Fig. 3

UV–Vis–NIR characterization of [CBPQT ⊂ 1]^4(+•). a UV–Vis–NIR spectra (0.50 mM in MeCN, 1 mm path cuvette) of CBPQT^2(+•) (blue), 1^2(+•) (red), and a 1:1 molar ratio of CBPQT^2(+•) and 1^2(+•) (purple); b Vis/NIR Spectra (MeCN, 2 mm cuvette) on titrating CBPQT^2(+•) into 1^2(•+) (0.10 mM). Initial and final spectra are highlighted in blue and purple, respectively. The inset shows the change in absorption at 910 nm on titration of 1^2(+•) with CBPQT^2(+•). Curve fitting is highlighted in red