Node Distortion Modulation for Anisotropic Thermal Expansions of Two‐dimensional Coordination Polymers
Node Distortion Modulation for Anisotropic Thermal Expansions of Two‐dimensional Coordination Polymers
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DOI：
10.1002/cnma.202100026
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发表时间：
2021-03
期刊：
影响因子：
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通讯作者：
Ryo Ohtani;J. Yanagisawa;Benjamin Le Ouay;M. Ohba
中科院分区：
文献类型：
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作者：
Ryo Ohtani;J. Yanagisawa;Benjamin Le Ouay;M. Ohba
各向异性负热膨胀是固态材料的一个有价值的特性，影响它们的微机械和功能响应。合成了两种柔性二维氰根桥联配位聚合物[Fe（salen）]2[M（CN）4]（M=MnN（FeMnN）和Pt（FePt））.它们的各向异性负热膨胀与[Fe（salen）]+单元中节点畸变的弛豫密切相关。与[Mn（salen）]+类似物的比较表明，由于不同的电子状态，铁（III）周围的键长较短。这些节点结构的变化导致FeMnN和FePt分别比它们的Mn类似物表现出更低和更高程度的各向异性热膨胀行为。
Anisotropic negative thermal expansion is a valuable property of solid‐state materials, influencing their micromechanical and functional response. Two flexible two‐dimensional (2D) cyanide‐bridged coordination polymers (CPs) of type [Fe(salen)]2[M(CN)4] (M=MnN (FeMnN) and Pt (FePt)) were synthesized. Their anisotropic negative thermal expansions was strongly linked to relaxations of node distortions in [Fe(salen)]+units. Comparison with the [Mn(salen)]+analogues indicated shorter bond lengths around iron(III), due to the different electronic states. These changes of node structures resulted inFeMnNandFePtexhibiting lower and higher degrees of anisotropic thermal expansion behavior, respectively, than their Mn analogues.