IMIT   21220
INSTITUTO DE MODELADO E INNOVACION TECNOLOGICA
Unidad Ejecutora - UE
artículos
Título:
Relativistic effects on the nuclear magnetic resonance shielding of FX (X = F, Cl, Br, I, and At) molecular systems
Autor/es:
SERGIO GÓMEZ; GUSTAVO A. AUCAR
Revista:
JOURNAL OF CHEMICAL PHYSICS
Editorial:
AMER INST PHYSICS
Referencias:
Lugar: New York; Año: 2011 vol. 134 p. 204314 - 204325
ISSN:
0021-9606
Resumen:
We present ab inito full four-component and spin-free calculations of the NMR shielding parameter, σ, in the FX (X = F, Cl, Br, I and At) molecular systems. A different expression that overcomes the traditional non-relativistic (NR) approximation used to calculate the relationship between spinrotation constants and the paramagnetic terms of σ p are given. Large deviations from NR results are obtained for σ(X; X = I and At) and for σ(F; FAt). σp (I; FI) is zero within the NR approach but −447.4 parts per million from our calculations. The electronic origin of relativistic corrections are analyzed. All passive SO contributions are obtained as a difference between full four-component calculations and spin-free ones. Considering relativistic effects on the anisotropy, we obtain a deviation of 10% for I and 25% for At. σ SO (X) is always negative and σ SF (X) is always positive; the passive SO becomes larger than the SF one for X = Br, I, and At. Both σ SO (X) and σ SO ⊥ (X) have a functional dependence such as a Zb X being the exponent 3.5 and 3.65, respectively. The passive SO contribution to the anisotropy has a similar functional dependence with an exponent of 3.60, meaning that its perpendicular component is larger than its corresponding parallel component