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In this work, the potential of corrosion inhibition of four chloroquine derivatives; N4-(7-Chloroquinolin-8-ol-4-yl)-N1,N1-diethylpentane-1,4 diamine (M2), N4-(7-Chloroquinolin-8-amino-4-yl)-N1,N1-diethylpentane-1,4 diamine (M3) and N4-(5-bromo-7-Chloroquinolin-8-amino-4-yl)-N1,N1-diethylpentane-1,4-diamine (M4) were investigated. Their chemical descriptors which include molecular volume, softness, chemical hardness, electronegativity, fraction (ΔN) and electrophilicity index (ω) dipole moments, surface of the molecule, and electronic parameters which include the EHOMO (the highest occupied molecular orbital of energy); ELUMO (lowest unoccupied molecular orbitals of energy) and energy gap (ELUMO-EHOMO) were calculated using the DFT/B3LYP/6-311 G approach. The results revealed an established correlation between the electronic structures and the quantum parameters of the studied molecules together with their inhibition efficiency toward corrosion process. Also chloroquine derivatives with –NH3 substituent: M3 and M4 were predicted to have enhanced inhibition efficiency.

The oxidation of propane-1,3-diol by potassium permanganate in aqueous solution was investigated at λmax 525 nm. The rate of the reaction was found to increase with increase in [KMnO4] and [Propane-1,3-diol]. The reaction showed first order dependence each in [KMnO4] and [Propane-1,3-diol] and independent in the ionic strength of the solution. The values of 〖∆H〗^#(kJ mol-1), 〖∆S〗^# (kJK-1mol-1) and〖 ∆G〗^#(kJmol-1) were 24.98, -0.22 and 90.50 respectively. Negative entropy of activation revealed an ordered transition state for the reaction. Spectroscopic studies and FTIR analysis revealed the product of the reaction to be 3-hydroxyl-propanal.