First principles NMR calculations of phenylphosphinic acid C6H5HPO(OH): assignments, orientation of tensors by local field experiments and effect of molecular motion.
The complete set of NMR parameters for (17)O enriched phenylphosphinic acid C(6)H(5)HP( *)O(*OH) is calculated from first principles by using the Gauge Including Projected Augmented Wave (GIPAW) approach [C.J. Pickard, F. Mauri, All-electron magnetic response with pseudopotentials: NMR chemical shifts, Phys. Rev. B 63 (2001) 245101/1-245101/13]. The analysis goes beyond the successful assignment of the spectra for all nuclei ((1)H, (13)C, (17)O, (31)P), as: (i) the (1)H CSA (chemical shift anisotropy) tensors (magnitude and orientation) have been interpreted in terms of H bonding and internuclear distances. (ii) CSA/dipolar local field correlation experiments have allowed the orientation of the direct P-H bond direction in the (31)P CSA tensor to be determined. Experimental and calculated data were compared. (iii) The overestimation of the calculated (31)P CSA has been explained by local molecular reorientation and confirmed by low temperature static (1)H-->(31)P CP experiments.
Gervais
C
C
Université Pierre et Marie Curie-Paris 6, UMR 7574 Laboratoire de Chimie de la Matière Condensée de Paris, Paris F-75005, France. gervais@ccr.jussieu.fr
Coelho
C
C
Azaïs
T
T
Maquet
J
J
Laurent
G
G
Pourpoint
F
F
Bonhomme
C
C
Florian
P
P
Alonso
B
B
Guerrero
G
G
Mutin
P H
PH
Mauri
F
F
D000465:Algorithms; D016880:Anisotropy; D003198:Computer Simulation; D017886:Durapatite / Q000737:chemistry; D004574:Electromagnetic Fields; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D010103:Oxygen Isotopes; D010721:Phosphinic Acids / Q000737:chemistry*
D010103:Oxygen Isotopes; D010721:Phosphinic Acids; C480970:phenylphosphinic acid; D017886:Durapatite