Synthesis, crystal structure and properties of a new complex constructed from coordinated Dy(III) unit and the polyanion [SiMo12O40]4−: [Dy(NMP)4(H2O)3]H[SiMo12O40]·2NMP
The synthesis, X-ray crystal structure, IR, UV and ESR spectra, and thermal properties of the new complex formulated [Dy(NMP)4(H2O)3]H[SiMo12O40]·2NMP (NMP = N-methyl-2-pyrrolidone), are reported. The crystal structure indicates that the coordinated ion combines with [SiMo12O40]4− by an electrostatic force. There are several kinds of hydrogen bonding in the complex and the crystal structure shows that the water molecules in the coordination sphere play a dual role: they coordinate to the rare earth ions on one hand and form strong hydrogen bonds on the other. The complex is strongly photosensitive under irradiation with sunlight, resulting in charge transfer by oxidation of the N-methyl-2-pyrrolidone and reduction of the polyoxometalate. The low-temperature ESR spectra indicate that thermal electron delocalization occurs among the Mo atoms in the complex.
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