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The rare earth propylenediphosphonate, REH[O 3 P(CH 2 ) 3 PO 3 ], (RE[diph]), RE=La-Lu, Y included, have been synthesized by hydothermal technique. The crystal structure is monoclinic with C2/m as space group. The RE cation is coordinated by eight oxygen atoms from the phosphonate groups. The absorption spectra of neodymium compound, Nd[diph], are recorded in the spectral...
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