Abstract

The longitudinal nuclear spin relaxation times and NOE enhancement factors of 13C nuclei of the compounds named in the title, dissolved in CDCl 3, were measured in two magnetic fields. The results are interpreted in terms of 1H- 13C dipole dipole and 13C chemical shift anisotropy relaxation caused by rotational diffusion. Data on shielding tensors of the 13C nuclei in the terminal metal bonded carbonyl groups are reviewed.

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