Conformational, NBO, NLO, HOMO-LUMO, NMR, electronic spectral study and molecular docking study of N,N-Dimethyl-3-(10H-phenothiazin-10-yl)-1-propanamine

• IR, Raman spectra, NBO, MEP, HOMO-LUMO are reported.
• The wavenumbers are calculated theoretically using Gaussian09 software.
• The geometrical parameters are in agreement with that of similar derivatives.
• Molecular docking the results suggest that promazine might exhibit inhibitory activity against Plasmodium falciparum.

FT-IR and FT-Raman spectra of N,N-Dimethyl-3-(10H-phenothiazin-10-yl)-1-propanamine were recorded and analyzed. The conformational behaviour is also investigated. The vibrational wave numbers were calculated using density functional quantum chemical calculations. The data obtained from wave number calculations are used to assign vibrational bands obtained experimentally. In the most stable form for N,N-Dimethyl-3-(10H-phenothiazin-10-yl)-1-propanamine, the nitrogen atom of the phenothiazine ring is predicted to adopt an expanded pyramidal configuration with an average CNC angle of 118° while the alkylamine chain points away from the phenothiazine ring. The geometrical parameters are compared with related structures. The stability of the molecule arising from hyper conjugative interaction and charge delocalization has been analyzed using natural bonding orbital analysis. The frontier molecular orbital analysis is used to determine the charge transfer within the molecule. The theoretical NMR spectral analysis, Fukui functions and electronic transition UV–Vis spectral analysis is also reported. The docked title compound forms a stable complex with Plasmodium falciparum and gives a binding affinity value of −6.8 kcal/mol and the results suggest that the compound might exhibit inhibitory activity against Plasmodium falciparum.

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