The reaction of elemental manganese, antimony and selenium with 1,2-et
hanediamine (en) in an aqueous ethaneamine solution under hydrothermal
conditions yields orange crystals of 2-aminoethylammonium tris(1,2-et
hanediamine)manganese tetraselenoantimonate, enH.Mn(en)(3).SbSe4. The
structure contains tetrahedral SbSe43- anions and octahedral Mn(en)(3)
(2+) cations, as well as monoprotonated ethanediamine molecules.