Rh NMR studies of organometallic rhodium(I) derivatives

✍ Scribed by R. Bonnaire; D. Davoust; N. Platzer

• Publisher: John Wiley and Sons
• Year: 1984
• Tongue: English
• Weight: 528 KB
• Volume: 22
• Category: Article
• ISSN: 0749-1581
• DOI: 10.1002/mrc.1270220205

✦ Synopsis

Organometallic rhodium(I) derivatives have been studied by '03Rh NMR. The chemical shift range extends from 609 ppm ([Rh.cp.cud]) to 2714.7 ppm ([Rh.fod.cod]). These results are supported by 13C and 31P NMR results, and give information about the bonding in these derivatives. Most of the complexes contain the cycloocta-1,5-diene ligand. For these complexes a Linear correlation is observed between 6Rh and 6C (olefmic carbons) (27 points, R = O.%O). For the phosphine derivatives a Linear correlation is found between 6Rh and 'J(RhP) and, also, between 6Rh and parameters characterizing the basicity of the phosphine ligand.

The correlation of 6Rh with ligand properties has been extended to a wider range of complexes by using the 'influence parameters' defined previously (10 points, R=0.947). The sensitivity of 6Rh to steric factors is also proved. '03Rh NMR STUDIES OF ORGANOMETALLIC RHODIUM(1) DERIVATIVES ~~ ~ ~ ~

Table 1. NMR data for compounds 1-33 (lo3Rh and 13C chemical shifts and coupling constants) No. Compound Y 2 3 (MHz) 6'03Rh (ppm)' s ' % (ppm) 'J(RhC) (Hz) 'J(RhP) (Hz)