ON THE CRYSTAL-STRUCTURE OF BA8NI6N7, A LOW VALENCY NITRIDONICCOLATE WITH INFINITE HELICAL [NI-N] ZIGZAG CHAINS

被引：36

作者：

GUDAT, A ^{[1
]}

MILIUS, W ^{[1
]}

HAAG, S ^{[1
]}

KNIEP, R ^{[1
]}

RABENAU, A ^{[1
]}

机构：

[1] TH DARMSTADT,EDUARD ZINTL INST,W-6100 DARMSTADT,GERMANY

来源：

JOURNAL OF THE LESS-COMMON METALS | 1991年 / 168卷 / 02期

关键词：

D O I：

10.1016/0022-5088(91)90312-R

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Ba8Ni6N7 was prepared from mixtures (pressed pellets) of BaNiN and Ba3N2 (molar ratio 1:1) at 800-degrees-C under nitrogen. The crystal structure was determined by single-crystal X-ray diffraction (C2/c; a = 948.7(4) pm, b = 1657.8(6) pm, c = 1213.7(7) pm; beta = 107.05(5)-degrees; Z = 4). The rather complex new structure type is generated by distorted nitrogen coordination octahedra (NBa6, NBa4Ni2(cis) and NBa4Ni2(trans) which share common edges as well as common corners. Barium is in a threefold (trig. planar) and a fourfold (distorted tetrahedral) nitrogen environment. Nickel (nearly linear coordination, N-Ni-N angle: 162.4(5)-degrees-176.4(4)-degrees) and nitrogen (distance Ni[2]-N[6]: 175.6(10)-181.0(14) pm) are arranged to form infinite helical [Ni-N] zigzag chains which run parallel to the c* direction.

引用

页码：305 / 312

页数：8

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