Synthesis, Structures and Properties of Two New Coordination Polymers with Unprecedented Water Cluster

Abstract

Two new complexes, [Eu 2 (NIPH) 2 (H 2 O) 14 ](HNIPH) 2 (H 2 O) 7 (1) [Co 2 (abtc)(phen) 4 (H 2 O)]Á12(H 2 O) (2) (H 2 NIPH = 5-nitroisophthalic acid, H 4abtc = 3,3 0 ,5,5 0 -azobenzenetetracarboxylic acid, phen = 1,10-phenanthroline, DMF = N,N 0 -dimethylformamide) have been synthesized and characterized by infrared spectrum, thermal gravimetric analysis, X-ray single crystal diffraction and photoluminescence properties. Complex 1 upon slow evaporation at room temperature gave a 0-D structure, and seven independent water molecules and their equivalent held together by hydrogen bonds with an ordered proton arrangement form a 1-D hydrogen-bonded water tape. An unusual water tape notated T10(0)A0 is observed in 2. A 1-D water tape by connecting five-ten-five membered water rings through hydrogen bonds. Multiple hydrogen bonds and p-p stacking interactions play important roles in the formation of the 3-D networks. Fascinatingly, these lattice water molecules display unprecedented water cluster and play important roles in the stabilizing the whole network.Keywords 5-Nitroisophthalic acid Á 3,3 0 ,5,5 0 -Azobenzenetetracarboxylic acid Á Water cluster Á Fluorescence Electronic supplementary material The online version of this article (