Synthesis and structure of new microporous Nd(III) silicates of the rhodesite group
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Rui F. Munhá
und
João Rocha
Abstract
The synthesis and structural characterization of two novel trivalent neodymium microporous silicates whose structures are reminiscent of the structure of mineral montregianite of the rhodesite group, and their infrared light-emission properties are reported. The compound KNa2Nd[Si8O19]·5H2O (1) crystallizes in the orthorhombic Pmma space group: a = 23.9016(17) Å, b = 6.9980(5) Å, c = 6.5474(5) Å. Heating 1 at 200 °C for 40 min affords a new partially dehydrated phase, KNa2Nd[Si8O19]·2.8H2O (2), also crystallizing in the orthorhombic Pmma space group: a = 23.923(4) Å, b = 6.9950(11) Å, c = 6.5474(10) Å. Compound 2 is the hydrated phase with the lowest content of water molecule reported to date in the rhodesite mineral series.
Acknowledgments
We would like to thank Fundação para a Ciência e a Tecnologia (FCT, Portugal), the European Union, QREN, FEDER and COMPETE. This work was developed in the scope of the project CICECO-Aveiro Institute of Materials (Ref. FCT UID/CTM/50011/2013), financed by national funds through the FCT/MEC and when applicable co-financed by FEDER under the PT2020 Partnership Agreement. DA and RM acknowledge FCT for post-doc grants SFRH/BPD/95032/2013 and SFRH/BPD/8852/2012. We further wish to thank the two anonymous reviewers of the manuscript for their suggestions and comments.
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Supplemental Material:
The online version of this article (DOI: 10.1515/zkri-2014-1811) offers supplementary material, available to authorized users.
©2015 by De Gruyter
Artikel in diesem Heft
- Frontmatter
- Graphical Synopsis
- Preface
- Special Issue: Zeolites
- Original Articles
- The importance of T⋯T⋯T angles in the feasibility of zeolites
- On the relationship between unit cells and channel systems in high silica zeolites with the “butterfly” projection
- A DFT-D study of the interaction of methane, carbon monoxide, and nitrogen with cation-exchanged SAPO-34
- Structure and bonding of water molecules in zeolite hosts: Benchmarking plane-wave DFT against crystal structure data
- A microporous potassium vanadyl phosphate analogue of mahnertite: hydrothermal synthesis and crystal structure
- Crystal chemical models for the cancrinite-sodalite supergroup: the structure of a new 18-layer phase
- Synthesis and structure of new microporous Nd(III) silicates of the rhodesite group
- Structures of dehydrated microporous copper silicate CuSH-6Na, an in situ single crystal X-ray study
Artikel in diesem Heft
- Frontmatter
- Graphical Synopsis
- Preface
- Special Issue: Zeolites
- Original Articles
- The importance of T⋯T⋯T angles in the feasibility of zeolites
- On the relationship between unit cells and channel systems in high silica zeolites with the “butterfly” projection
- A DFT-D study of the interaction of methane, carbon monoxide, and nitrogen with cation-exchanged SAPO-34
- Structure and bonding of water molecules in zeolite hosts: Benchmarking plane-wave DFT against crystal structure data
- A microporous potassium vanadyl phosphate analogue of mahnertite: hydrothermal synthesis and crystal structure
- Crystal chemical models for the cancrinite-sodalite supergroup: the structure of a new 18-layer phase
- Synthesis and structure of new microporous Nd(III) silicates of the rhodesite group
- Structures of dehydrated microporous copper silicate CuSH-6Na, an in situ single crystal X-ray study
