Stable selenium diiodide complexes 2 are obtained by the reaction of t
he 2-selenoxoimidazolines 1 with iodine. An X-ray structure analysis o
f 2c reveals its monomeric nature. In the trigonal bipyramid, the iodo
substituents are situated in axial positions forming elongated iodine
bonds [Se-I(1) 2.854(1), Se-I(2) 2.768(1) angstrom; I(1)-Se-I(2) 175.
4(0)degrees].