- Synthesis and characterization of three new Cd(II) coordination polymers with bidentate flexible ligands: Formation of 3D and 1D structures
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Three new coordination polymers of {[Cd(bib)3](ClO4)2}n (1), [Cd(μ2-bip)2(N3)2]n (2) and [Cd(μ-bibMe)Cl2]n (3) were prepared by using the neutral N-donor ligands 1,4-bis(imidazolyl)butane (bib), 1,3-bis(imidazolyl)propane (bip) and 1,4-bis(2-methylimidazolyl)butane (bibMe) and CdX2 (X = ClO4 ?, N3 ? and Cl?). The results of the X-ray measurements demonstrate that in the crystal structure of 1 and 2 the cadmium(II) ion adopts CdN6 octahedral geometry while, in the structure of 3, the metal ion forms CdN2Cl2 tetrahedral geometry. In compound 1, six bib ligands are coordinated to one central cadmium(II) to form an open 3D 2-fold interpenetrating framework of the α-polonium (pcu) type topology, while in compound 2 and 3 the N3 ? or Cl? groups are terminally bonded to the metal center and each linker compound (bip or bibMe) acts as bridging ligand connecting two metal ions to form a one-dimensional zig-zag chain. The adjacent 1D chains of complex 2 and 3 are further extended into a non-covalent 2D network structure by C–H?N and C–H?Cl intermolecular hydrogen bonds, respectively. The complexes were characterized by elemental analysis, IR spectroscopy and single-crystal X-ray diffraction.
- Khalaj, Mehdi,Lalegani, Arash,Akbari, Jafar,Ghazanfarpour-Darjani, Majid,Lyczko, Krzysztof,Lipkowski, Janusz
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- Three-dimensional fivefold interpenetrating microporous metal-organic framework based on mixed flexible ligands
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The chiral diamondoidlike Cd(II) containing coordination polymer {[Cd(oba)(bib)]·2H2O}n (1) (oba = 4,4′-oxybis(benzoate), bib = 1,4-bis(2-methyl-imidazol-1-yl)butane) is reported; the 3D networks interpenetrate fivefold, nevertheless
- Huang, Xiao-Ying,Yue, Ke-Fen,Jin, Jun-Cheng,Liu, Jian-Qiang,Wang, Cheng-Jun,Wang, Yao-Yu,Shi, Qi-Zhen
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- Highly efficient and very robust blue-excitable yellow phosphors built on multiple-stranded one-dimensional inorganic-organic hybrid chains
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Inorganic-organic hybrid semiconductors are promising candidates for energy-related applications. Here, we have developed a unique class of multiple-stranded one-dimensional (1D) structures as very robust and efficient lighting phosphors. Following a systematic ligand design strategy, these structures are constructed by forming multiple coordination bonds between adjacent copper iodide inorganic building units CumIm (m = 2, 4, 6) (e.g. dimer, tetramer and hexamer clusters) and strong-binding bidentate organic ligands with low LUMO energies which give rise to infinite 1D chains of high stability and low bandgaps. The significantly enhanced thermal/photostability of these multiple-stranded chain structures is largely attributed to the multi-dentate nature and enhanced Cu-N bonding, and their excellent blue excitability is a result of using benzotriazole based ligands with low-lying LUMO energies. These facts are confirmed by Density Functional Theory (DFT) calculations. The luminescence mechanism of these compounds is studied by temperature dependent photoluminescence experiments. High internal quantum yields (IQYs) are achieved under blue excitation, marking the highest value reported so far for crystalline inorganic-organic hybrid yellow phosphors. Excellent thermal- and photo-stability, coupled with high luminescence efficiency, make this class of materials promising candidates for use as rare-earth element (REE) free phosphors in energy efficient general lighting devices.
- Fang, Yang,Sojdak, Christopher A.,Dey, Gangotri,Teat, Simon J.,Li, Mingxing,Cotlet, Mircea,Zhu, Kun,Liu, Wei,Wang, Lu,O'Carroll, Deirdre M.,Li, Jing
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