*4.11. Synthesis of I4TEPM*·*2dioxane*

In a 2-dram glass vial, **I4TEPM** (10 mg, 0.011 mmol) was suspended in 0.5 mL 1,4-dioxane. After adding a few drops of methylene chloride, the vial was sealed and heated to obtain a clear solution. Colorless/pale-yellow crystals suitable for single-crystal X-ray diffraction were harvested by slow evaporation. ATR-FTIR (cm−1): 2958, 2906, 2851, 2171, 1490, 1448, 1401, 1369, 1288, 1252, 1186, 1113, 1077, 1016, 976, 866, 829, 735.

**Supplementary Materials:** NMR and IR spectra, and crystallographic data are available online at http://www. mdpi.com/2624-8549/2/1/11/s1. The crystallographic data for this paper (CCDC 1971906–1971911) can also be obtained free of charge via www.ccdc.cam.ac.uk/data\_request/cif, or by emailing data\_request@ccdc.cam.ac.uk, or by contacting The Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB2 1EZ, UK; fax: +44 1223 336033.

**Author Contributions:** C.A.G. and C.B.A. conceived and designed the experiments; C.A.G. performed the experiments; A.S.S. and E.W.R. performed the single-crystal X-ray crystallography; C.A.G. and C.B.A. analyzed the data and wrote the paper. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research was funded by the U. S. Army Research Laboratory and the U. S. Army Research Office, gran<sup>t</sup> number W911NF-13-1-0387.

**Acknowledgments:** We are grateful to Victor W. Day at the University of Kansas for collecting some single-crystal X-ray data. He, in turn, acknowledges the NSF-MRI gran<sup>t</sup> CHE-0923449 which was used to purchase an X-ray diffractometer and software used in this study.

**Conflicts of Interest:** The authors declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, or in the decision to publish the results.
