Silver(II) compounds exhibit powerful oxidizing properties and strong magnetic superexchange. AgSO4 is a rare fluorine-free salt of Ag(II) which found some application in organic chemistry. Here, we report a discovery of a new AgSO4 polymorph (\b{eta}). The distinct nature of the two polytypes of AgSO4 is established using powder x-ray diffraction, vibrational spectroscopy and theoretical calculations. The \b{eta} polymorph crystallizes in the monoclinic system (P21/n) and shows structural similarities with CuSO4. DFT calculations indicate very small differences in the energy of the two polymorphs AgSO4, but the relative stability of the \b{eta} polymorph should increase with temperature. The monoclinic distortion of the orthorhombic CuSO4 prototype originates from an unprecedented strong antiferromagnetic interaction between Ag sites along the unit cell diagonal.
@article{arxiv.2207.10393,
title = {New CuSO4-related high-temperature polymorph of AgIISO4},
author = {Mateusz Domanski and Zoran Mazej and Wojciech Grochala},
journal= {arXiv preprint arXiv:2207.10393},
year = {2022}
}
Comments
7 pages, 3 Tables, 6 Figures, and electronic supplement of 16 pages