Synthesis and characterization of new Ag(I) coordination networks based on saccharinate and bis(isopropylimidazole) ligands exhibiting very close C-H...Ag interactions

Abstract

Two Ag(l) coordination networks, formulated as [Ag(sac)(mu-bisopib)](n) (1) and [Ag(sac)(mu-pbisopix)].H2O (2), have been synthesized based on the bis(isopropylimidazole) ligands 1,4-bis(2-isopropyl-1H-imidazol-1-yl)butane (bisopib) and 1,4-bis((2-isopropyl-1H-imidazol-1-yl)methyl)benzene (pbisopix), respectively, along with saccharinate (sac) ligands. All the complexes were characterized by elemental analysis, IR spectroscopy and single-crystal X-ray diffraction studies. The X-ray crystallographic studies of 1 and 2 revealed that the Ag(I) ions are mu-bridged by the bis(isopropylimidazole) derivative ligands to generate 1D zig-zag polymer and dinuclear structures, respectively. As far as we know, complex I shows the closest C-H...Ag interaction distance among similar literature examples. In complex 1 adjacent 1D coordination polymers are further joined by C-H...O hydrogen bonds and pi...pi interactions, generating a 3D supramolecular network. The C-H...O hydrogen bonds and C-H...pi interactions play a crucial role in the architecture of the 3D network of complex 2. Thermal decompositions and photoluminescent properties of the Ag(I) complexes are also discussed herein. (C) 2016 Elsevier Ltd. All rights reserved.