Molecular inorganic polymers: synthesis and crystal structures of KCl•2H2SeO3 and CsCl•H2SeO3

KCl center dot 2H(2)SeO(3) and CsCl center dot H2SeO3 have been synthesized using solution evaporation methods from aqueous solution. Both compounds are monoclinic (P2/n and P2(1)/c) and demonstrate new structure types. One symmetrically unique SeO(OH)(2) molecule is present in each structure. SeO(OH)(2) molecules via strong hydrogen bonds form chains in KCl center dot 2H(2)SeO(3) and layers in CsCl center dot H2SeO3. The structures of KCl center dot 2H(2)SeO(3) and CsCl center dot H2SeO3 can be described as consisting of ionic KCl chains and CsC1 layers incorporated into the covalent- and hydrogenbonded H2SeO3 matrix. To the best of our knowledge, the cases when selenious acid acts as a contributor to the molecular building blocks of salt-inclusion structures are not known to date.