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Title: 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

Journal Article · · Organometallics; (USA)
DOI:https://doi.org/10.1021/om00115a016· OSTI ID:6614738
 [1]
  1. The University, Glasgow (Scotland)
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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), Vol. 9:1; ISSN 0276-7333
Country of Publication:
United States
Language:
English

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Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
RUTHENIUM COMPLEXES
CRYSTAL STRUCTURE
SYNTHESIS
ALKYNES
DATA ANALYSIS
EXPERIMENTAL DATA
MEASURING INSTRUMENTS
MEASURING METHODS
PLATINUM COMPOUNDS
COMPLEXES
DATA
HYDROCARBONS
INFORMATION
NUMERICAL DATA
ORGANIC COMPOUNDS
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENT COMPOUNDS
400200* - Inorganic
Organic
& Physical Chemistry