One-dimensional copper phosphonates containing μ-halide, μ-pyridyl N-oxide and phosphonate bridging ligands |
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Authors: | Yun-Sheng Ma Tian-Wei Wang Yi-Zhi Li Li-Min Zheng |
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Institution: | aState Key Laboratory of Coordination Chemistry, Coordination Chemistry Institute, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, PR China |
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Abstract: | This paper reports the syntheses and characterization of four copper phosphonates with chain structures based on (2-pyridyl-N-oxide)phosphonate, namely, Cu2X2(C5H4NOPO3)2]Cu(H2O)6] · 2H2O X = Cl (1), Br (2)] and CuX(C5H4NOPO3H) · H2O X = Cl (3), Br (4)]. Compounds 1 and 2 are isostructural and show a chain structure where Cu(1) and Cu(2) are triply bridged by halide, oxygen donor of the pyridyl N-oxide and O–P–O group. The Cu(H2O)6]2+ serves as a charge-balancing cation and locate between the chains together with the water molecules. Compounds 3 and 4 are also isostructural. In these cases, one of the three phosphonate oxygen atoms is protonated, thus leading to a neutral chain structure which is very similar to the anionic chains in compounds 1 and 2. Magnetic studies of compounds 1–4 reveal that antiferromagnetic interactions are mediated between the copper ions. |
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Keywords: | Copper (2-Pyridyl-N-oxide)phosphonate Chain structure Magnetic property |
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