Quadrupolar N-14 NMR Relaxation from Force-Field and Ab Initio Molecular Dynamics in Different Solvents

Autor(es)

Philips, Adam ^[1] ; Marchenko, Alex ^[1] ; Ducati, Lucas C. ^[2] ; Autschbach, Jochen ^[1]

Afiliação do(s) autor(es)

^[1] SUNY Buffalo, Dept Chem, Buffalo, NY 14260 - USA

^[2] Univ Sao Paulo, Inst Chem, Dept Fundamental Chem, Ave Prof Lineu Prestes 748, BR-05508000 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF CHEMICAL THEORY AND COMPUTATION; v. 15, n. 1, p. 509-519, JAN 2019.
• Citações Web of Science: 1

Resumo

Quadrupolar NMR spin relaxation rates and corresponding line widths were computed for the quadrupolar nucleus N-14 for neat acetonitrile as well as for 1-methyl-1,3-imidazole and 1-methyl-1,3,4-triazole in different solvents. Molecular dynamics (MD) was performed with forces from the Kohn-Sham (KS) theory (ab initio MD) and force-field molecular mechanics (classical MD), followed by KS electric field gradient (EFG) calculations. For acetonitrile the agreement of the N-14 line width with experiment is very good. Relative line widths for the azole nitrogens are improved over simpler approximations used previously in conjunction with single-point calculations at the multiconfigurational self-consistent field level. Overall, the NMR line widths are computed within a factor of 2 of the experimental values, giving access to reasonable estimates both of the dynamic EFG variance in the solvated systems as well as the associated correlation times that determine the relaxation rates. (AU)

• Processo FAPESP: 17/17750-3 - Efeito do Solvente em Parâmetros Espectroscópicos de RMN por Dinâmica Molecular ab initio
• Beneficiário: Lucas Colucci Ducati
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 15/08541-6 - Ressonância magnética nuclear: além da determinação estrutural
• Beneficiário: Claudio Francisco Tormena
• Modalidade de apoio: Auxílio à Pesquisa - Temático