Citation: Ai-Ling Li, Yan-Ping Ma, Dong Qiu. Formation of six-coordinated silicon in calcium phosphosilicate xerogels assisted by polyols at low temperature and pressure[J]. Chinese Chemical Letters, ;2015, 26(6): 768-772. doi: 10.1016/j.cclet.2015.03.004 shu

Formation of six-coordinated silicon in calcium phosphosilicate xerogels assisted by polyols at low temperature and pressure

1.
Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China

Corresponding author: Ai-Ling Li, Dong Qiu,
Received Date: 3 November 2014
Available Online: 9 February 2015
Fund Project: This work was supported by the State Key Development Program of Basic Research of China (No. 2012CB933200) (No. 2012CB933200)National Natural Science Foundation of China (No. 51173193). (No. 51173193)

Silicon is usually found to be four-coordinated when neighbored with oxygen. Six-coordinated silicon is only seen in samples at very specific composition or made at high temperature/pressure. In this study, we managed to synthesize calciumphosphosilicate xerogels containing six-coordinated silicon with the help of polyols by sol-gel method, without the need of treatment at high temperature or high pressure. Both phosphorus precursors and polyols were found to be essential for the formation of six-coordinated silicon species; in the absence of either species, only normal four-coordinated silicon was observed under otherwise identical conditions. Samples containing six-coordinated silicon sites were found to release silicon species faster than those without six-coordinated silicon sites upon dissolved in water, suggesting that six-coordinated silicon species have higher reactivity toward hydrolysis.
- Phosphosilicate,
- Six-coordinated silicon,
- Polyols,
- MAS-NMR
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