Internuclear exchange of carbonyl groups in Os3(CO)12 : coupling constants J(187Os–13C) in trinuclear osmium carbonyls
Abstract
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.