Partial 31P{1H} NMR (a) and 1H NMR (b) spectra of the self-assembly of 6. In both spectra, pairs of coupled doublets are indicated by blue, red, and green lines. Based upon the splitting patterns, symmetry, and the intensities of spectral signals, it can be concluded that one predominant species (isomer A) is formed during self-assembly though small amounts of other isomers are present as well.