Tives showed extra reduction and oxidation peaks. Reduction peak at around -1.20 V corresponds to reversible oneelectron reduction from the radical anion on the nitro group which can be normally recognized in aprotic solvents (Silvester et al., 2006). Since the intensities from the reverse scan currents are decreased the mechanism on the reaction is also EC. Extra oxidation peak at around -1.35 V belongs to reversible one-electron oxidation of imine group. The oxidation peak is invisible for compounds from set 1 which implies that the presence of strong electron withdrawing nitro group enables oxidation in the anion (Fry and Reed, 1969). The intensities of the reverse scan are enhanced by 200 implying the ECE nature in the reaction mechanism. Peak currents have been correlated together with the square root of scan rate (2000 mV s-1 ) plus the linear relationship was obtained which indicated diffusion controlled process on the electrode surface.DFT and Time-Dependent-DFT CalculationsElectronic properties of investigated molecules had been studied using calculated energy of HOMO and LUMO orbitals andHOMO UMO energy gap (Egap ). All vertical excitation energies had been computed making use of B3LYP/6-31G(d,p) optimized ground-state geometries in DMSO. Influence of substituents is estimated by comparing the calculated frontier molecular orbital energies (ELUMO , EHOMO ) and Egap (Table three). Molecular orbital plots and energy levels with the HOMO, the LUMO and HOMOLUMO transitions of investigated compounds in DMSO are depicted in Figure five. The key distinction between compounds from set 1 and nitro-substituted (1,3-selenazol-2-yl)hydrazones derives from the stabilization of LUMO inside the presence of nitro group. Diverse positions of nitro group around the phenyl ring A trigger certain adjustments in frontier molecular orbital energies. Since it is well known, electron acceptor group, for instance nitro group, adjacent for the aromatic ring decreases the electron density on the ring by way of a resonance withdrawing effect. If an acceptor is inside a para or ortho position, particular stabilization might be anticipated through the corresponding resonance forms. The alter inside the position from the nitro group from para to ortho and meta destabilizes both HOMO and LUMO. A comparatively modest enhance in HOMO orbital energies could be negligible. Destabilization of your LUMO by 0.1 eV when nitro substituent modifications position from para to ortho or meta, leads to a rise in the power gap. In all molecules with para and ortho-nitro substituents, the LUMO are mostly situated around the aromatic rings A and OMDM-6 Cannabinoid Receptor hydrazone bridges. Inside the case of molecules containing the nitro group in meta-position, the LUMO are mostly situated around the aromatic rings A with smaller participation of the hydrazone bridges. The HOMO are positioned on selenazole rings, phenyl rings B and hydrazone bridges (Figure five). The presence of electron donating substituents ( e and Me) on the phenyl rings B, destabilize HOMO and reduce the energy gap. 79902-63-9 Cancer Considering that Me group is stronger electron donating group in comparison to e group, selenazole analogs with OMe substituted phenyl rings B have the smallest energy gap.Frontiers in Chemistry | www.frontiersin.orgJuly 2018 | Volume six | ArticleElshaflu et al.Selenazolyl-hydrazones as MAO InhibitorsTABLE 3 | Calculated energies on the HOMO and LUMO orbitals and power gap (in eV) for E-(1,3-selenazol-2-yl)hydrazones in DMSO obtained by TD/DFT process. Compound 1 1-Me 1-OMe two 2-Me 2-OMe three 3-Me 3-OMe four 4-Me ELUMO -1.55 -1.54 -1.53.