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. Author manuscript; available in PMC: 2018 Nov 13.
Published in final edited form as: Angew Chem Int Ed Engl. 2017 Oct 17;56(46):14384–14388. doi: 10.1002/anie.201707872

Figure 1.

Figure 1

Left: X-ray crystal structure of 2. Right: UV-Absorption spectra of 1 (black) and 2 (gray) in CH2Cl2 at −90 °C. The inset shows the expansion of the 500 – 900 nm region.