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Sequence of Structural and Magnetic Phase Transitions in (NO)Mn6(NO3)13

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posted on 2024-03-06, 22:19 authored by Anna A. Vorobyova, Igor V. Morozov, Tatyana M. Vasilchikova, Konstantin V. Zakharov, Yevgeny A. Ovchenkov, Gregory D. Chistyakov, Anna G. Ivanova, Larisa V. Shvanskaya, Konstantin A. Lyssenko, Zlata Pchelkina, Alexander N. Vasiliev, Olga S. Volkova
New nitrosonium manganese(II) nitrate, (NO)Mn6(NO3)13, has been synthesized and structurally characterized. In the temperature range of 45–298 K, the crystal is hexagonal (centrosymmetric sp. gr. P63/m). Mn2+ ions are assembled into tubes along axis c with both NO3– filling and coating. The nitrosonium cation is located in the framework cavity and is disordered by a 3-fold axis. At the temperature TS1 = 190 K, a structural phase transition related to the libration of the intertube NO3 group and a small variation of Mn polyhedron is observed. Moreover, the anomalies in physical properties of (NO)Mn6(NO3)13 allow suggesting that ordering of NO+ units occurs at low temperatures. The antiferromagnetic ordering in this compound is preceded by the formation of a short-range correlation regime at about 25 K and takes place in two steps at TN1 = 12.0 K and TN2 = 8.4 K.

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    Inorganic Chemistry

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    magnetic phase transitionstubes along axisrange correlation regimenew nitrosonium manganese2 +s1 n2 n1 13 sup >+3 >< subp nitrosonium cationfold axisc units occurstwo stepstemperature rangetakes placestructurally characterizedsmall variationphysical propertieslow temperaturesframework cavitycentrosymmetric spallow suggesting4 k25 k190 k0 k

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