Effect of High Pressure on Spin Crossover Compounds

We would like to carry out high-pressure x-ray diffraction measurements on single crystals of two Fe(II) spin-crossover complexes: Fe(PM–AzA)2(NCS)2, (PM-aza =N-(2'-pyridylmethylene)-4-(azophenyl) aniline), and on two polymorphs of Fe(PM-Bia)2(NCS)2 (PM-Bia=N-(2'- pyridylmethylene)-4-amino-bi-phenyl) using our newly designed compact diamond anvil cells (DACs) with a wide 110° opening angle. Measurements will be realized up to a pressure of 2.2 GPa with a pressure resolution of 0.1-0.2 GPa. The measurements will provide a detailed picture of changes in the crystal structures from high spin to low spin states in the first compound and allow characterizing the pressure-induced phase transition between the two polymorphs of the latter compound.