A series of mixed-anion Fe(NH₂trz)₃(BF₄)_2−x(SiF₆)_x/2 spin crossover complexes is obtained modifying the reaction time but also using an increase amount of tetraethyl orthosilicate as the source for the production and the incorporation of SiF₆²⁻ competing with the BF₄²⁻ anions present in the mother solution. The increase of the SiF₆²⁻ anion inclusion to the detriment of the BF₄⁻ counterpart induces a shift of the temperature transition toward high temperatures leading to interesting bistability properties around room temperature with T_1/2 spanning from 300 K to 325 K. Moreover, the implementation of a solid–liquid post synthetic modification approach from the Fe(NH₂trz)₃(BF₄)₂ parent complex with identical TEOS proportions and under certain experimental conditions lead systematically to the same Fe(NH₂trz)₃(BF₄)_1.2(SiF₆)_0.4 composition. This compound presents an abrupt spin crossover behaviour with a narrow hysteresis loop just above room temperature (320 K), which is stable under thermal cycling and along time with no specific storage conditions. Such crystalline powder sample incorporates homogeneous rod-shaped particles whose formation and physical properties can be followed simultaneously using infra-red spectroscopy, dynamic light scattering (DLS), transmission electronic microscopy (TEM) and optical reflectance. The observation of a stabilized single ca. 800 nm population of mixed-anion particles starting from insoluble various sizes (from nano- to microscale) Fe(NH₂trz)₃(BF₄)₂ particles supports the key role of the solvent (water molecules) on the separation, the reactivity and the reorganization of the 1D iron-triazole chains forming the packing of the structure.

中文翻译：

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一系列混合阴离子 Fe(NH2trz)3(BF4)2−x(SiF6)x/2 配合物的室温自旋交叉特性

通过改变反应时间，同时使用增加量的原硅酸四乙酯作为源，获得了一系列混合阴离子 Fe(NH ₂ trz) ₃ (BF ₄ ) _{2− x} (SiF ₆ ) _{x /2自旋交叉络合物。 SiF 6} ²⁻的产生和掺入与母液中存在的BF ₄ ²⁻阴离子竞争。 SiF ₆ ²⁻阴离子夹杂物的增加会损害 BF ₄ ⁻对应物，从而导致温度向高温转变，从而在室温附近产生有趣的双稳态特性，T _1/2范围从 300 K 到 325 K。此外，在一定的实验条件下，对具有相同 TEOS 比例的 Fe(NH ₂ trz) ₃ (BF ₄ ) ₂母体配合物实施固液后合成改性方法，系统地得到相同的 Fe(NH ₂ trz) ₃ (BF ₄ ) _1.2 (SiF ₆ ) _0.4组成。该化合物在室温 (320 K) 以上时表现出突然的自旋交叉行为，具有狭窄的磁滞回线，在热循环和没有特定存储条件的情况下长时间保持稳定。这种结晶粉末样品包含均匀的棒状颗粒，可以使用红外光谱、动态光散射（DLS）、透射电子显微镜（TEM）和光学反射率同时跟踪其形成和物理性质。稳定的单个约的观察。800 nm 的混合阴离子颗粒群，从不溶性的各种尺寸（从纳米级到微米级）Fe(NH ₂ trz) ₃ (BF ₄ ) ₂颗粒开始支持溶剂（水分子）对分离、反应性的关键作用以及一维铁三唑链的重组形成结构的堆积。