Applications of  95 Mo NMR. 5 —substituent effects in the  95 Mo and  13 C NMR spectra of benzyltricarbonyl(η 5 ‐cyclopentadienyl)molybdenum(II) derivatives | Zendy

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

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

Author(s) -

Brownlee R. T. C.,

Masters A. F.,

O'Connor M. J.,

Wedd A. G.,

Kimlin H. A.,

Cotton J. D.

Publication year - 1982

Publication title -

organic magnetic resonance

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.483

H-Index - 72

eISSN - 1097-458X

pISSN - 0030-4921

DOI - 10.1002/mrc.1270200203

Subject(s) - substituent , chemical shift , chemistry , molybdenum , cyclopentadienyl complex , nmr spectra database , resonance (particle physics) , ring (chemistry) , spectral line , carbon 13 , nuclear magnetic resonance spectroscopy , crystallography , medicinal chemistry , stereochemistry , inorganic chemistry , organic chemistry , catalysis , physics , atomic physics , astronomy , quantum mechanics

A systematic study has been made of the effects of substituent induced chemical shifts in [(η 5 ‐C 5 H 5 )(CO) 3 Mo(CH 2 C 6 H 4 R)] compounds. Both 95 Mo and 13 C NMR shifts in the aromatic ring are reported. The (η 5 ‐C 5 H 5 )(CO) 3 MoCH 2 group is a reasonably strong resonance donor (σ R ° = −0.21) and weak inductive donor (σ I = −0.07). The molybdenum chemical shifts are extremely sensitive to the effects of distant substituents (range c. 40 ppm). 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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