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Phase transformations in a double complex salt of the ruthenium nitrosyl anion and tetraamine-palladium cation

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Abstract

Second-order phase transformation in double complex salt (DCS) [Pd(NH3)4][RuNO(NO2)4OH] was examined by DSC, single-crystal diffraction and powder diffraction. All data confirm the reversible “order–disorder” phase transition without an experimentally detected sharp volume change in the temperature range of 343–363 K. At low temperature, the less symmetric triclinic phase (P[1 with combining overline]) is stable, while the monoclinic phase (P2/m) is stable at high temperature. The main difference between crystal structures is the disorder of the ruthenium anion in the monoclinic phase due to the presence of the ruthenium atom in a special position. The additional symmetry plane in the P2/m phase includes ON–Ru–O atoms, resulting in the rotational disorder of NO2 groups. The entropy of transformation determined by differential scanning calorimetry corresponds to order–disorder transformation with a 3-fold increase in microstate number.

Graphical abstract: Phase transformations in a double complex salt of the ruthenium nitrosyl anion and tetraamine-palladium cation

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Article information


Submitted
23 Mar 2020
Accepted
03 May 2020
First published
05 May 2020

CrystEngComm, 2020, Advance Article
Article type
Paper

Phase transformations in a double complex salt of the ruthenium nitrosyl anion and tetraamine-palladium cation

G. A. Kostin, E. Yu. Filatov, D. P. Pischur, N. V. Kuratieva and S. V. Korenev, CrystEngComm, 2020, Advance Article , DOI: 10.1039/D0CE00441C

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