Syntheses of RE(Hsal) 3·2H 2O (RE=Eu, Y; Hsal −=C 7H 5O 3−) by solid-state reactions at room temperature

Abstract

The solid-state reaction technique is a convenient, inexpensive and an effective method of materials in high yield. In this paper, two salicylic complexes of rare earth RE(Hsal) 3·2H 2O (RE=Eu, Y; Hsal −=C 7H 5O 3 −) were successfully synthesized by solid-state reaction between rare earth chloride and sodium salicylate at room temperature. The complexes were characterized by elemental analyses, X-ray powder diffraction, FT-IR and differential thermal analysis and thermogravimetry analysis (TG–DTA). From IR spectra, we can conclude that the rare earth ions are coordinated by the oxygen atom from the COO group, rather than by the oxygen atom from O–H. From the TG–DTA curve, we can also see that the stability of two complexes is better than that of sodium salicylate. The crystal structure of complexes at room temperature was examined using X-ray diffraction (XRD). The crystal structure of two complexes all belongs to the triclinic system and P 2 space group. Unit cell parameters were determined by using trial and error methods as follows: the sample Eu(Hsal) 3·2H 2O with the unit cell parameters a=12.0517 Å, b=15.5029 Å, c=8.7551 Å, α=99.707°, β=101.138°, γ=93.672°, V=1574.083 Å 3. The sample Y(Hsal) 3·2H 2O with the unit cell parameters a=9.6976 Å, b=13.1554 Å, c=7.2355 Å, α=98.895°, β=102.008°, γ=75.903°, V=870.418 Å 3.