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Internuclear exchange of carbonyl groups in Os<sub>3</sub>(CO)<sub>12</sub>: coupling constants J(<sup>187</sup>Os–<sup>13</sup>C) in trinuclear osmium carbonyls
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1981
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Intramolecular RearrangementNuclear PhysicsMagnetic ResonanceMolecular BiologyChemistrySpectra-structure CorrelationInorganic CompoundElectron Paramagnetic ResonanceAveraged ResonanceBiophysicsInorganic ChemistryCoupling Constants JCarbonyl GroupsQuantum ChemistrySolution Nmr SpectroscopyTrinuclear Osmium CarbonylsComplexes 187Os3Natural SciencesCoordination ComplexMain Group ChemistryMedicineNuclear Magnetic Resonance Spectroscopy
The first measurement of nuclear spin-spin coupling constants 1J(187Os–13C) is reported for the complexes 187Os3(CO)12 and [187Os3H(CO)12]+; in the 13C n.m.r. spectrum of 187Os3(CO)12 at 150 °C, the averaged resonance is a 1:3:3:1 quadruplet, J(187Os–13C) 33 ± 1 Hz, which indicates that the intramolecular rearrangement occurs via an internuclear mechanism.