Explicit solvent modeling of NMR parameters of oximes in water and ionic liquids

Abstract

This work aims to employ the molecular dynamics and the theoretical calculation of NMR to investigate the theoretical and solvent effects on NMR parameters of oximes, in a sequential QM / MM approach. Using GROMACS software, a classic molecular dynamics simulation was performed for the 4-PAM oxime and 3-F-4-PAM using water and BMIM-BF4 as solvents using the OPLS form field. Subsequently calculations of quantum molecular dynamics and NMR were performed to identify the fluorine of 3-F-4-PAM oxime as a spectroscopic probe for the treatment of OP intoxication, using the Gaussian 09 software, with the methodology GIAO using the hybrid functional B3LYP and the basis set 6-31G(d,p). In this line, from our calculations, the use of ionic liquids can provide a reasonable trade-off between cost and accuracy for detection of modeling MRI contrast agents for AChE enzymes inhibited organophosphorus compounds.