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Hydrogen-bonded networks of [Fe(bpp)<sub>2</sub>]<sup>2+</sup>spin crossover complexes and dicarboxylate anions: structural and photomagnetic properties
22
Citations
39
References
2016
Year
The paper reports the syntheses, crystal structures, thermal and (photo)magnetic properties of spin crossover salts of formula [Fe(bpp)<sub>2</sub>](C<sub>6</sub>H<sub>8</sub>O<sub>4</sub>)·4H<sub>2</sub>O (1·4H<sub>2</sub>O), [Fe(bpp)<sub>2</sub>](C<sub>8</sub>H<sub>4</sub>O<sub>4</sub>)·2CH<sub>3</sub>OH·H<sub>2</sub>O (2·2MeOH·H<sub>2</sub>O) and [Fe(bpp)<sub>2</sub>](C<sub>8</sub>H<sub>4</sub>O<sub>4</sub>)·5H<sub>2</sub>O (2·5H<sub>2</sub>O) (bpp = 2,6-bis(pyrazol-3yl)pyridine; C<sub>6</sub>H<sub>8</sub>O<sub>4</sub> = adipate dianion; C<sub>8</sub>H<sub>4</sub>O<sub>4</sub> = terephthalate dianion). The salts exhibit an intricate network of hydrogen bonds between low-spin iron(ii) complexes and carboxylate dianions, with solvent molecules sitting in the voids. Desolvation is accompanied by a low-spin (LS) to high-spin (HS) transformation in the materials. The dehydrated phase 2 undergoes a two-step transition with a second step showing thermal hysteresis (T<sub>1/2</sub>↑ = 139 K and T<sub>1/2</sub>↓ = 118 K). 2 displays a quantitative LS to HS photomagnetic conversion, with a T(LIESST) value of 63 K.
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