Novel Manganate Cs₂₃Mn₁₆O₂₈ Containing Two Different Types of Quasi One‐Dimensional Polyanions, ¹_∞[MnO₂]_n and Unique ¹_∞[Mn₃O₅]_n

Synthesis, Crystal Structure, and Magnetic Properties of K6Mn4O7 Featuring a Novel Two‐Dimensional Poly‐oxomanganate(II) Anion

“…The title compound constitutes a new oxomanganate(II). Similar to most of such alkali metal manganates reported earlier, the Mn 2+ cations are coordinated by four oxygen atoms forming strongly distorted MnO 4 tetrahedra, with bond lengths d (Mn–O) ranging from 201 to 215 pm, and angles O–Mn–O from 94 to 122° (see Table ). Four of these primary building units aggregate via edge sharing to a tetrameric, cluster‐like building block of composition Mn 4 O 10 exhibiting point group symmetry 1, as a secondary substructure.…”

“…While some sodium manganates(II), as there are Na 2 MnO 2 , Na 2 Mn 2 O 3 , or Na 6 MnO 4 , have been reported, ternary oxomanganates(II) of the heavier alkali metals are quite rare. Cs 23 Mn 16 O 28 , still contains one Mn 3+ species per formula unit, so Rb 2 Mn 3 O 4 and K 2 Mn 2 O 3 are the only rubidium and potassium oxomanganates(II) known, so far.…”

Ca12[Mn19N23] and Ca133[Mn216N260]: Structural Complexity by 2D Intergrowth

“…A comparable behavior is reported for the alkali oxomanganates K 5 Mn 3 O 6 , Rb 8 Mn 5 O 10 , and Cs 23 Mn 16 O 28 . The magnetic susceptibilities of these materials also appear to be considerably reduced by strong magnetic exchange interactions already at ambient temperature.…”