DFT investigation on the application of pure and doped X12N12 (X = B and Al) fullerene-like nano-cages towards the adsorption of temozolomide

The sensitivity of pure and doped X​​​​​​12 N​​​​​​​​​12 (X = B
and Al) fullerene-like nano-cages (FLNs) toward the anticancer drug
temozolomide (TMZ) is probed herein at DFT/M06-2X-D3/6-311G(d,p)
theoretical level in both gas phase and water. A noticeable affinity of
the FLNs toward TMZ was observed along with the negative gas-phase
adsorption energies -1.37 and -2.09 eV for the most stable configurations
of pure B12N12 and Al12N12 pristines, respectively. Considerable charge
transfer from TMZ to the FLNs was also revealed via NBO analysis and the
Hirshfeld atomic charges, making the dipole moment vector of the molecular
complexes to be oriented from the nano-cages to the TMZ moiety.
Furthermore, a percentage decrease in the HOMO-LUMO energy gap (ΔEg) of
38.09 and 17.72 % was obtained for the B12N12 and Al12N12 nano-cages,
respectively. The percentage change in ΔEg was found to be reduced upon
doping and solvation of the FLNs. Finally, a recovery time in vacuum
ultraviolet light of 1.06 s is found for the complex with pure B12N12,
which in addition to the above-mentioned parameters make this boron
nitride cage the best sensor for TMZ, among the FLNs considered in the
present work.