Results and discussion Molecular and

From the previously reported C–H stretching frequencies [45], the wavenumbers will appear within the range of 3125–3000 cm−1. In this Refametinib study, the experimental νC–H vibrations are observed at 3309, 3221, 3190, 3059, 3021 and 2975 cm−1 which are comparable to the calculated HF and B3LYP vibrational frequencies ( Table 4). The bands observed at 1474–1167 cm−1 and 1023–715 cm−1 are assigned to CH in-plane and out-of-plane bending vibrations of 1-naphthaldehyde, respectively [46].