Research Article

Experimental and Density Functional Theory Characteristics of Ibrutinib, a Bruton’s Kinase Inhibitor Approved for Leukemia Treatment

Table 1

The main experimental and calculated vibrational frequencies (in cm−1) and their assignments and contribution for Iibrutinib molecule based on the density functional theory computations at the B3LYP level of theory and 6-311G++(d,p) basis sets.

Experimental frequency (cm−1)Calculated frequency (cm−1)Assignment[a]

3470.053600.64υNH
3436.953478.42υNH
3296.163139.9υCH
3096.163094.3υCH
2952.62980.81υCH
2936.192937.16υCH
2885.622893.51υCH
1652.41653.85υOC
1639.191601.47υOC
1586.751557.82υNC
1520.881505.44υCC
1483.631470.52βHCN
1455.801457.4056βHCH
1312.541304.65υCC
1275.41269.73υNC
1167.021182.43υOC
1147.171121.32υCC
985.52981.64υCH
859.31859.42υCH, υCC
801.88833.23υCH
725.31745.93υCH
698.37684.82υCC

[a]υ: stretching; ß–: bending.