Abstract: | Synthesis and Crystal-Structure of Na2Mn3O7 Single crystals of Na2Mn3O7 have been grown hydrothermally applying high oxygen pressure (p = 2 kbar). The new compound cystallizes triclinic; space group P1 ; a = 6.636(6) Å, b = 6.854(6) Å, c = 7.548(6) Å, α = 105.76(6)°, β = 106.86(6)°, γ = 111.60(6)°; Z = 2. The crystal structure has been solved and refined to R = 7.9% and Rw = 6.2% (diffractometer data, 1044 independent reflexions). The crystal structure consists of Mn3O72? anions with manganese coordinated octahedrally by oxygen. These layered anions are hold together by Na+ ions (coordination numbers 5 and 6). |