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Proton Conduction in a Single Crystal of a Phosphonato-Sulfonate-Based Coordination Polymer: Mechanistic Insight.
ChemPhysChem ( IF 2.9 ) Pub Date : 2020-02-24 , DOI: 10.1002/cphc.202000102
Ali Javed 1 , Thorsten Wagner 1 , Stephan Wöhlbrandt 2 , Norbert Stock 2 , Michael Tiemann 1
Affiliation  

The proton conduction properties of a phosphonato‐sulfonate‐based coordination polymer are studied by impedance spectroscopy using a single crystal specimen. Two distinct conduction mechanisms are identified. Water‐mediated conductance along the crystal surface occurs by mass transport, as evidenced by a high activation energy (0.54 eV). In addition, intrinsic conduction by proton ′hopping′ through the interior of the crystal with a low activation energy (0.31 eV) is observed. This latter conduction is anisotropic with respect to the crystal structure and seems to occur through a channel along the c axis of the orthorhombic crystal. Proton conduction is assumed to be mediated by sulfonate groups and non‐coordinating water molecules that are part of the crystal structure.

中文翻译:

膦酸酯磺酸盐基配位聚合物单晶中的质子传导:机理研究。

使用单晶样品通过阻抗谱研究了基于膦酸磺酸盐的配位聚合物的质子传导特性。确定了两种不同的传导机制。沿着晶体表面的水介导的电导是通过质量传输发生的,高活化能(0.54 eV)证明了这一点。此外,还观察到质子“跳跃”通过具有低激活能(0.31 eV)的晶体内部的固有传导。后者的传导相对于晶体结构是各向异性的,并且似乎是通过沿着正交晶体的c轴的通道发生的。质子传导被认为是由作为晶体结构一部分的磺酸根基团和非配位水分子介导的。
更新日期:2020-02-24
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