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. Author manuscript; available in PMC: 2010 Mar 31.
Published in final edited form as: J Org Chem. 2009 Sep 4;74(17):6462–6468. doi: 10.1021/jo901298n

FIGURE 4.

FIGURE 4

Partial 1H NMR spectra at 22 °C in CDCl3 showing the macrocycle methylene signals for squaraine rotaxanes; (a) 2d with J = 5.8 Hz in a 300 MHz spectrum; (b) 5 with J1 = 8.2 Hz, J2 = 14.4 Hz (left) and J1 = 1.5 Hz, J2 = 14.4 Hz (right) in a 600 MHz spectrum.