inorganic compounds
The title compound, dimercury [bis(trioxoselenate(2-)]monohydrate, Hg2(SeO3)2.H2O, contains two inequivalent HgII ions with coordination numbers of five and seven. The coordination polyhedra of these ions are a tetragonal pyramid and a monocapped trigonal prism respectively. One of the two inequivalent selenite groups bridges three HgII ions and the other bridges four HgII ions, thus forming a structure extending in three dimensions.