Synthesis, structure, and properties of LiNb6Cl15

被引：23

作者：

Bajan, B ^{[1
]}

Balzer, G ^{[1
]}

Meyer, HJ ^{[1
]}

机构：

[1] UNIV HANNOVER,INST ANORGAN CHEM,D-3000 HANNOVER,GERMANY

来源：

ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE | 1997年 / 623卷 / 11期

关键词：

lithium niobium chloride; niobium cluster; synthesis; crystal structure; lithium mobility;

D O I：

10.1002/zaac.19976231109

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Black single crystals of LiNb6Cl15 were obtained from reactions of Nb powder, NbCl5 and LiCl in sealed niobium tubes at 850 degrees C. The heavy atom structure of LiNb6Cl15 (<Ia(3)over bar d> (no. 230), Z = 16, a = 2055.5(2) pm at 100 K, R(F) = 0.028, R(F-2) = 0.053) is isotypic with the structure of Ta6Cl15. The [Nb6Cl12](2+) clusters in the structure are threedimensionally interconnected via three additional Cla-a. These bridge all vertices of niobium clusters, consistent with [(Nb6Cl12Cl6/2a-a)-Cl-i](-) (the Nb-Cla-a-Nb angles are 140 degrees). At low temperatures the lithium ions are disordered over one-third of sites (48f), occupying cavities inside of two distorted corner-sharing tetrahedra of chloride. These positions for lithium represent the narrowest sections of infinite channels in the structure built up by chloride. An increased lithium ion mobility is obtained above 170 K by Li-7-NMR measurements.

引用

页码：1723 / 1728

页数：6

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