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Applications of 95Mo NMR. 5—substituent effects in the 95Mo and 13C NMR spectra of benzyltricarbonyl(η5-cyclopentadienyl)molybdenum(II) derivatives

✍ Scribed by R. T. C. Brownlee; A. F. Masters; M. J. O'Connor; A. G. Wedd; H. A. Kimlin; J. D. Cotton

Publisher
John Wiley and Sons
Year
1982
Tongue
English
Weight
496 KB
Volume
20
Category
Article
ISSN
0749-1581

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✦ Synopsis

A systematic study has been made of the effects of substituent induced chemical shifts in [($-C,H,)(CO),Mo(CH,Cd€,R)] compounds. Both 9sM0 and "C NMR shifts in the aromatic ring are reported.

The (q'-C5H,)(CO)&loCH2-group is a reasonably strong resonance donor (aR0=-0.21) and weak inductive donor (0,=-0.07). The molybdenum chemical shifts are extremely sensitive to the effects of distant substituents (range c. 40ppm). Since the shift correlates well with substituent constants in this series, it is suggested that the chemical shift is controlled by the paramagnetic term for this spin 5/2 nucleus.

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