Abstract
A novel cadmium bipyridine complex, [Cd(bipy)3(H2O)2]n·2n(Et-Bipy)·n(bipy)·2nCl (1) (bipy = 4,4’-bipyridine, Et = ethyl group), has been prepared via a solvothermal reaction and structurally characterized by single-crystal X-ray diffraction. Complex 1 features a one-dimensional (1-D) structure with the cadmium ion surrounded by four nitrogen atoms of four bipy ligands and two oxygen atoms of two coordinating water molecules, yielding a six-fold coordinating octahedron of CdN4O2. A photoluminescence investigation with solid-state sample reveals that complex 1 displays an intensive emission in the green region. A time-dependent density functional theory (TDDFT) calculation reveals that this photoluminescence emission could be attributed to the π-π* charge transfer of the 4,4’-bipyridine moieties. Solid-state diffuse reflectance measurements show the existence of a wide and direct optical band gap of 4.95 eV.
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