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Hydroflux Synthesis and Characterization of the Non‐Centrosymmetric Oxomanganate(V) KSrMnO 4
Author(s) -
Albrecht Ralf,
Doert Thomas,
Ruck Michael
Publication year - 2020
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.202000065
Subject(s) - orthorhombic crystal system , manganese , crystallography , antiferromagnetism , chemistry , crystal structure , paramagnetism , hydroxide , group (periodic table) , thermal decomposition , strontium , inorganic chemistry , physics , organic chemistry , quantum mechanics , condensed matter physics
Bluish‐green crystals of the oxomanganate(V) KSrMnO 4 were synthesized under hydroflux conditions with KOH at about 200 °C starting from KMnO 4 and Sr(NO 3 ) 2 . The product formation depends on the hydroxide concentration and the strontium‐manganese ratio of the starting materials. By changing these parameters, also other reaction products, such as α ‐SrMnO 3 and Sr 5 [MnO 4 ] 3 OH, are obtained. KSrMnO 4 crystallizes in the non‐centrosymmetric orthorhombic space group P 2 1 2 1 2 1 with a = 743.26(7) pm, b = 575.72(6) pm and c = 987.2(1) pm. The crystal structure consists of isolated [MnO 4 ] 3– tetrahedra surrounded by Sr 2+ and K + cations. The group‐subgroup relation to KBaMnO 4 and to the aristotype α‐K 2 SO 4 are discussed. UV/Vis spectra and magnetic data agree with the oxidation state +V of manganese. KSrMnO 4 is paramagnetic, but orders as an antiferromagnet below 4.6(1) K. Thermal analysis of KSrMnO 4 revealed the decomposition at about 950 °C to α‐SrMnO 3 .
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