Stereodynamics of trans-((t-Bu) sub 2 PPh) sub 2 MCl sub 2 (M = Pt(II) and Pd(II)) and trans-((t-Bu) sub 2 PPh) sub 2 M(CO)Cl (M = Rh(I) and Ir(I)). Dynamic NMR and X-ray crystallographic studies
- Univ. of Vermont, Burlington (USA)
- Univ. of Delaware, Newark (USA)
Single-crystal X-ray analysis of trans-((t-Bu){sub 2}PPh){sub 2}MCl{sub 2} for which M = Pt(II) or Pd(II) reveals a molecular conformation (C{sub i}) in which both phenyl groups are mutually anti. In both cases, the metal atom lies on a crystallographic inversion center and the overall geometry at the metal template is essentially square planar. The {sup 31}P({sup 1}H) dynamic NMR (DNMR) spectra of both trans-((t-Bu){sub 2}PPh){sub 2}PdCl{sub 2} and trans-((t-Bu){sub 2}PPh){sub 2}PtCl{sub 2} show a decoalescence at low temperature into four singlets (four diastereomeric conformations). One singlet resonance is strongly dominant in both complexes. Two singlets correspond to the two diastereomeric conformations in which the phenyl groups are anti to each other and oriented on the same side or opposite sides of the coordination plane (C{sub i} and C{sub 2} molecular symmetry). The other two singlets are assigned to diastereomeric conformations in which the phenyl groups are mutually syn and on the same side or opposite sides of the coordination plane (C{sub s} and C{sub 2} molecular symmetry).
- OSTI ID:
- 6190420
- Journal Information:
- Journal of Physical Chemistry; (USA), Vol. 94:16; ISSN 0022-3654
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ORGANOMETALLIC COMPOUNDS
STEREOCHEMISTRY
STRUCTURAL CHEMICAL ANALYSIS
CRYSTAL STRUCTURE
EXPERIMENTAL DATA
IRIDIUM COMPOUNDS
MEASURING METHODS
NMR SPECTRA
PALLADIUM
PLATINUM
RHODIUM COMPOUNDS
X-RAY DIFFRACTION
COHERENT SCATTERING
DATA
DIFFRACTION
ELEMENTS
INFORMATION
METALS
NUMERICAL DATA
ORGANIC COMPOUNDS
PLATINUM METALS
REFRACTORY METAL COMPOUNDS
SCATTERING
SPECTRA
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
400201* - Chemical & Physicochemical Properties