“…The main feature on the ATR‐IR spectra (Figure 1) of the BPs are the NH stretching vibration bands ν NH at 3479 cm −1 for ALN, 3382 cm −1 for APBP, and 3332 cm −1 for IBP and the bands assigned to the phosphonate groups: ν asPO2 , 1100 cm −1 for ALN, 1206 cm −1 for APBP, and 1214 cm −1 for IBP; ν PO2 , 1100 cm −1 for ALN, 1182 cm −1 for APBP, and 1184 cm −1 for IBP; ν asP‐OH , 1016, 973, 953, and 914 cm −1 for ALN, 1061, 1052, 1022, and 925 cm −1 for APBP, and 1059, 1048, 1002, and 915 cm −1 for IBP; ν asPOP , 866 cm −1 for ALN, 868 cm− 1 for APBP, and 878 cm −1 for IBP; ν sP‐OH , 824 cm −1 for ALN, 781 cm −1 for APBP, and 762 cm −1 for IBP 23…”