posted on 2024-03-06, 22:19authored byAnna 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.