Issue 41, 2012
From the journal:

Dalton Transactions

Structure and stability range of a hexanuclear Th(iv)–glycine complex†

Christoph Hennig,*ab   Shinobu Takao,ac   Koichiro Takao,ad   Stephan Weiss,a   Werner Kraus,e   Franziska Emmerlinge  and  Andreas C. Scheinostab  

* Corresponding authors

a Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Bautzner Landstr. 400, D-01314 Dresden, Germany
E-mail: hennig@esrf.fr
Tel: +33 (0) 476 88 2005

b The Rossendorf Beamline at ESRF, BP 220, F-38043 Grenoble, France

c Department of Engineering Science, University of Electro-Communications, Chofu, Tokyo 182-8585, Japan

d Department of Materials and Life Science, Seikei University, 3-3-1, Kichijoji-kitamachi, Musashino-shi, Tokyo 180-8633, Japan

e BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Str. 11, D-12489 Berlin, Germany

Abstract

A hexanuclear Th(IV)–glycine complex was observed by Th L3-edge EXAFS measurements in an aqueous solution. Within the stability range of this complex the positively charged hexanuclear species [Th6(μ3-O)4(μ3-OH)4(H2O)6(Gly)6(HGly)6]6+ was preserved in a crystal with the composition [Th6(μ3-O)4(μ3-OH)4(H2O)6(Gly)6(HGly)6]·(NO3)3(ClO4)3(H2O)3. This complex appears as a result of a competing reaction between hydrolysis and ligation by glycine. At a pH value below the stability range of the hexanuclear complex, crystals with the composition [Th(H2O)3(HGly)3]·(ClO4)4H2O were obtained from the solution. Three water molecules in the thorium coordination sphere indicate that this complex occurs prior to the onset of Th(IV) hydrolysis.

Graphical abstract: Structure and stability range of a hexanuclear Th(iv)–glycine complex

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Article information

DOI
https://doi.org/10.1039/C2DT31367G
Article type
Paper
Submitted
26 Jun 2012
Accepted
31 Aug 2012
First published
03 Sep 2012

Dalton Trans., 2012,41, 12818-12823

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Structure and stability range of a hexanuclear Th(IV)–glycine complex

C. Hennig, S. Takao, K. Takao, S. Weiss, W. Kraus, F. Emmerling and A. C. Scheinost, Dalton Trans., 2012, 41, 12818 DOI: 10.1039/C2DT31367G

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