AEuAsS3 (A = Li, K, Rb, and Cs):: New As3+ species from an arsenic-rich polysulfide flux

被引：39

作者：

Bera, Tarun K. ^{[1
]}

Kanatzidis, Mercouri G. ^{[1
]}

机构：

[1] Northwestern Univ, Dept Chem, Evanston, IL 60208 USA

来源：

INORGANIC CHEMISTRY | 2008年 / 47卷 / 16期

关键词：

D O I：

10.1021/ic801017h

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Four europium compounds, LiEuAsS3 (I), KEuAsS3 (IIa), RbEuAsS3 (IIb), and CsEuAsS3 (IIc), containing As3+ were synthesized in molten alkali-metal polysulfide salts. An As-rich flux was found to be necessary to stabilize the pyramidal building unit [AsS3](3-). All crystallize in the monoclinic space group P2(1)/c with two new structure types. Compound I features a new coordination mode for the [AsS3](3-) unit and three-dimensional [Eu(AsS3)](-) framework. Compounds IIa-c are isostructural and feature a layer of [Eu(AsS3)](-) with an unusual mu(5)-sulfide anion in a umbrella-like geometry. The compounds are paramagnetic semiconductors with an energy gap of similar to 2.0 eV.

引用

页码：7068 / 7070

页数：3

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