Wang, Yuzhong
Chen, Mingwei
Xie, Yaoming
Wei, Pingrong
Schaefer, Henry F. III
Schleyer, Paul von R.
Robinson, Gregory H.
Article History
Received: 25 November 2014
Accepted: 13 March 2015
First Online: 20 April 2015
Change Date: 23 April 2015
Change Type: Erratum
Change Details: In the version of this Article originally published online, the first sentence of the final paragraph of 'Results and discussion' should have referred to 'room temperature'. This has now been corrected in all versions of the Article.
Competing interests
: The authors declare no competing financial interests.