The structure and properties of enterobactin (ent) and its iron III complex were investigated in these studies by imploring the density functional theory (DFT) method, second-order perturbation theory (CASSCF/CASPT2), second-order Møller-Plesset perturbation (MP2) theory, and various Turbomole functionals to investigate the energetics, excitations, shieldings, and UV-Vis spectra of this strongly binding siderophore, enterobactin. To compare and get a proper understanding, the catecholate analog triscatecholate tri-(aminoethyl)-amine (TRENCAM) was used. Noticeably, the results of the DFT/KT3/pcSeg-1 NMR obtained were in best agreement with the experiment. Both the experimental UV/Vis and computed data for enterobactin were in the UV range and complex in the visible region. This shift was primarily due to the metal effect on the ligand. DFT/CAM-B3LYP gives a better excitation result, whereas CASSPT2 gives a better energetic result than DFT for all structures. Based on the energetic and solvation energies, enterobactin proves to bind strongly to iron III compared to its counterpart, TRENCAM.