Photomagnetic studies on spin-crossover solid solutions containing two different metal complexes, [Fe(1-bpp)2]x[M(terpy)2]1−x[BF4]2 (M = Ru or Co)

Abstract

The photomagnetic properties of two series of spin-crossover solid solutions, [Fe(1-bpp)₂]_x[Ru(terpy)₂]_1−x(BF₄)₂ and [Fe(1-bpp)₂]_x[Co(terpy)₂]_1−x(BF₄)₂ (1-bpp = 2,6-bis[pyrazol-1-yl]pyridine), have been investigated. For all the materials, the evolution of the T(LIESST) value, the high-spin → low-spin relaxation parameters and the LITH loops were thoroughly studied. Interestingly in the Fe : Co series, along the photo-excitation, cobalt ions are concomitantly converted from low-spin to high-spin states with the iron centres, and also fully relax after light excitation.