Influence of the ultra-slow nucleation and growth dynamics on the room-temperature hysteresis of spin-crossover single crystals

Volodymyr M Hiiuk (1, 2, 3) , Karl Ridier (4) , Il’ya A Gural'Skiy (1, 2) , Alexander A Golub (3) , Igor O Fritsky (1, 2) , Gábor Molnár (4) , William Nicolazzi (4) , Azzedine Bousseksou (4)

1 Department of Chemistry, Taras Shevchenko National University of Kyiv
2 UORSY - UkrOrgSyntez Ltd.
3 UKMA - National University of Kyiv-Mohyla Academy
4 LCC - Laboratoire de chimie de coordination

Nucleation and growth phenomena associated with the thermally-induced spin transition was studied using optical microscopy in single crystals of a cyanoheterometallic coordination polymer [Fe(1,6-naphthyridine)2(Ag(CN)2)2]. Despite the fact that the spin-crossover phenomenon occurs near room temperature (ca. 290–300 K), the experimental results show the existence of significant kinetic effects on the hysteretic behaviour of the spin transition in this compound. Ultra-slow switching rates and phase-boundary propagation velocities were observed (down to 3 nm s−1), several orders of magnitude lower than customary. Our observations indicate that these peculiar spin-crossover properties (slow switching kinetics, scan-rate-dependent transition temperatures) are presumably related to the presence of numerous microstructural defects in the crystals, which is an intrinsic characteristic of this compound.

Mots clés: Spin crossover; Nucleation and growth dynamics; Hysteresis; Defects; Single crystals

Domaines: Chimie de coordination; Polymères

Volodymyr M Hiiuk, Karl Ridier, Il’ya A Gural'Skiy, Alexander A Golub, Igor O Fritsky, et al.. Influence of the ultra-slow nucleation and growth dynamics on the room-temperature hysteresis of spin-crossover single crystals. Chemical Physics Letters, 2021, 770, pp.138442. ⟨10.1016/j.cplett.2021.138442⟩. ⟨hal-03179259⟩