ZAAC – 120 Years and still going strong

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

“…Synthesis: Phase pure Cs 23 Mn 16 O 28 can be prepared via the azide/ nitrate [7,8] route from Mn 2 O 3 (99.9 %, Chempur, Karlsruhe, Germany), CsNO 3 (99.9 %, Acros Organics, Geel, Belgium), and CsN 3 in gram amounts. The azide was synthesized from aqueous HN 3 and Cs 2 CO 3 (99 %, Sigma Aldrich, Munich, Germany).…”

“…The mixture was ground thoroughly in an agate mortar and pressed to pellets (10 5 N), dried in vacuo (10 -3 mbar) at 400 K for 12 h, and placed in an argon atmosphere in a tightly closed steel container with a silver inlay (3-4 cm 3 ). [7,8] In a flow of dried argon the following temperature profile was applied: 298 K Ǟ 533 K (100 K·h -1 ); 533 K Ǟ 653 K (5 K·h -1 ); 653 K Ǟ 773 K (20 K·h -1 ) and subsequent annealing for 30 h at 773 K. The obtained mixture, containing brown powder and metallic cesium was post annealed for crystal growth at 773 K for 500 h, in arc-welded tantalum ampoules. The excess of cesium was distilled-off in vacuo at 373 K. Physical Properties: Magnetic properties were studied with a Quantum Design MPMS7 SQUID Magnetometer.…”

“…[4,5] The distinct role of charge and magnetic stripes formation for the microscopic mechanism of MR has given further boost to the ever strong interest in the physics of low dimensional configurations. [6] Applying the recently developed Azide/Nitrate Route (ANR), [7,8] suited for well controlled synthesis of alkali oxometalates, has enabled to prepare and systematically study quasi one-dimensional polyoxometalates. The approach has proven quite prolific, and a series of respective cuprates ( has been realized, [9][10][11][12][13][14][15][16] revealing unambiguous manifestations of Wigner crystallization, e.g.…”

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

“…1 Յ x Յ 2) [11][12][13][14][15][16] have become available through the azide/ nitrate route of synthesis. [17,18] In order to exclude charge ordering as one of the degrees of freedom we were striving for low dimensional manganates containing manganese in an integral oxidation state, e.g. of 2+.…”

“…This implication has been overcome in singular cases by using closed reaction vessels made of reducing materials or, in a more rational fashion, by applying the azide/nitrate route. [17,18] While some sodium manganates(II), as there are Na 2 MnO 2 , [19] Na 2 Mn 2 O 3 , [20] or Na 6 MnO 4 , [21] have been reported, ternary oxomanganates(II) of the heavier alkali metals are quite rare. Cs 23 Mn 16 O 28 , [22] still contains one Mn 3+ species per formula unit, so Rb 2 Mn 3 O 4 [23] and K 2 Mn 2 O 3 [24] are the only rubidium and potassium oxomanganates(II) known, so far.…”