Synthesis,Structure, and Properties of a New Calcium(II) Complex of 1,10‐Phenanthroline, 1,2,4,5‐Benzenetetracarboxylic Acid,and a New Precursor to Produce Pure Phase Micro‐crystalline Calcite Particles |
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Authors: | Gang Wu Shou‐Quan Zhang Li Guo |
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Institution: | 1. College of Material and Chemical Engineering, Chu Zhou University, Chu Zhou 239012, P. R. China;2. State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing 210093, P. R. China |
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Abstract: | The self‐assembly of 1, 0‐phenanthroline (phen) and 1,2,4,5‐benzenetetracarboxylic acid(H4btc) with Ca(NO3)2 gives rise to a two‐dimensional network structure coordination polymer, Ca(phen)(btc)0.5(H2O)] ( 1 ), which was characterized by elemental analysis, IR spectroscopy, and single‐crystal X‐ray diffraction. This compound is monoclinic, space group C2/c, with Z = 8 in a unit cell with dimensions a = 21.744(3) Å, b = 10.0151(12) Å, c = 14.7122(17) Å, β = 110.2850(10)°. The structure contains one crystallographic unique CaII atom, one phen coordinated molecule and a half of btc4– anion. The phen molecule acts as a didentate ligand chelating with a CaII atom, whereas the btc4– anion acts as a μ6‐bridge linking six different CaII atoms to form a two‐dimensional network with (4, 4) topological structure. The three dimensional stacking structures are formed by C–H ··· O hydrogen bonding and π–π interaction. The thermal stability and fluorescent properties of 1 were investigated. Calcite particles are produced by calcination of compound 1 at 580 °C. The obtained calcite was characterized by XRD and SEM analyses. |
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Keywords: | Fluorescence Calcium Thermal stability CaCO3 |
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