Interplay of spin conversion and structural phase transformations: Re-entrant phase transitions in the 2-propanol solvate of tris(2picolylamine)iron(II) dichloride

Tornroos KW; Hostettler M; Chernyshov D; Vangdal B; Burgi HB

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Interplay of spin conversion and structural phase transformations: Re-entrant phase transitions in the 2-propanol solvate of tris(2picolylamine)iron(II) dichloride

机译：自旋转化和结构相变的相互作用：三氯化（2甲基吡啶胺）铁（II）的2-丙醇溶剂化物中的凹角相变

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Crystal structures, magnetic and thermodynamic properties of the spin-crossover compound tris(2-picolylamine)iron(II) dichloride (with 2-propanol solvent molecules) have been measured in the temperature range from 15 to 293 K. X-ray diffraction, SQUID, and calorimetric experiments all showed two first-order phase transitions with hysteresis loops, a narrow one at T-1 similar to 196 K and a broad, triangular one covering the range 153 < T-2 < 166 K. Crystal structures were analysed at fourteen temperatures in a cooling cycle and at seven temperatures in a heating cycle. They reveal a complex, temperature-dependent ordering behaviour of both the complex cations and the alcohol molecules. A phenomenological model accounting for spin conversion, solvent ordering and coupling between the two processes describes the observed phase transitions and ordering phenomena reasonably well. Similarities and differences in the behaviour of the corresponding ethanol solvate with the same crystal architecture are discussed. It is concluded that spin-crossover behaviour depends as much on molecular properties as it does on intermolecular interactions, both of the spin active and the spin inactive components.

机译：已在15至293 K的温度范围内测量了自旋交联化合物三（2-甲基吡啶胺）二氯化铁（具有2-丙醇溶剂分子）的晶体结构，磁性和热力学性质。 SQUID和量热实验均显示了两个具有磁滞回线的一阶相变，一个在T-1处的窄相变类似于196 K，一个宽三角形的范围覆盖了153

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《Chemistry: A European journal》 |2006年第24期|共9页
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Tornroos KW; Hostettler M; Chernyshov D; Vangdal B; Burgi HB;
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iron; phase transitions; solvent effects; spin crossover; X-ray diffraction; CROSSOVER COMPLEX; HEAT-CAPACITY; MOSSBAUER; lt; FE(2-PIC)3gt; CL2.ETOH; DIFFRACTION; CRYSTAL; STATE; IRON;

机译：铁;相变;溶剂效应;自旋交叉;X射线衍射;交叉络合物;热容;MOSSBAUER;FE（2-PIC）3 CL2.ETOH;衍射;晶体;态;铁;

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1. Interplay of spin conversion and structural phase transformations: Re-entrant phase transitions in the 2-propanol solvate of tris(2picolylamine)iron(II) dichloride [J] . Tornroos KW, Hostettler M, Chernyshov D, Chemistry: A European journal . 2006,第24期

机译：自旋转化和结构相变的相互作用：三氯化（2甲基吡啶胺）铁（II）的2-丙醇溶剂化物中的凹角相变
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4. Pressure induced re-entrant order-disorder like structural phase transition in spinel ferrite nanoparticles [C] . Shekhar Tyagi, Ajay K. Rathore, Gaurav Sharma, DAE Solid State Physics Symposium . 2019

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7. Interplay between spin conversion and structural phase transformation: unusual spin crossover in an iron(II) complex [O] . K. W. Törnroos, B. Vangdal, D. Chernyshov, 2004

机译：旋转转换和结构相变之间的相互作用：铁（II）复合物中的异常旋转交叉

Interplay of spin conversion and structural phase transformations: Re-entrant phase transitions in the 2-propanol solvate of tris(2picolylamine)iron(II) dichloride

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