Publication Date:
2017-10-10
Description:
The lanthanide(III) chloride oxidotungstates(VI) with the formula Ln3Cl3[WO6] for Ln = La - Nd, Sm - Tb were synthesized by solid-state reactions utilizing the respective lanthanide trichloride, lanthanide sesquioxide (where available), and tungsten trioxide together with lithium chloride as flux. The title compounds crystallize hexagonally in space group P63/m (no. 176, a = 941 - 909, c = 543 - 525 pm, Z = 2). The structures comprise crystallographically unique Ln3+ cations surrounded by six O2- and four Cl- anions (C.N. = 10) forming distorted tetracapped trigonal prisms as well as rather uncommon trigonal prismatic [WO6]6- units whose edges are coordinated by nine Ln3+ cations. Thus, a □(3¦∞){([WO6]Ln□(e¦(9/3)))3+} framework (e = edge-sharing) is created, which contains tube-shaped channels along [001] lined with chloride anions. To elucidate the spectroscopic and magnetic properties of the obtained pure phase samples, single-crystal Raman (for Ln = La - Nd, Sm-Tb), diffuse reflectance (for Ln = La, Pr, Nd, Gd) and luminescence spectroscopy (for bulk Ln3Cl3[WO6] (Ln = La, Eu, Gd, Tb) and Eu3+- or Tb3+-doped derivatives of La3Cl3[WO6] and Gd3Cl3[WO6], respectively) were performed and their temperature-dependent magnetic moments (for Ln = Pr, Nd, Gd) were determined.
Print ISSN:
0044-2313
Electronic ISSN:
1521-3749
Topics:
Chemistry and Pharmacology
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