Absorption, luminescence and crystal structure studies of dysprosium compound with l-α-Alanine: [Dy( l-α-AlaH)(H 2O) 6]Cl 3

Abstract

The dysprosium compound with l-α-Alamine of the formula [Dy( l-α-AlaH)-(H 2O) 6]Cl 3 was obtained from a water solution in the form of single monoclinic crystals with space group P2 1. Distribution of atoms in the structure of [Dy( l-α-AlaH)(H 2O) 6]Cl 3 is rather close to that of the pseudo P2 1 c group. The other parameters were as follows: a = 8.459(3) A ̊ , b = 15.719(4) A ̊ , c= 11.518(3) A ̊ , β= 102.11(3)°, V = 1497.4 A ̊ 3 , Z = 4, d m = 2.08 g cm −3, d c = 2.07 g cm −3, μ(MoKα) = 5.22 mm −1, λ = 0.71069 Å, F(000) = 900 and T = 299 K. The structure consists of a polymeric chain with oxygen bridges fastening the linear polymer running along the c-axis. The final R factor was 0.026 for 2586 reflections. Each dysprosium ion is coordinated by two carboxylate oxygens and six oxygens from water molecules. The absorption spectrum in the region 5500–40000 cm −1 was recorded along the a-axis and the probabilities of f-f transitions were analysed on the basis of the Judd-Ofelt theory. Solid state fluorescence spectra were recorded at 77 and 300 K and compared with all known dysprosium carboxylates data.