Unusual very strong O-H·O hydrogen bonding in zinc complex: Crystal structure and photoluminescence of [Zn(HL)(bpy) _2(H _2O)] _2 (L) (L = O _2C(CF _2) _6CO _2, bpy = 2,2'bipyridine)

摘要

The centrosymmetric dimer zinc compound, [Zn(HL)(bpy) _2(H _2O)] _2 (L), (L = O _2C(CF _2) _6CO _2, bpy = 2,2'-bipyridine), was obtained through the reaction of Zn(ClO _4) _2·6H _2O, bpy and perfluorosuberic acid. Zn(II) centre is coordinated by four N atoms from two bpy ligands and two O atoms from a water molecule and monoanionic suberate ligand in a distorted octahedral coordination environment. The unit structure contains crystallographically centrosymmetric suberate anion which acts as a bidentate bridging ligand between each cationic monomer complex unit via hydrogen bonding. The very strong interaction of hydrogen bonding of hydoxycarbonyl-carboxylate system in solid state has O-H?O 2.436(3) ? (O?H = 1.25(6) ? and H?O = 1.19(6) ?). These units are also connected to each other via p?π, C-H?π, C-F?π and F?F stacking interactions, C-H?O, O-H?O and C-H?F hydrogen bonds giving rise to a multi-dimensional network. The complex is the first reported example of a coordination compound based on both bpy ligands together with perfluorosuberic acid. Moreover, compound exhibit intense solid state fluorescent emissions at room temperature.