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An organic-inorganic polymer with Dawson-type polyoxometalates as building blocks: synthesis, characterization and crystal structure of [{Pr(DMF)6} {Pr(DMF)7}(P2W18O62)] n

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An organic-inorganic polymer of [Pr(DMF)6Pr(DMF)7(P2W18O62)] n has been synthesized in acetonitrile-water (5 : 2, volume ratio) mixed solvent. Single-crystal X-ray structural analysis indicates that the title compound crystallizes in a monoclinic lattice, P21/C, with a = 1.8574(4), b=2.3907(5), c=2.4222(5) nm, β=99.48(3)°, Z = 4, ∨=10.609(4) nm3, D c =3.501 Mg/m3, F(000)=9972, R1=0.0654 and wR 2= 0.1098. The result of crystal structure analysis reveals that Pr3+(1) complex ion is eight-coordinated with a distorted bicapped trigonal prismatic environment, which is combined with the heteropolyanion by terminal oxygen atom, whereas Pr3+(2) complex ion is also eight-coordinated with a distorted square antiprismatic environment, which is linked to the heteropolyanion by terminal oxygen atom. Adjacent structure units of [Pr(DMF)6Pr(DMF)7(P2W18O62)] are bridged through W-O-Pr1-O-W links to form an unprecedented one-dimensional zigzag linear chain by alternate polyanions and cationic units in the polymer. Thermal analysis reveals that the framework of the title polyanion decomposes at 613.8°C.

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Authors and Affiliations

  1. School of Chemistry and Chemical Engineering, Henan University, 475001, Kaifeng, China

    Jingping Wang, Junwei Zhao, Jingyang Niu, Dongjie Guo & Dongbin Dang

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  1. Jingping Wang
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  2. Junwei Zhao
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  3. Jingyang Niu
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  4. Dongjie Guo
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  5. Dongbin Dang
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Correspondence to Jingyang Niu.

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Wang, J., Zhao, J., Niu, J. et al. An organic-inorganic polymer with Dawson-type polyoxometalates as building blocks: synthesis, characterization and crystal structure of [{Pr(DMF)6} {Pr(DMF)7}(P2W18O62)] n . Sc. China Ser. B-Chem. 46, 583–594 (2003). https://doi.org/10.1360/02yb0173

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