The Cluster Compounds AgW_6Br_(14) and Ag_2W_6Br_(14)

Yue-Qing Zheng; Horst Borrmann; Yuri GrinKarl PetersHans Georg von Schnering

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The Cluster Compounds AgW_6Br_(14) and Ag_2W_6Br_(14)

机译：团簇化合物AgW_6Br_（14）和Ag_2W_6Br_（14）

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The reaction of W_6Br_(12) with AgBr in evacuated silica tubes (temperature gradient 925 K/915K) yielded brownish black octahedra of AgW_6Br_(14) (I) and yellowish green platelets of Ag_2W_6Br_(14) (II) both in the low temperature zone. (I) crystallizes cubically (Pn3 (no. 201); a = 13.355 A, Z = 4) and (II) monoclinically (P2_1/c (no. 14); a = 9.384 A, b = 15.383 A, c = 9.522 A, #beta# = 117.34 deg, Z = 2). Both crystal structures contain isolated cluster anions, namely (W_6Br_8~i)Br_6~a~(1-) and (W_6Br_8~i)Br_6~a~(2-), respectively, with the mean distances and angles: (I) d(W-W) = 2.648 A, d(W-Br~i) = 2.617 A, d(W-Br~a) = 2.575 A, d(Br~i...Br~i) = 3.700 A, d(Br~i...Br~a) = 3.692 A, angleW-Br~i-W = 60.78 deg. (II) d(W-W) = 2.633 A, a(W-Br~i) = 2.624 A, d(W-Br~a) = 3.707, angleW-Br~i-w = 60.23 deg. The Ag~+ cations are trigonal antiprismatically coordinated in (I) with d(Ag-Br) = 2.855 A, but distorted trigonally planar in (II) with d(Ag-Br) = 2.588-2.672 A. The structural detalis of hitherto known compounds with W_6Br_(14) anions will be discussed.

机译：W_6Br_（12）与AgBr在真空二氧化硅管（温度梯度925 K/915K）中反应，在低温区得到棕黑色的Ag[W_6Br_（14）]（I）和黄绿色的Ag_2[W_6Br_（14）]（II）的血红色血小板。（I）立方结晶（Pn3（编号201）;a = 13.355 A，Z = 4）和（II）单临床结晶（P2_1/c（编号14）;a = 9.384 A，b = 15.383 A，c = 9.522 A，#beta# = 117.34 deg，Z = 2）。两种晶体结构均含有孤立的团簇阴离子，分别为[（W_6Br_8~i）Br_6~a]~（1-）和[（W_6Br_8~i）Br_6~a]~（2-），平均距离和角度为：（I） d（W-W） = 2.648 A，d（W-Br~i） = 2.617 A，d（W-Br~a） = 2.575 A，d（Br~i...Br~i） = 3.700 A， d（Br~i...Br~a） = 3.692 A，角度W-Br~i-W = 60.78度（II） d（W-W） = 2.633 A，a（W-Br~i） = 2.624 A，d（W-Br~a） = 3.707，角度W-Br~i-w = 60.23 度。Ag~+阳离子在（I）中是三角形的，d（Ag-Br）=2.855 A，但在（II）中，d（Ag-Br）=2.588-2.672 A时，三角平面扭曲。将讨论迄今为止已知的具有[W_6Br_（14）]阴离子的化合物的结构特征。

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来源
《Zeitschrift fur Anorganische und Allgemeine Chemie》 |1999年第12期|2115-2119|共5页
作者
Yue-Qing Zheng; Horst Borrmann; Yuri GrinKarl PetersHans Georg von Schnering;
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作者单位

Ningbo/P. R. China, Chemistry Department of Ningbo University;

Stuttgart, Max-Planck-Institut fur Festkorperforschung;

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正文语种英语
中图分类化学;
关键词
ternary silver tungsten bromides; AgW_6Br_(14); Ag_2W_6Br_(14); cluster compounds; synthesis; crystal structures;

机译：三元银溴化钨;银[W_6Br_（14）];Ag_2[W_6Br_（14）];团簇化合物;合成;晶体结构;

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1. The Cluster Compounds Ag[W_6Br_(14)] and Ag_2[W_6Br_(14)] [J] . Yue-Qing Zheng, Horst Borrmann, Yuri Grin, Zeitschrift fur Anorganische und Allgemeine Chemie . 1999,第12期

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The Cluster Compounds AgW_6Br_(14) and Ag_2W_6Br_(14)

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