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首页> 外文期刊>RSC Advances >Magnetic, thermal, mesomorphic and thermoelectric properties of mononuclear, dimeric and polymeric iron(II) complexes with conjugated ligands
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Magnetic, thermal, mesomorphic and thermoelectric properties of mononuclear, dimeric and polymeric iron(II) complexes with conjugated ligands

机译：具有共轭配体的单核，二聚和聚合铁（II）配合物的磁，热，介晶和热电性质

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摘要

Three iron(II) complexes with conjugated multidonor ligands (L1 and L2) studied as thermally stable magnetic and thermoelectric materials were [Fe-2(CH3COO)(4)(L1)(2)] (1), [Fe(L1)(3)](BF4)(2)center dot 4H(2)O (2), and {[Fe-2(CH3COO)(4)(L2)]center dot 2H(2)O}(n) (3). These complexes have low optical band gaps (1.9 eV for 1 and 2, and 2.2 eV for 3) and were magnetic with 57% high-spin Fe(II) in 1, 33% in 2, and 100% in 3 at 25 degrees C. Complex 1 melted at 57.2 degrees C and exhibited mesomorphism, while 2 melted at 96.9 degrees C, defining it as an ionic liquid. The thermal stabilities of 1 (T-dec = 199 degrees C) and 3 (T-dec = 191 degrees C) were lower than 2 (T-dec = 248 degrees C). Their Seebeck coefficients, S-e (in mV K-1) were -0.65 for 1, -0.54 for 2, and +0.25 for 3, identifying them as potential thermoelectric materials. Complex 1 formed stable thin films on quartz by the spin coating technique. The films formed at aging time t = 0 (F1) and t = 7 days (F2) were made up of monomers of 1. The optical band gaps of the films (1.39 eV for F1 and 1.57 eV for F2) were lower than 1. The films were free of cracks and have a fairly homogeneous morphology. The films with the best morphology were F1 annealed at 40 degrees C and F2 annealed at 60 degrees C.
机译：三种具有共轭多供体配体（L1和L2）的铁（II）配合物被研究为热稳定的磁性和热电材料，分别为[Fe-2（CH3COO）（4）（L1）（2）]（1），[Fe（L1） （3）]（BF4）（2）中心点4H（2）O（2）和{[Fe-2（CH3COO）（4）（L2）]中心点2H（2）O}（n）（3 ）。这些配合物具有低光学带隙（1和2为1.9 eV，3为2.2 eV），并且在25度时具有57％的高自旋Fe（II），2％的33％和3％的100％的磁性C.配合物1在57.2摄氏度下熔融并表现出同晶型，而配合物2在96.9摄氏度下熔融，将其定义为离子液体。 1（T-dec = 199摄氏度）和3（T-dec = 191摄氏度）的热稳定性低于2（T-dec = 248摄氏度）。它们的塞贝克系数S-e（以mV K-1计）分别为-0.65（1），-0.54（2）和+0.25（3），从而将它们确定为潜在的热电材料。配合物1通过旋涂技术在石英上形成稳定的薄膜。在老化时间t = 0（F1）和t = 7天（F2）时形成的薄膜由1的单体组成。薄膜的光学带隙（F1为1.39 eV，F2为1.57 eV）小于1。膜没有裂纹并且具有相当均匀的形态。将具有最佳形态的薄膜在40摄氏度下进行F1退火，并在60摄氏度下进行F2退火。

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