Magnetic Bistability in Macrocycle-Based FeII Spin-Crossover Complexes: Counter Ion and Solvent Effects

Cooperative Triazole Based Spin Crossover FeII Coordination Polymers

Narsimhulu Pittala1, Smail Triki1, Franck Thétiot1, Kamel Boukheddaden2, Guillaume Chastanet3, Mathieu Marchivie3 1Department Of Chemistry, UMR CNRS 6521, Université De Bretagne Occidentale (UBO), Brest, France, 2Groupe d\'étude de la matière condensée (GEMaC), Université de Versailles Saint-Quentin, Versailles, France, 3CNRS, Université Bordeaux, ICMCB, UPR 9048, Bordeaux, France E-mail: narsi...

Magnetic fluorescent bifunctional spin-crossover complexes.

The rational design of magnetic and fluorescent bifunctional materials is attracting increasing interest. In this study, two mononuclear Fe(ii) complexes, namely [Fe(L)2(NCS)2] (1) and [Fe(L)2(NCSe)2] (2) are synthesised by combining a spin-crossover unit and a fluorescent ligand (naphth-1-yl)-N-(3,5-di(pyridin-2-yl)-4H-1,2,4-triazol-4-yl)methanimine (L) to achieve bifunctionality. Single-cryst...

Solvent-Induced Polymorphism of Iron(II) Spin Crossover Complexes

Two new mononuclear iron(II) compounds (1) and (2) of the general formula [Fe(L)₂](BF₄)₂·nCH₃CN (L = 4-(2-bromoethyn-1-yl)-2,6-bis(pyrazol-1-yl)pyridine, n = 1 for (1) and n = 2 for compound (2)), were synthesized. The room temperature crystallization afforded concomitant formation of two different solvent analogues: compound (1) exhibiting triclinic P-1 and compound (2) monoclinic C2/c symmetr...

Crystalline-state reaction with allosteric effect in spin-crossover, interpenetrated networks with magnetic and optical bistability.

Spin-crossover and high-spin iron(ii) complexes as chemical shift 19F magnetic resonance thermometers.

The potential utility of paramagnetic transition metal complexes as chemical shift 19F magnetic resonance (MR) thermometers is demonstrated. Further, spin-crossover FeII complexes are shown to provide much higher temperature sensitivity than do the high-spin analogues, owing to the variation of spin state with temperature in the former complexes. This approach is illustrated through a series of...