Stress Induced Domain Wall Motion in a Ferroelastic Mn3+ Spin Crossover Complex
Abstract Domain wall motion is detected for the first time during the transition to a ferroelastic and spin state ordered phase of a spin crossover complex. Single crystal X ray diffraction and resonant ultrasound spectroscopy (RUS) revealed two distinct symmetry breaking phase transitions in the mononuclear Mn3+ compound [Mn(3,5 diBr sal2(323)]BPh4, 1. The first at 250 K, involves the space group change Cc Pc and is thermodynamically continuous, while the second, Pc P1 at 85 K, is discontinuous and related to spin crossover and spin state ordering. Stress induced domain wall mobility was interpreted on the basis of a steep increase in acoustic loss immediately below the the Pc P1 transition
Angewandte Chemie