G-quadruplexes are emerging targets in cancer research and understanding how diagnostic probes bind to DNA G-quadruplexes in solution is critical to the development of new molecular tools. In this study the binding of an enantiopure NIR emitting [Os(TAP)2(dppz)]2+ complex to different G-quadruplex structures formed by human telomer (hTel) and cMYC sequences in solution is reported. The combination of NMR and time-resolved infrared spectroscopic techniques reveals the sensitivity of the emission response to subtle changes in the binding environment of the complex. Similar behaviour is also observed for the related complex [Os(TAP)2(dppp2)]2+ upon quadruplex binding.
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Peterková, K., Stitch, M., Boota, R. Z., Scattergood, P. A., Elliott, P. I. P., Towrie, M., … Quinn, S. J. (2023). G-Quadruplex Binding of an NIR Emitting Osmium Polypyridyl Probe Revealed by Solution NMR and Time-Resolved Infrared Studies. Chemistry - A European Journal, 29(11). https://doi.org/10.1002/chem.202203250