Effect of High Pressure on Superstucture of a Spin crossover Compound

Our proposal aims to conduct high-pressure x-ray diffraction investigations on single crystals of the orthorhombic polymorph of Fe(PM-Bia)2(NCS)2 (PM-Bia=N-(2'- pyridylmethylene)-4-amino-bi-phenyl) utilizing our advanced diamond anvil cells (DACs) optimized both for synchrotron and neutron single-crystal diffraction and characterized by a wide opening angle of 110°. In this research endeavor, we seek to study the evolution of complex structural changes in the vicinity of the critical pressure point 2.02 GPa with a pressure resolution of 0.1-0.2 GPa. This pressure point is of special significance, as, from our previous investigations, we find that it corresponds to the formation of a superstructure in the compound. The use of our wide-angle DACs maximizes accessibility to reciprocal space, particularly beneficial for exploring low-symmetry structures.