Synthesis, Crystal and Electronic Structure of the New Sulfido Ferrate Cs7[FeS2]2[Fe2S3]2

Synthesis, Crystal and Electronic Structure of the New Sulfido Ferrate Cs7[FeS2]2[Fe2S3]2
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新型硫化铁酸盐Cs7[FeS2]2[Fe2S3]2的合成、晶体及电子结构

DOI:
10.1002/zaac.201500097
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发表时间:
2015
期刊:
Zeitschrift für anorganische und allgemeine Chemie
影响因子:
--
通讯作者:
C. Röhr
C. Röhr
中科院分区:
--
文献类型:
--
作者:
M. Schwarz;C. Röhr

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以Cs2S2、元素铁和硫为原料,在Ar气氛中,在1000℃的条件下,在纯相中合成了具有金属绿色光泽的针状中价硫化高铁酸盐CS7[FeS2]2[Fe2S3]2。单斜晶系[空间群C2/m,a=3083.8(2),b=559.03(3),c=761.57(4)pm,β=95.829(4)°,Z=2,r1=0.0715]代表了一种新的结构类型。它含有两种不同类型的链状阴离子,其中一种是[FeS4]四面体的单链[FeII/IIIS4/2]1.5-,它们通过相反的边连接,类似地在混价链状高铁酸盐(II/III)中作为唯一阴离子存在,例如CS3[Fe2S4]。第二个硫化高铁酸盐离子是由两个融合的单链组成的双链[Fe2S3]2-,与中价矿物凹凸棒石Cs[FeII,III2S3]和高铁酸盐(II)Ba[FeII2S3]的结构中的构筑块类似。校正了两个铯中心的局域无序,分离两个链状高铁酸根离子的Cs离子由7到8个硫原子配位。无论是考虑Fe-S和Fe-Fe距离等几何特征(与相关化合物相比),还是考虑晶格能计算,两种不同链状阴离子中铁的电荷分配是一致的。通过对标题化合物的FP-LAPW自旋极化GGA+能带结构的计算,得到了FePDOS和Bader电荷的进一步支持。
The intermediate‐valent sulfido ferrate Cs7[FeS2]2[Fe2S3]2, which forms needles with metallic greenish lustre, was synthesized in pure phase from Cs2S2, elemental iron and sulfur at a maximum temperature of 1000 °C in an argon atmosphere. The monoclinic structure [space groupC2/m,a= 3083.8(2),b= 559.03(3),c= 761.57(4) pm,β= 95.829(4)°,Z= 2,R1= 0.0715] represents a new structure type. It contains two different type of chain anions running along the monoclinicbdirection, one of them single chains [FeII/IIIS4/2]1.5–of [FeS4] tetrahedra connected by opposite edges, which are similarly found as sole anions in mixed‐valent chain ferrates(II/III) like e.g. Cs3[Fe2S4]. The second sulfido ferrate ion, double chains [FeII2S3]2–of two fused single chains, is comparable to the building blocks in the structure of the intermediate‐valent mineral pautovite, Cs[FeII, III2S3], and the ferrate(II) Ba[FeII2S3]. Corrected for the local disorder of two cesium sites, the Cs cations separating the two chain ferrate ions are coordinated by 7 to 8 sulfur atoms. The assignment of the iron charges in the two different chain anions is consistent, regardless whether geometric features like Fe–S and Fe–Fe distances (as compared with related compounds) or lattice energy calculations are taken into account. It is further supported by the Fe pDOS and the Bader charges obtained from an FP‐LAPW spin‐polarized GGA+Ubandstructure calculation of the title compound.
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