Line Plot from Scientific Research

1H NMR spectra (500 MHz, D2O) of a) theVP-A-PVCB[7]2complex (300 K) before addition of CB[8], b), c), d), e) forming a newVP-A-PVCB[7]2CB8]2complex (300 K). Note the gradual disappearance of proton h signal and the upfield shift of signals of protons corresponding to butyl groups (acetone: reference). Excess CB[7] was used to ensure quasi-quantitative binding of 2 CB[7] on the 2 viologens and did not impact CB[8] binding as the additional CB[7] could not interact with the guest side-arms. (: signals corresponding to a small amount of theVP-A-PVCB[8]4complex as shown in (f), is for the proposed hosthost interactions)).

DOI