High-pressure crystal phase of 1,2-ethylenediamine

Armand Budzianowski, Anna Olejniczak and Andrzej Katrusiak

Acta Crystallographica Section A
Foundations of Crystallography
Volume 61, (August 2005)
Acta Cryst. (2005). A61, c463


Cover Picture: Unusual Thermal Decomposition of AgIISO4 Yielding AgI2S2O7: Bending Hammond’s Rule (Chem. Eur. J. 38/2011)

Przemysław Jan Malinowski, Mariana Derzsi, Armand Budzianowski, Piotr J. Leszczyński, Bartłomiej Gaweł, Zoran Mazej and Wojciech Grochala

Issue Chemistry – A European Journal Volume 17, , Issue 38, page 10481, Sep 12, 2011 
Chem. Eur. J., 17: 10481. doi: 10.1002/chem.201190185

Cover picture

Neither sulfate nor peroxodisulfate. Thermal decomposition of transition-metal sulfates, such as CuSO4, usually occurs by desulfation (elimination of SO3). In their Communication on page 10524 ff., W. Grochala et al. show that AgIISO4 exhibits an unusual reductive pathway of thermal decomposition, which is connected with low-temperature elimination of O2 and formation of the disulfate of AgI. Although the decomposition pathway renders AgI2S2O7, similar to K2S2O8 (with its peroxo O[BOND]O bridge), the thermodynamics and kinetics of this reaction differ markedly for both compounds.