Lanthanide(III) complexes with the formula Ln(C2H5NO2)3(H2O)3(ClO4)3 (where Ln ≡ Ho, Dy) were obtained in the form of monocrystals which were isomorphic and crystallized in monoclinic space group Cc with the following cell constants: Ho(C2H5NO2)3(H2O)3(C1O4)3: a = 20.506(3) b = 9.245(1)c = 23.989(4) A ̊ β = 100.28(1)°V = 4474.7(2) A ̊3 Z = 8dc = 2.20 g cm-3 dm = 2.19(2)MR = 742.53 F(0.00) = 2912 Dy(C2H5NO2)3(H2O)3(ClO4)3: a = 20.56(7) b = 9.42(8)c = 24.16(5) A ̊ β = 98.7(5)°Z = 8 dm = 2.19. Results from the X-ray crystal structure determination are given for the Ho3+ complex compound. The coordination polyhedron of a Ho(III) ion comprises seven oxygen atoms from glycine and two from water molecules. Two oxygen bridges fasten the linear polymer running along the b axis. Absorption spectra recorded in the region 5500-40000 cm-1 were measured along the a axis for the Dy3+ complex and the probabilities of f-f transitions were analysed on the basis of the Judd-Ofelt theory. Solid state fluorescence spectra of the Dy3+ ion were recorded at 77 and 300 K. The results are discussed and the Stark levels have been determined. Spectroscopic properties of all the known Dy3+ carboxylates were compared.
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