Low-temperature sup 31 P NMR studies of metal phosphine clusters
- Univ. of Nijmegen (Netherlands)
(Au(PPh{sub 3})(AuPPh{sub 3}){sub 7}){sup 2+}, (Pt(H)(PPh{sub 3})(AuPPh{sub 3}){sub 8}){sup 3+} show sharp {sup 31}P NMR resonances in solutions at room temperature although from the solid-state structure different phosphine sites are expected. This is due to fluxionality, the chemical exchange of different phosphorus sites. This process can be slowed by lowering the temperature, and in this slow-exchange regime the different phosphine sites can be assigned by means of {sup 31}P homonuclear shift correlated spectroscopy methods. The tensor surface harmonics model, which is used for the description of the bonding in this type of clusters, offers a rationale for the trends in the observed magnitude of the coupling constants. Deviation of this model is observed for the toroidal clusters, in which the peripheral interactions are shown to be stronger than in the spheroidal clusters. 21 refs., 10 figs., 1 tab.
- OSTI ID:
- 5564066
- Journal Information:
- Inorganic Chemistry; (United States), Journal Name: Inorganic Chemistry; (United States) Vol. 30:8; ISSN 0020-1669; ISSN INOCA
- Country of Publication:
- United States
- Language:
- English
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400201* -- Chemical & Physicochemical Properties
400202 -- Isotope Effects
Isotope Exchange
& Isotope Separation
COMPLEXES
DATA
EXPERIMENTAL DATA
GOLD COMPLEXES
INFORMATION
ISOTOPES
LIGHT NUCLEI
LOW TEMPERATURE
MATHEMATICAL MODELS
MOLECULAR MODELS
MOLECULAR STRUCTURE
NMR SPECTRA
NUCLEI
NUMERICAL DATA
ODD-EVEN NUCLEI
PHOSPHINES
PHOSPHORUS 31
PHOSPHORUS COMPOUNDS
PHOSPHORUS ISOTOPES
PLATINUM COMPLEXES
SILVER COMPLEXES
SPECTRA
STABLE ISOTOPES
TRANSITION ELEMENT COMPLEXES