title: K2[O(HgSO3)3], a new sulfitomercurate with an [OHg3] core.
abstract: The structure of dipotassium mu(3)-oxido-tris[sulfitomercurate(II)], K(2)[O(HgSO(3))(3)], is characterized by segregation of the K(+) cations and complex [O(HgSO(3))(3)](2-) anions into layers parallel to (010). The anion has m symmetry and is a new example of a mu(3)-oxido-trimercurate complex with a central [OHg(3)] core. This unit adopts the shape of a flat, almost trigonal, pyramid (mean O-Hg = 2.072 A and mean Hg-O-Hg = 110.8 degrees). The two independent Hg-S bonds have nearly the same length (mean Hg-S = 2.335 A). Due to intermolecular O...Hg donor-acceptor interactions greater than 2.65 A, the O-Hg-S fragments are slightly bent. The [KO(9)] coordination polyhedron of the K(+) cation approaches a distorted tricapped trigonal prism with a [6+1+2] coordination.
authors.affiliation: Institute for Chemical Technologies and Analytics, Division of Structural Chemistry, Vienna University of Technology, Getreidemarkt 9/164-SC, A-1060 Vienna, Austria. mweil@mail.zserv.tuwien.ac.at
authors.forename: Matthias
authors.initials: M
authors.lastname: Weil
authors.forename: Stefan
authors.initials: S
authors.lastname: Baumann
authors.forename: Dietrich K
authors.initials: DK
authors.lastname: Breitinger