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Tunable microwave absorption of switchable complexes operating near room temperature

机译：可调微波吸收可切换复合物在室温附近工作

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Materials that are able to switch microwave radiation are strongly desired for their potential applications in electronic devices. In this paper, we show the spin-dependant interaction of spin-crossover materials with microwave radiation, namely, the ability of coordination compounds [Fe(NH _(2) trz) _(3) ]Br _(2) and [Fe(NH _(2) trz) _(3) ](NO _(3) ) _(2) that undergo a cooperative spin transition between low-spin and high-spin states to operate as thermoswitchable microwave absorbers. The characteristics of the microwave reflection and transmission of these spin-crossover complexes were investigated at variable temperatures. The evolution of both the transmission and reflection spectra in the 26–37 GHz frequency band within the temperature range of spin crossover showed significant differences in the interaction of microwave radiation with the high-spin and low-spin forms of the compounds. The microwave transmission coefficient shows a notable decrease upon transition to the high-spin state, while the reflection coefficient can be both increased or decreased on the characteristic frequencies during the spin transition. The different microwave absorbing properties of the low-spin and high-spin forms are found to be associated with a notable microwave permittivity change upon spin crossover. The switchable microwave reflection/transmission correlates well with the transition characteristics found in the optical and differential scanning calorimetry measurements. These results widen the spectroscopic range in which spin-crossover materials can be applied and contribute to the creation of a preliminary database of the microwave absorbing properties of spin-crossover complexes.
机译：能够切换微波辐射的材料对于电子设备中的潜在应用，强烈希望。在本文中，我们展示了微波辐射的旋转交叉材料的旋转依赖性相互作用，即配位化合物[Fe（NH _（2）Trz）_（3）] Br _（2）和[Fe （NH _（2）TRZ）_（3）]（无_（3））_（2）经历低旋转和高旋转状态之间的协同自旋过渡，以作为热可行的微波吸收器操作。在可变温度下研究了微波反射和这些旋转交叉络合物的传递的特性。在旋转交叉的温度范围内的26-37GHz频带中的传输和反射光谱的演变在微波辐射与化合物的高旋转和低自旋形式的微波辐射相互作用的显着差异。微波传输系数在转换到高自旋状态时表示显着的减小，而在旋转过渡期间，反射系数可以增加或减小特性频率。发现低旋转和高旋转形式的不同微波吸收性能与旋转交叉时的显着微波介电常数变化有关。可切换的微波反射/透射与光学和差示扫描量热测量测量中的过渡特性良好相关。这些结果扩大了旋转交叉材料的光谱范围，并有助于产生旋转交叉络合物的微波吸收性能的初步数据库。

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