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Citation: Su Qiang, Lu Yuhwa. STUDY ON THE CRYSTAL GROWTH,COMPOSITION AND SOME PROPERTIES OF DIMETHYLSULPHOXIDE COMPLEXES OF RARE EARTH NITRATES[J]. Chinese Journal of Applied Chemistry, ;1985, 2(1): 1-7. shu

STUDY ON THE CRYSTAL GROWTH,COMPOSITION AND SOME PROPERTIES OF DIMETHYLSULPHOXIDE COMPLEXES OF RARE EARTH NITRATES

Su Qiang ,
Lu Yuhwa

1.
Changchun Institute of Applied Chemistry, Academia Sinica

Received Date: 24 May 1984
Available Online: 16 August 1984

All dimethylsulphoxide complexes of rare earth nitrates (except Pm) were synthesized. Large dimensional crystals of La or Nd (60×28×25mm or 80×28×28mm respectively)were grown. The composition of complexes with fromLa to Gd is RE(NO₃)₃·4DMSO and those with from Tb to Lu (including Y)is RE(NO₃)₃·3DMSO. Because of steric hindrance causing by lanthanide con-traction, the number of the bound DMSO is decreased from 4 to 3 and the coordination number is decreased from 10 to 9. Comparing the absorption spectra of Nd³⁺ ion in aqueous solution with those in DMSO solution,red shift of the spectral bands of Nd³⁺ ion in DM-SO solution has been observed, this implies that in the DMSO solution there exists a certain degree of covalency in the RE-O bond. When the crystals are thermal decomposed in air at 850℃, the composition of the thermal decomposed products of the trivalent rare earth ions becomes RE₂O₂SO₄(RE=Nd³⁺, Eu³⁺,Y³⁺). The magnetic susceptibilities X_g of all dimethylsulphoxide complexes of rare earth nitrates have been determined. As the atomic number (Z) of rare earths increases they change periodically and there appear two maxima in the plot of X_g vs. Z. The absorption, excitation and fluorescence spectra of Pr (NO₃)₃·4DMSO and Tb(NO₃)₃3DMSO were determined.
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