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Cation dependent charge transport in linear dicarboxylate based isotypical 1D coordination polymers

机译:线性二羧酸基同型一维配位聚合物中阳离子依赖的电荷传输

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Two new mixed-ligand one-dimensional coordination polymers (1D CPs) [Cd(adc)(4-phpy)2(H2O)2], (1) and [Zn(adc)(4-phpy)2(H2O)2], (2) (H2adc = acetylenedicarboxylic acid and 4-phpy = 4-phenylpyridine) have been synthesized and well characterized by elemental analysis, infrared spectroscopy, single crystal X-ray diffraction, powder X-ray diffraction (PXRD) and thermogravimetric analysis (TGA). Both compounds 1 and 2 are isostructural and fabricate 3D supramolecular networks by the combination of hydrogen bonding and C–H?π interactions. Interestingly, these two materials exhibit electrical conductivity and reveal Schottky barrier diode behavior. To shed light on the charge transport mechanism of the compounds, the mobility, transit time, diffusion length and density of states at a quasi Fermi level have been derived. The analysis indicates that compound 1 has higher mobility (9.15 × 10?7 m2 V?1 s?1) and diffusion length (1.116 μm) in comparison to compound 2 (mobility and diffusion length are 5.44 × 10?7 m2 V?1 s?1 and 1.050 μm respectively). Compound 1, with the larger cation and shorter H-bonding distance, shows higher electrical conductivity, which is 2.55 times greater than compound 2.
机译:两种新的混合配体一维配位聚合物(Cd(adc)(4-phpy) 2 (H 2 O) 2 ],(1)和[Zn(adc)(4-phpy) 2 (H 2 O) 2 ],(2)(H 2 adc =乙炔二羧酸和4-phpy = 4-苯基吡啶),并通过元素分析,红外光谱,单晶X射线衍射,粉末X射线衍射(PXRD)进行了很好的表征)和热重分析(TGA)。化合物1和2都是同构结构,并通过氢键和C–H?π相互作用的组合来制造3D超分子网络。有趣的是,这两种材料都具有导电性并显示出肖特基势垒二极管的行为。为了阐明化合物的电荷传输机理,已经推导了准费米能级的迁移率,渡越时间,扩散长度和状态密度。分析表明,化合物1具有更高的迁移率(9.15×10 ?7 m 2 V < sup>?1 s ?1 )和扩散长度(1.116μm),与化合物2相比(迁移率和扩散长度为5.44× 10 ?7 m 2 V ?1 s ?1 和1.050μm)。阳离子较大,氢键距离较短的化合物1的电导率更高,是化合物2的2.55倍。

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