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Citation: WANG Jing-Ping, ZHAO Jun-Wei, NIU Jing-Yang. Synthesis, Characterization and Crystal Structure of the Charge Transfer Compound[CH₃NH₂CH₃]₂[CH₃NHCH₃]₄H₄[P₂W₁₈O₆₂]·H₂O with Dawson-type Polyoxometalate Subunit[J]. Chinese Journal of Applied Chemistry, ;2004, 21(4): 383-387. shu

Synthesis, Characterization and Crystal Structure of the Charge Transfer Compound[CH₃NH₂CH₃]₂[CH₃NHCH₃]₄H₄[P₂W₁₈O₆₂]·H₂O with Dawson-type Polyoxometalate Subunit

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

Corresponding author: NIU Jing-Yang,
Received Date: 4 June 2003
Available Online: 21 August 2003
Fund Project: 河南省教育厅基金(20011500024) (20011500024)

The charge transfer compound[CH₃NH₂CH₃]₂[CH₃ NHCH₃]₄H₄[P₂W₁₈O₆₂]·H₂O with polyoxometalate subunit has been synthesized from octadecatungstodiphosphoric acid and dimethylamine in acetonitrile aqueous solution, and characterized by IR, UV spectral techniques. X-ray single crystal structural analysis indicates the title compound crystallizes in the monoclinic space group P2₁/n, with lattice parameters a=2.306 2(5) nm, b=1.383 1(3) nm, c=2.468 8(5) nm, β=113.95(3)°, V=7.197(2)nm³, Z=4, R₁=0.052 3. The title compound consists of two protonated dimethylamine molecules, four dimethylamine molecules, one water molecule, four protons and a heteropolyanion of [P₂W₁₈O₆₂]^6-. The results of IR spectra and X-ray single crystal diffraction reveal that there is comparatively stronger interaction between organic groups and heteropolyanions in the solid state. The curve of TG-DTA elucidates that the process of mass loss of the title compound is carried out in three stages. The study of temperature-changing IR spectra reveals that the framework of the heteropolyanion decomposes at ca. 500℃.
- octadecatungstodiphosphoric acid,
- dimethylamine,
- charge transfer compound,
- crystal structure,
- Dawson structure
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Synthesis, Characterization and Crystal Structure of the Charge Transfer Compound[CH3NH2CH3]2[CH3NHCH3]4H4[P2W18O62]·H2O with Dawson-type Polyoxometalate Subunit

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通讯作者: 陈斌, bchen63@163.com

Synthesis, Characterization and Crystal Structure of the Charge Transfer Compound[CH₃NH₂CH₃]₂[CH₃NHCH₃]₄H₄[P₂W₁₈O₆₂]·H₂O with Dawson-type Polyoxometalate Subunit