摘要:
Electronic absorption spectra of isomorphic Gd3+, Tb3+ and Yb3+ acetate crystals with the [Ln(2)(CH3COO)(6)(H2O)(4)] formula were measured in the 800-2700 nm range at room temperature. For comparison purposes crystal spectra of the [Y-2(CH3COO)(6)(H2O)(4)].4H(2)O and Na-3[Yb(dpa)(3)].13H(2)O (dpa = 2,6-pyridinedicarboxylate) were also recorded. IR spectra and a luminescence spectrum of the Tb3+ acetate crystal were taken as well. The analysis of the IR and near-IR (NIR) spectra of the crystals has shown that the f-f transitions in the NIR range can be dominated by overtone vibrations of ligands. (C) 2003 Elsevier B.V. All rights reserved.