Assignment IBU IBU-CHL IBU-TCNQ IBU-BTB IBU-MO IBU-PA
(d, CH3) δ0.87 δ0.87 δ0.89 δ0.87 δ0.87 δ0.85
(d, 4CH3) - - - δ1.00 - -
(d, CH3) δ1.41 δ1.43 δ1.41 δ1.41 δ1.43 δ1.41
(m, CH) δ1.78 δ1.83 δ1.81 δ1.78 δ1.78 δ1.77
(s, CH3) - - - δ1.97 - -
(s, CH3) - - - δ2.13 - -
(d, CH2) δ2.43 δ2.42 δ2.44 δ2.42 δ2.42 δ2.41
(s, 2CH3) - - - - δ3.09 -
(m, 2CH) - - - δ3.28 - -
(m, CH) δ3.62 δ3.62 δ3.64 δ3.62 δ3.61 δ3.60
(m, arayl) δ7.07 δ7.09 δ7.20 δ6.94-7.51 δ6.81-6.84
δ7.79-7.94
δ7.05-7.19
δ7.38-7.71
(s, COOH) δ11.0 - - - - -
Table 8: 1H NMR spectra.
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