Synthesis and Spectral Study of New Complexes of Eu3+, Am3+, and Cm3+ with GaMo6O18(OH)

Complexing of Am(III) with GaMo₆O₁₈(OH) ₆ ³⁻ polyanion in an aqueous solution was studied. The stability constant β of the resulting complex was estimated at 100–150 l mol⁻¹ at pH 4.0. Crystalline complexes of Eu(III) and Gd(III) [doped with 0.5–1.5% Cm(III) ion] with GaMo₆O₁₈(OH) ₆ ³⁻ polyanion were synthesized from H₂O and D₂O solutions. The luminescence spectra and lifetime were measured for the compounds at T = 295 and 77 K. The luminescence characteristics of the Eu(III) complex proved to be virtually identical to those of the previously synthesized compound EuAlMo₆O₁₈(OH)₆·xH₂O. This also concerns the luminescence of Cm³⁺-doped GdGaMo₆O₁₈(OH)₆·xH₂O complex. The results suggest identical structures of the new compounds and complexes of lanthanides with the AlMo₆O₁₈(OH) ₆ ³⁻ anion. __________ Translated from Radiokhimiya, Vol. 47, No. 6, 2005, pp. 507–511. Original Russian Text Copyright ? 2005 by Yusov, Fedoseev.