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metal-organic compounds
The reaction of elemental manganese, antimony and selenium with 1,2-ethanediamine (en) in an aqueous ethaneamine solution under hydrothermal conditions yields orange crystals of 2-aminoethylammonium tris(1,2-ethanediamine)manganese tetraselenoantimonate, enH. Mn(en)3.SbSe4. The structure contains tetrahedral SbSe43-anions, octahedral Mn(en)32+ cations as well as monoprotonated ethanediamine molecules.