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Internuclear exchange of carbonyl groups in Os 3 (CO) 12 : coupling constants J( 187 Os– 13 C) in trinuclear osmium carbonyls

1981; Royal Society of Chemistry; Issue: 16 Linguagem: Inglês

10.1039/c39810000853

2050-5639

A.A. Koridze, O.A. Kizas, N. M. Astakhova, P. V. Petrovskii, Yuri K. Grishin,

Molecular spectroscopy and chirality

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.