Research Article

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

Table 2

The main peaks in the electronic spectrum for ibrutinib calculated by time-dependent density functional theory (B3LYP-6-311G++(d,p)) in methanol using two different solvation methods: polarizable continuum model (PCM) and solvation model based on density (SMD).

Solvation methodWavelength (nm)Oscillator strengthMajor contribution

PCM310.130.566HOMO ⟶ LUMO+2 (97%)
SMD309.280.4881HOMO ⟶ LUMO+2 (96%)
PCM399.030.4641HOMO ⟶ LUMO (98%)
SMD396.260.5765
PCM325.980.0416HOMO⟶ LUMO+1 (99%)
SMD328.610.0338

The two methods showed little difference from each other in computing the electronic transitions.