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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >The Molecular Clusters [Bi10Au2](EBi3X9)(2) (E = As, Bi; X = Cl, Br) -Synthesis, Crystal Structures, Twinning and Chemical Bonding
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The Molecular Clusters [Bi10Au2](EBi3X9)(2) (E = As, Bi; X = Cl, Br) -Synthesis, Crystal Structures, Twinning and Chemical Bonding

机译:分子簇[Bi10Au2](EBi3X9)(2)(E = As,Bi; X = Cl,Br)-合成,晶体结构,孪生和化学键合

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摘要

Cooling stochiometric mixtures of molten Bi, BiX3, (X = Cl. Br). E (E = As. Bi). and Au yields black crystals of the low-valent. molecular compounds [Bi10Au2](EB(3)iX(9))(2). The molecules consist of an icosahedral [Bi10Au2](6+) cluster enclosed by two (EB(3)iX(9))(-) hemi-spheres connected via Au-E bonds. The discrepancy of the symmetries of the heteroicosahedron (D-5d) and the caps (C-3v) gives rise 10 pseudomerohedral twinning. As a consequence of the superposition of three monoclinic unit cells (space group P2(1)/c: e.g. a = 1059.02(5) pm, b = 1528.60(5) pm, c = 1463.55(6) pm, beta = 93.69(1)degrees for E Bi, X = Br), the diffraction patterns of the crystals simulate trigonal R-centered cells with lattice parameters of a approximate to 3000 pm and c approximate to 1700 pm. The construction of the molecules can be rationalized in terms of an uncommon combination of known and new structural motives: The Wade cluster [Bi-10](4+) is cluster by two Au+ atoms forming the hetero-icosa-hedron [Bi10Au2](6+). In the anionic caps ((EBi3X9)-Bi-0-X-II)(3-), the Bi-II atoms are in square planar coordination of four halogenide anions and are furthermore bonded to the E atom on the central axis of the molecule. Since the interaction between E and Au can be classified as a donor-acceptor bond, the [Au-I((ER3)-R-0)](2-) fragment with R = (BiX2/1X2/2)-X-II is a complex analog to cations [Au-I((ER3)-R-0)](+) with E = P. As. Sb and R = alkyl or aryl.
机译:冷却的Bi,BiX3(X = Cl。Br)的化学计量混合物。 E(E = As。Bi)。 Au产生低价的黑色晶体。分子化合物[Bi10Au2](EB(3)iX(9))(2)。该分子由被两个通过Au-E键连接的(EB(3)iX(9))(-)半球包围的二十面体[Bi10Au2](6+)簇组成。杂二十面体(D-5d)和帽盖(C-3v)的对称性差异产生了10个伪面体孪晶。由于三个单斜晶胞(空间组P2(1)/ c:例如a = 1059.02(5)pm,b = 1528.60(5)pm,c = 1463.55(6)pm,beta = 93.69( 1)对于E Bi的度数,X = Br),晶体的衍射图模拟晶格参数约为3000 pm和c约为1700 pm的三角R中心晶胞。可以根据已知和新的结构动机的罕见组合合理化分子的结构:Wade簇[Bi-10](4+)由两个形成杂二十碳六面体[Bi10Au2]的Au +原子簇( 6岁以上)。在阴离子帽((EBi3X9)-Bi-0-X-II)(3-)中,Bi-II原子处于四个卤化物阴离子的正方形平面配位状态,并进一步与E原子键合。分子。由于E和Au之间的相互作用可以归类为供体-受体键,因此[Au-I((ER3)-R-0)](2-)片段的R =(BiX2 / 1X2 / 2)-X- II是阳离子[Au-I((ER3)-R-0)](+)的复杂类似物,其中E =P。 Sb和R =烷基或芳基。

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