Jastrzębska Róża, Poręba Tomasz, Cova Federico, Tchoń Daniel M, Makal Anna
Biological and Chemical Research Centre, Faculty of Chemistry, University of Warsaw, Żwirki i Wigury 101, 02-089 Warszawa, Poland.
Laboratory for Quantum Magnetism, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland.
IUCrJ. 2024 Sep 1;11(Pt 5):737-743. doi: 10.1107/S2052252524007681.
A pressure-induced triclinic-to-monoclinic phase transition has been caught `in the act' over a wider series of high-pressure synchrotron diffraction experiments conducted on a large, photoluminescent organo-gold(I) compound. Here, we describe the mechanism of this single-crystal-to-single-crystal phase transition, the onset of which occurs at ∼0.6 GPa, and we report a high-quality structure of the new monoclinic phase, refined using aspherical atomic scattering factors. Our case illustrates how conducting a fast series of diffraction experiments, enabled by modern equipment at synchrotron facilities, can lead to overestimation of the actual pressure of a phase transition due to slow transformation kinetics.
在对一种大型光致发光有机金（I）化合物进行的一系列更广泛的高压同步加速器衍射实验中，捕捉到了压力诱导的三斜晶系到单斜晶系的相变过程。在此，我们描述了这种单晶到单晶相变的机制，其起始压力约为0.6 GPa，并报告了新单斜晶相的高质量结构，该结构使用非球形原子散射因子进行了精修。我们的案例说明了，由于转变动力学缓慢，利用同步加速器设施的现代设备进行快速系列衍射实验，可能会导致对相变实际压力的高估。
