The molecular structure of MnI2 has been determined by gas-phase electron d
iffraction. The analysis confirmed the linearity of the equilibrium configu
ration of the monomer with a bond length (r(g)) of 2.538 +/- 0.008 Angstrom
. The presence of about 7% dimer was also indicated. The experimental data
were consistent with the usual dimer model with two halogen bridges but the
y were insufficient to determine the dimer structure unambiguously.