Distorted Te nets in the modulated crystal structures of RETe1.94(1) (RE = La, Pr, Nd).

Distorted Te nets in the modulated crystal structures of RETe1.94(1) (RE = La, Pr, Nd).
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RETe1 94(1) 调制晶体结构中扭曲的 Te 网(RE = La、Pr、Nd)

DOI:
10.1107/s2052520620013797
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发表时间:
2020
期刊:
Acta crystallographica Section B, Structural science, crystal engineering and materials
影响因子:
--
通讯作者:
Th. Doert
Th. Doert
中科院分区:
--
文献类型:
--
作者:
H. Poddig;Th. Doert

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用X射线单晶衍射研究了RETe 1.94(1)(RE = La,Pr,Nd)的二维连续调制晶体结构。这些化合物在四元超空间群P4/n(αβ 1/2)00(−βα 1/2)00(编号85.2.58.2)中结晶,其中q1 = αa*+βB*+1/2c *,q2 = −βa*+αB*+1/2c *,并且共享一个共同的基序,即褶皱[RETe]层和平面[Te]层的交替堆叠。这一基本的结构基序观察到所有报道的化合物具有异常大的各向异性位移参数在平面[Te]层。考虑到调制,从这个完美的正方形平面网络的失真注意到沿着与平面[Te]层中的空位。这种畸变导致形成不同的离散阴离子,如Te 2 −、Te 22 −和Te 32 −,类似于先前报道的REX 2-δ化合物(RE =三价稀土金属,X = S、Se、Te)的结构。在调制[Te]层的Te-Te距离被发现在一个狭窄的范围内相比,在相应的硫化物和硒化物。
The two-dimensionally incommensurately modulated crystal structures of the compounds RETe1.94(1) (RE = La, Pr, Nd) were investigated by single-crystal X-ray diffraction. The compounds crystallize in the tetragonal superspace group P4/n(αβ½)00(−βα½)00 (No. 85.2.58.2) with q1 = αa*+βb*+½c* and q2 = −βa*+αb*+½c* and share a common motif of an alternating stacking of a puckered [RETe] layer and a planar [Te] layer. This basic structural motif is observed for all reported compounds with unusually large anisotropic displacement parameters in the planar [Te] layer. Taking the modulation into account, a distortion from this perfect square planar net is noted along with vacancies in the planar [Te] layer. The distortion leads to the formation of different discrete anions, like Te2−, Te22− and Te32−, similar to previously reported structures for REX2–δ compounds (RE = trivalent rare earth metal, X = S, Se, Te). The Te–Te distances in the modulated [Te] layer are found in a narrow range as compared to those in the corresponding sulfides and selenides.
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期刊: Zeitschrift für anorganische und allgemeine Chemie
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