]n (1) and [Ag2(bipy)2(adip)·6H2O]n (2) (bipy = 4,4′-bipyridine, H2ox = oxalic acid, H2adip = adipic acid) have been synthesized and structurally characterized. Complex 1 exhibits a three-dimensional (3D) framework constructed from ox pillared Ag−bipy sheets. Complex 2 shows a stairlike two-dimensional (2D) structure composed of adip linked Ag−bipy double chains. Of particular interest, a 1D C4 water chain and a novel 1D T7(2) water tape constructed from edge-sharing heptamer water clusters coexist in complex 1, while a 1D C6 water chain exists in complex 2. Comparing the experimental results, it is comprehensible that the dicarboyxlates play crucial roles in the formation of the diverse structures and water aggregates. Additionally, results about thermogravimetric curves and photoluminescence spectra were discussed.