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AuPb2I7: A Narrow Bandgap Au3+ Iodide Semiconductor
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2018-01-02 00:00:00 , DOI: 10.1021/acs.inorgchem.7b02723
Grant C. B. Alexander 1 , Douglas H. Fabini , Ram Seshadri , Mercouri G. Kanatzidis 1
Affiliation  

The unusual Au3+ ternary halide AuPb2I7 has been isolated from reactions of AuI, PbI2, and I2. AuPb2I7 crystallizes in the triclinic P1̅ space group as micron-scale needles with cell dimensions a = 4.5170(3) Å, b = 7.3847(4) Å, c = 12.2970(7) Å, α = 76.374(4)°, β = 83.711(4)°, γ = 72.987(3)° at room temperature with ρ = 6.538 g/cm3 and has no structural phase transition down to 100 K. The title compound has a unique three-dimensional structure composed of [Pb2I7]3– pseudolayers extending in [010] bridged by square planar Au3+ at an oblique angle in the [001] direction. The pseudolayers are composed of 1/[Pb2I2]2+ chains propagating down [100] linked by square planar I ions through [010]. AuPb2I7 has a bandgap of 1.17 eV and is stable in air for several days, before degrading to PbI2, Au0, and I2. Density functional theory calculations show that AuPb2I7 is an indirect bandgap semiconductor where the bandgap stems predominantly from Au–I metal–ligand charge transfer.

中文翻译:

AuPb 2 I 7:窄带隙Au 3+碘化物半导体

不寻常的Au 3+三元卤化物AuPb 27已经从AUI,PBI的反应中分离2和I 2。AuPb 27个结晶的三斜晶系中P 1空间群,与单元尺寸的微米级的针= 4.5170(3)埃,b = 7.3847(4),C ^ = 12.2970(7)α= 76.374(4) °,β= 83.711(4)°,γ= 72.987(3)°,在室温下,ρ= 6.538 g / cm 3,低至100 K时无结构相变。标题化合物具有独特的三维结构, [Pb 2 I 7 ]的3–在[010]中延伸的伪层由正方形平面Au 3+在[001]方向上以斜角桥接。伪层由1 / [Pb 2 I 2 ] 2+链组成,这些链向下传播[100],并由方形平面I 离子通过[010]链接。AuPb 2 I 7的带隙为1.17 eV,并且在空气中稳定几天后才降解为PbI 2,Au 0和I 2。密度泛函理论计算表明,AuPb 2 I 7 是一种间接带隙半导体,其中带隙主要来源于Au-I金属-配体的电荷转移。
更新日期:2018-01-02
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