Adsorption Effects of Isoniazid Drug Over Carbon Nanotube (C56H16) and Ab-Initio Molecular Dynamics Simulation (ADMP) – A Computational Quantum Chemical Approach

Tuberculosis (TB) is a deadly disease of global concern. The previous work studies the geometric optimization, vibrational analysis, TDDFT, and electronic properties of the TB pathogen drug isoniazid (ISO). This communication will discuss the changes in geometry, electronic properties, and shielding parameters of ISO-absorbed carbon nanotube (CNT) (CNT-ISO, C₅₆H₁₆). This study has used the DFT/B3LYP/6–311G (d, p) method for the first time to report ISO's electronic structure and interaction parameters on the CNT surface. The same level theory is used to discuss the thermodynamic stability of CNT-ISO. The calculated UV spectra of CNT are compared with UV spectra of CNT-ISO by using the same level theory in a water solvent, which provides a better comprehension of CNT as a drug delivery system after absorption of the ISO in the human body. The nature and strength of interactions have been discussed with the help of NBO and AIM analysis, and the frontier orbital highest occupied molecular orbital–lowest unoccupied molecular orbital (HOMO-LUMO) gap, chemical softness, and chemical hardness have been calculated to understand its complete chemical properties. The characters of the frontier molecular orbitals are discussed and analyzed by comparing the DOS spectra of CNT with CNT-ISO. It has also examined the scan plot of interaction with time using ab-initio dynamics simulation (ADMP) calculations.