Spin-crossover in [Fe(3-bpp)(2)][BF4](2) in different solvents - A dramatic stabilisation of the low-spin state in water

The temperature of spin-crossover in [Fe(3-bpp)(2)][BF4](2) (3-bpp = 2,6-di{pyrazol-3-yl}pyridine) tends to increase in associating solvents. In particular, T-1/2 shifts to 60-70 K higher temperature in water compared to organic solvents.