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- W2080832862 abstract "Abstract Five cationic transition metal (ethylenediamine) complexes (M=Cr(III), Co(III), Ni(II), and Cu(II)):paramolybdate anion (Mo 7 O 24 6− ) have been synthesis and characterized via their elemental analysis, magnetic susceptibility ( μ eff ), thermal analysis (TG and DTA), FTIR spectra, and X-ray diffraction (XRD). The FTIR study suggests that the compounds prepared be of the ion-pair type ([M(en) n ] m ·Mo 7 O 24 ). Thermal study showed that molybdenum in the Cr(III), and Co(III) compounds is reduced from oxidation state (VI) to (V) at high temperature. The stoichiometries of the resulting mixed oxides at elevated temperatures (500–750°C) are: Cr 2 O 3 ·7MoO 2.5 , Co 2 O 3 ·7MoO 2.5 , 6CoOCl·7MoO 2.5 , 3NiO·7MoO 3 and 3CuO·7MoO 3 . Above 750°C the molybdenum oxide in the ion-pair compounds start the sublimation process. X-ray diffraction of [Cr(en) 3 ]·Mo 7 O 24 , [Co(en) 3 ]·Mo 7 O 24 , and [Cu(en) 2 (H 2 O) 2 ] 3 ·Mo 7 O 24 shows that these complexes are crystalline solids with a similar structure, while the [Ni(en)(H 2 O) 4 ] 3 ·Mo 7 O 24 , and [Co(en)(H 2 O) 2 Cl 2 ] 6 ·Mo 7 O 24 ion-pair compounds display a different structure. A novel technique based on photocatalysis to eliminate Cr(VI) ions, a toxic pollutant in the environment, was applied. The photoreduction of Cr(VI) to Cr(III) ion in aqueous suspensions using new-mixed oxides as photocatalysts (Cr 2 O 3 ·MoO 2.5 , Co 2 O 3 ·MoO 2.5 , NiO·MoO 3 , and CuO·MoO 3 ) under air-equilibration and irradiation by a medium pressure mercury lamp (UV–VIS) was investigated." @default.
- W2080832862 created "2016-06-24" @default.
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- W2080832862 date "2000-12-01" @default.
- W2080832862 modified "2023-10-18" @default.
- W2080832862 title "Structural studies of reaction products between paramolybdate anion and some cationic [metal(II) and (III)-(ethylenediamine)n] complexes utilized as new photocatalysts under UV–VIS light illumination" @default.
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