Synthesis of Alkaline-Earth Nitridosilicates

  • Author: Angewandte Chemie International Edition
  • Published Date: 24 May 2017
  • Source / Publisher: Angewandte Chemie International Edition/Wiley-VCH
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
thumbnail image: Synthesis of Alkaline-Earth Nitridosilicates

Highly condensed nitridosilicates are useful as host materials for Eu2+-doped luminophores. Nitridosilicates are usually synthesized in high-temperature reactions that provide ideal conditions for the formation of Si–N networks. However, not all target products are stable under these conditions.


Philipp Bielec and Wolfgang Schnick, Ludwig-Maximilians-Universität, Munich, Germany, have developed a synthetic approach for nitridosilicates whose existence had been predicted but which had not been synthesized so far. The method is based on exchanging the cations of presynthesized nitridosilicates in metal halide melts. As a proof of concept, the team prepared the metastable compounds Mg2Si5N8 and β-Ca2Si5N8 from α-Ca2Si5N8 and Sr2Si5N8. The ion-exchange was investigated in situ by temperature-dependent powder X-ray diffraction, which confirmed the preservation of the covalent Si–N networks.


Cation exchange in nitridosilicates is a fundamentally different synthetic approach to nitridosilicates compared with conventional syntheses. This possibility of modifying nitridosilicates in a post-treatment step significantly increases synthetic control and might open up possibilities for targeted syntheses.


 

Article Views: 1852

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

Bookmark and Share

If you would like to reuse any content, in print or online, from ChemistryViews.org, please contact us first for permission. more


CONNECT:

ChemistryViews.org on Facebook

ChemistryViews.org on Twitter ChemistryViews.org on YouTube ChemistryViews.org on LinkedIn Sign up for our free newsletter


Magazine of Chemistry Europe (16 European Chemical Societies)published by Wiley-VCH