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Poly[mu2-4,4'-bipyridine-di-mu2-bromido-cadmium(II)], with novel colour-tunable fluorescence
Wen Tong Chen1, Xiao Niu Fang, Qiu Yan Luo
1College of Chemistry and Chemical Engineering, JiangXi Province Key Laboratory of Coordination Chemistry, JingGangShan University, 343009 Ji'an, JiangXi, People's Republic of China. wtchen@jgsu.edu.cn
Abstract:
The title inorganic-organic hybrid complex, [CdBr2(C(10)H(8)N(2))]n, features two-dimensional [CdBr2(4,4'-bipy)]n (4,4'-bipy is 4,4'-bipyridine) neutral networks, based on the octahedral Cd atom coordinated by four mu2-Br and two mu2-4,4'-bipy at trans positions, yielding a CdBr(4)N(2) octahedron. It crystallizes in the orthorhombic system (Cmmm). All the crystallographically independent atoms are on special positions, namely Cd on mmm, Br on mm, N on mm2, and C on sites of symmetry m or mm2. Optical absorption spectroscopy reveals the presence of an optical gap of 3.76 eV, indicating that the complex is a wide-gap semiconductor. Photoluminescence investigation reveals that the complex displays strong colour-tunable emissions, which might originate from a ligand-to-ligand charge-transfer (LLCT) transition. Thermogravimetric differential thermal analysis shows that the complex is thermally stable up to 493 K.
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