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Issue 48, 2014
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Dimeric complexes of rare-earth substituted Keggin-type silicotungstates: syntheses, crystal structure and solid state properties

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Abstract

A series of rare-earth substituted dimeric complexes of Keggin-type silicotungstates: [{Ln(α-SiW11O39)(H2O)}2(μ-CH3COO)2]12− [Ln = EuIII (Eu-1), GdIII (Gd-2), TbIII (Tb-3), DyIII (Dy-4), HoIII (Ho-5), ErIII (Er-6) and TmIII (Tm-7)] and [Ln(α-SiW11O39)2]13− [Ln = PrIII (Pr-8), NdIII (Nd-9), SmIII (Sm-10)] were synthesized by a single step reaction of Na10[α-SiW9O34]·16H2O with Ln(NO3)3·nH2O in potassium acetate buffer at pH 4.5. All these compounds were structurally characterized by single-crystal X-ray diffraction, and other analytical techniques including FT-IR, ICP-AES, UV/vis, photoluminescence spectroscopy, thermogravimetric analysis, 13C and 1H NMR spectroscopy and vibrating sample magnetometry (VSM). The single-crystal X-ray diffraction and FT-IR studies suggest that the compounds Na4K8[{Ln(α-SiW11O39)(H2O)}2(μ-CH3COO)2xH2O (Ln = Eu − Tm) (Eu-1a–Tm-7a), and K6Na7[Ln(SiW11O39)2xH2O (Ln = Pr, Nd, Sm) (Pr-8a–Sm-10a) are isostructural. The photoluminescence properties of Eu-1a, Tb-3a, Dy-4a and Sm-10a were studied at room temperature. VSM studies of Gd-2a, Tb-3a, Dy-4a, Ho-5a, Er-6a and Tm-7a were carried out at room temperature, and they showed paramagnetic behaviour.

Graphical abstract: Dimeric complexes of rare-earth substituted Keggin-type silicotungstates: syntheses, crystal structure and solid state properties

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Supplementary files

Article information


Submitted
28 Mar 2014
Accepted
23 May 2014
First published
23 May 2014

RSC Adv., 2014,4, 25357-25364
Article type
Paper
Author version available

Dimeric complexes of rare-earth substituted Keggin-type silicotungstates: syntheses, crystal structure and solid state properties

M. K. Saini, R. Gupta, S. Parbhakar, A. Kumar Mishra, R. Mathur and F. Hussain, RSC Adv., 2014, 4, 25357
DOI: 10.1039/C4RA02751E

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