1. 31 P Chemical Shifts in Ru(II) Phosphine Complexes. A Computational Study of the Influence of the Coordination Sphere
- Author
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Christophe Raynaud, Odile Eisenstein, Eliott Norbert-Agaisse, Brian R. James, Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC), Department of Chemistry [Vancouver] (UBC Chemistry), University of British Columbia (UBC), Hylleraas Centre for Quantum Molecular Sciences (Hylleraas), Department of Chemistry [Oslo], Faculty of Mathematics and Natural Sciences [Oslo], University of Oslo (UiO)-University of Oslo (UiO)-Faculty of Mathematics and Natural Sciences [Oslo], and University of Oslo (UiO)-University of Oslo (UiO)
- Subjects
Denticity ,Coordination sphere ,010405 organic chemistry ,Chemistry ,Ligand ,Chemical shift ,010402 general chemistry ,01 natural sciences ,0104 chemical sciences ,Inorganic Chemistry ,Bond length ,Chemical species ,Crystallography ,Density functional theory ,[CHIM.COOR]Chemical Sciences/Coordination chemistry ,Physical and Theoretical Chemistry ,Natural bond orbital - Abstract
International audience; NMR chemical shift has been the most versatile marker of chemical structures, by reflecting global and local electronic structures, and is very sensitive to any change within the chemical species. In this work, a set of Ru(II) complexes with the same five ligands and a variable 6 th ligand L (none, H2O, H2S, CH3SH, H2, N2, N2O, NO + , C=CHPh, and CO) is studied, using as the NMR reporter, the phosphorus PA of a coordinated bidentate PAN ligand (PAN = o-diphenylphosphino-N,N'dimethylaniline). The chemical shift of PA in RuCl2(PAN)(PR3)(L) (R = phenyl, p-tolyl or p-FC6H4) was shown to increase as the RuPA bond distance decreases, an observation that was not rationalized. This work, using density functional theory (DFT) calculations, reproduces reasonably well the observed 31 P chemical shifts for these complexes, and the correlation between the shifts and the RuPA bond distance as L varies. An interpretation of this correlation is proposed using a Natural Chemical Shift (NCS) analysis based on the Natural Bonding Orbital (NBO) method. This analysis of the principal components of the chemical shift tensors shows how the s-donating properties of L have a particularly high influence on the phosphine chemical shifts.
- Published
- 2020
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