Document is current

CROSSCHECK

: This document is CrossCheck deposited

COPYRIGHT AND LICENSING

: The Royal Society of Chemistry has an exclusive publication licence for this journal

OPEN ACCESS: This article is freely available. This article is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported Licence (CC BY-NC 3.0)

PUBLICATION HISTORY

: Received 23 September 2016; Accepted 21 November 2016; Accepted Manuscript published 21 November 2016; Advance Article published 2 December 2016; Version of Record published 4 January 2017