On submissionWhen you submit your manuscript to a Royal Society of Chemistry journal, please provide the following. • Article text as a Word, PDF or LaTeX file (if you use LaTeX, please also include a PDF version); submissions to Chemical Communications and Catalysis Science & Technology must use our Communication template, for other journals this is optional • Numbered figures either included within or at the end of the text; for specifications see information below • A cover letter, including a statement of the importance of the work • A list of preferred reviewers; these should be entered in the manuscript submission system • Any electronic supplementary information (ESI) • Any CCDC numbers, as well as CheckCIF files for each crystal structure; see the experimental data section for more informationPlease consult individual journal guidelines for details of any additional required filesThe submission system allows for up to five files to be uploaded at once. Alternatively a ZIP file containing up to 20 files can be uploaded. All files relating to a single manuscript should be uploaded simultaneously during one transaction.