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Issue 23, 2013
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Characterization of powellite-based solid solutions by site-selective time resolved laser fluorescence spectroscopy

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Abstract

We present a comprehensive study of the solid solution system Ca2(MoO4)2–NaGd(MoO4)2 on the molecular scale, by means of site-selective time resolved laser fluorescence spectroscopy (TRLFS). Eu3+ is used as a trace fluorescent probe, homogeneously substituting for Gd3+ in the solid solution crystal structure. Site-selective TRLFS of a series of polycrystalline samples covering the whole composition range of the solid solution series from 10% substitution of Ca2+ to the NaGd end-member reveals it to be homogeneous throughout the whole range. The trivalent ions are incorporated into the powellite structure in only one coordination environment, which exhibits a very strong ligand–metal interaction. Polarization-dependent measurements of a single crystal of NaGd(Eu)(MoO4)2 identify the coordination geometry to be of C2v point symmetry. The S4 symmetry of the Ca site within the powellite lattice can be transformed into C2v assuming minor motion in the first coordination sphere.

Graphical abstract: Characterization of powellite-based solid solutions by site-selective time resolved laser fluorescence spectroscopy

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Article information


Submitted
15 Jan 2013
Accepted
04 Apr 2013
First published
04 Apr 2013

This article is Open Access

Dalton Trans., 2013,42, 8387-8393
Article type
Paper

Characterization of powellite-based solid solutions by site-selective time resolved laser fluorescence spectroscopy

M. Schmidt, S. Heck, D. Bosbach, S. Ganschow, C. Walther and T. Stumpf, Dalton Trans., 2013, 42, 8387 DOI: 10.1039/C3DT50146A

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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