Synthesis and crystal structure of the novel platinum-bridged hexaruthenium alkynyl cluster Pt(Ru sub 3 (. mu. -H) l brace. mu. sub 4 -. eta. sup 2 -C triple bond (t-Bu) r brace (CO) sub 9 ) sub 2 : Evidence for the racemization of the chiral metal framework
- The University, Glasgow (Scotland)
The cluster Ru{sub 3}Pt({mu}-H){l brace}{mu}{sub 4}-{eta}{sup 2}-C{triple bond}C(t-Bu){r brace}(CO){sub 9}(COD) decomposes in dichloromethane or toluene solution by elimination of a Pt atom and COD, affording orange crystals of the title complex Pt(Ru{sub 3}({mu}-H){l brace}{mu}{sub 4}-{eta}{sup 2}-C{triple bond}C(t-Bu){r brace}(CO){sub 9}){sub 2} (5) in 40-50% yield. Crystal data for 5: triclinic, space group P{bar 1}; a = 9.546 (2), b = 12.993 (2), c = 17.786 (2) {angstrom}; {alpha} = 72.97 (1), {beta} = 82.48 (1), {gamma} = 74.62 (2){degree}; V = 2030.4 (6) {angstrom}{sup 3}; Z = 2; final R (R{sub w}) values 0.033 (0.038) for 4,806 independent observed (I > 3.0{sigma}(I)) data. Complex 5 contains two Ru{sub 3} cluster units linked by a naked Pt atom, with each cluster unit bonded via one Ru atom and the {alpha}-carbon of the alkynyl ligand. Variable-temperature {sup 13}C NMR spectra show that the chiral metal framework undergoes racemization with an estimated {Delta}G{sup {double dagger}}{sub 266} of 57.1 ({plus minus}1.1) kJ mol{sup {minus}1}.
- OSTI ID:
- 6614738
- Journal Information:
- Organometallics; (USA), Journal Name: Organometallics; (USA) Vol. 9:1; ISSN 0276-7333; ISSN ORGND
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400200* -- Inorganic
Organic
& Physical Chemistry
ALKYNES
COMPLEXES
CRYSTAL STRUCTURE
DATA
DATA ANALYSIS
EXPERIMENTAL DATA
HYDROCARBONS
INFORMATION
MEASURING INSTRUMENTS
MEASURING METHODS
NUMERICAL DATA
ORGANIC COMPOUNDS
PLATINUM COMPOUNDS
RUTHENIUM COMPLEXES
SYNTHESIS
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENT COMPOUNDS
400200* -- Inorganic
Organic
& Physical Chemistry
ALKYNES
COMPLEXES
CRYSTAL STRUCTURE
DATA
DATA ANALYSIS
EXPERIMENTAL DATA
HYDROCARBONS
INFORMATION
MEASURING INSTRUMENTS
MEASURING METHODS
NUMERICAL DATA
ORGANIC COMPOUNDS
PLATINUM COMPOUNDS
RUTHENIUM COMPLEXES
SYNTHESIS
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENT COMPOUNDS