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 27 May 2015; Accepted 28 August 2015; Accepted Manuscript published 7 September 2015; Advance Article published 11 September 2015; Version of Record published 24 September 2015