Issue 5, 2010
From the journal:

CrystEngComm

Helical chain observed under transmission electron microscope: Synthesis and structure refinement of lutetium disilicate Lu2Si2O7†

Chao Wang,ac   Xiaoyang Liu,*a   M. E. Fleet,b   Jixue Li,a   Shouhua Feng,a   Ruren Xua  and  Zhenmin Jinc  

* Corresponding authors

a State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun, P. R. China
E-mail: liuxy@jlu.edu.cn
Fax: +86-431-85168316
Tel: +86-431-85168316

b Department of Earth Sciences, the University of Western Ontario, London, Ontario, Canada
E-mail: mfleett@uwo.ca
Fax: +1-519-6613184
Tel: +1-519-6613198

c State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan, P. R. China
E-mail: wangchao@cug.edu.cn
Fax: +86-27-67885096
Tel: +86-27-67885096

Abstract

Crystals of lutetium disilicate (Lu2Si2O7) have been synthesized at 4 GPa and 1200 °C, using a piston-cylinder type high-pressure apparatus. Systematic single-crystal X-ray structure analysis shows that Lu2Si2O7, type X is enantiomorphic in space groups P41212 (structure 1) and P43212 (structure 2). Unit cell parameters are a = 6.5620(2), c = 11.9535(4) Å (1, space group P41212) and a = 6.5621(9), c = 11.954(2) Å (2, space group P43212), respectively. The crystal structures of the two enantiomers are based on helical chains of Lu cations linked by [Si2O7]6− groups, which are parallel to each other and possess the same chirality, being right-handed for structure 1 and left-handed for structure 2. More interesting is that we have directly observed the helical chain under high-resolution transmission electron microscopy (HRTEM).

Graphical abstract: Helical chain observed under transmission electron microscope: Synthesis and structure refinement of lutetium disilicate Lu2Si2O7

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Article information

DOI
https://doi.org/10.1039/B919658G
Article type
Paper
Submitted
21 Sep 2009
Accepted
15 Dec 2009
First published
14 Jan 2010

CrystEngComm, 2010,12, 1617-1620

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Helical chain observed under transmission electron microscope: Synthesis and structure refinement of lutetium disilicate Lu2Si2O7

C. Wang, X. Liu, M. E. Fleet, J. Li, S. Feng, R. Xu and Z. Jin, CrystEngComm, 2010, 12, 1617 DOI: 10.1039/B919658G

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