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103 Rh NMR Chemical Shifts in Organometallic Complexes: A Combined Experimental and Density Functional Study
Author(s) -
Orian Laura,
Bisello Annalisa,
Santi Saverio,
Ceccon Alberto,
Saielli Giacomo
Publication year - 2004
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200305671
Subject(s) - rhodium , chemical shift , density functional theory , chemistry , relativistic quantum chemistry , computational chemistry , scalar (mathematics) , atomic physics , physics , organic chemistry , catalysis , mathematics , geometry
Experimental 103 Rh NMR chemical shifts of mono‐ and binuclear rhodium( I ) complexes containing s ‐ or as ‐hydroindacenide and indacenediide bridging ligands with different ancillary ligands (1,5‐cyclooctadiene, ethylene, carbonyl) are presented. A protocol, based on density functional theory calculations, was established to determine 103 Rh NMR shielding constants in order to rationalise the effects of electronic and structural variations on the spectroscopic signal, and to gain insight into the efficiency of this computational method when applied to organometallic systems. Scalar and spin–orbit relativistic effects based on the ZORA (zeroth order regular approximation) level have been taken into account and discussed. A good agreement was found for model compounds over a wide range of chemical shifts of rhodium (≈10 000 ppm). This allowed us to discuss the experimental and calculated δ ( 103 Rh) in larger complexes and to relate it to their electronic structure.