PGSE diffusion, 1H-19F HOESY and NMR studies on several [Rh(1,5-COD)(Biphemp)]X complexes: detecting positional anion effects

Three new salts of Rh(I), [Rh(1,5‐COD)(Biphemp)]X, Biphemp = (6,6′‐dimethylbiphenyl‐2,2′‐diyl)bis(diphenylphosphine), X = BF4−, 2a, PF6−, 2b, and CF3SO3−, 2c, were prepared and studied using PGSE diffusion, 1H–19F HOESY and inverse 103Rh (amongst other) NMR methods. Although the immediate coordinati...

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Bibliographic Details
Published in:Magnetic resonance in chemistry 2004-09, Vol.42 (9), p.795-800
Main Authors: Anil Kumar, P. G., Pregosin, Paul S., Schmid, Thomas M., Consiglio, Giambattista
Format: Article
Language:English
Subjects:
103Rh NMR
1H-19F HOESY
anion effects
Anions
Diffusion
Fluorine
Magnetic Resonance Spectroscopy - methods
Models, Molecular
Molecular Conformation
NMR
PGSE diffusion
Phosphines - analysis
Phosphines - chemistry
Protons
Rhodium - analysis
Rhodium - chemistry
Structure-Activity Relationship
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Summary:Three new salts of Rh(I), [Rh(1,5‐COD)(Biphemp)]X, Biphemp = (6,6′‐dimethylbiphenyl‐2,2′‐diyl)bis(diphenylphosphine), X = BF4−, 2a, PF6−, 2b, and CF3SO3−, 2c, were prepared and studied using PGSE diffusion, 1H–19F HOESY and inverse 103Rh (amongst other) NMR methods. Although the immediate coordination sphere of the cation does not sense the change in the anion, the PGSE diffusion and 1H–19F HOESY data suggest that, in addition to some ion pairing, each of the anions in 2 demonstrates selectivity in its approach towards the cation. Copyright © 2004 John Wiley & Sons, Ltd.
ISSN:0749-1581
1097-458X
DOI:10.1002/mrc.1406