This article describes the best corrosion inhibition behavior and adsorption of newly synthesized amino tetrazole using electrochemical and computational methods.

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Several phosphoric triamides with formula C 6) and P(O)(NH-CH 2 -C 6 H 5 ) 3 (7) were synthesized and characterized by 1 H, 13 C, 31 P NMR and IR spectroscopy and elemental analysis. The structures were determined for compounds 3, 7 and 36, 4-F-C 6 H 4 C(O)NHP(O)(NH-CH 2 -CH¼CH 2 ) 2 . In compound 3, there are intermolecular -P¼O . . . H-N-and -C¼O . . . H-N-hydrogen bonds which form a onedimensional polymeric chain. Compound 7 contains intermolecular -P¼O . . . H-N-hydrogen bonds leading to a one-dimensional polymeric chain. Compound 36 forms intermolecular -P¼O . . . H-N-, -C¼O . . . H-N-and -C-F .. . H-N-hydrogen bonds which produce a threedimensional polymeric chain in the crystalline network. The effects of rotation, ring inversion, temperature and solvent on the coupling patterns of the CH 2 protons in 1 H NMR spectra were discussed. The Gibbs free energy for the rotation around the P-N bond in compounds 3, 6 and 41, (4-CH 3 -C 6 H 4 -O)P(O)Cl[N(CH 3 )(CH 2 C 6 H 5 )], were calculated from dynamic 1 H NMR spectra at low temperatures. The DG # value for compound 3 is the greatest one among these molecules. The crystal structures of compounds 3 and 6 indicates that the slightly smaller P-N amine bond lengths in 3 relative to 6 cause a greater DG # value in 3.