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. Author manuscript; available in PMC: 2014 Oct 17.
Published in final edited form as: Chem Sci. 2012 Apr;3(4):1105–1110. doi: 10.1039/C2SC00975G

Fig. 5.

Fig. 5

Electronic absorption spectra of 2a–5a (top left), 2b–5b (top middle-left), 2c–5c (top middle-right), and 2d–5d (top right) followed by fluorescence spectra of 2a–5a (bottom left), 2b–5b (bottom middle-left), 2c–5c (bottom middle-right), and 2d–5d (bottom right).