Translational symmetries in the linear-chain semiconductors K4[Pt2(P2O5H2)4X].cntdot.nH2O (X = Cl, Br, I)
Translational symmetries in the linear-chain semiconductors K4[Pt2(P2O5H2)4X].cntdot.nH2O (X = Cl, Br, I)
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线性链半导体中的平移对称性 K4[Pt2(P2O5H2)4X].cntdot.nH2O (X = Cl, Br, I)
DOI：
10.1021/ja00212a025
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发表时间：
1988
影响因子：
15
通讯作者：
H. Gray
中科院分区：
文献类型：
--
作者：
L. Butler;M. H. Zietlow;C. Che;W. P. Schaefer;S. Sridhar;P. Grunthaner;B. Swanson;R. Clark;H. Gray
研究了直链半导体K/sub4/(Pt/sub2/(P/sub2/O/sub5/H/sub2/)/sub4/X)xNH/sub2/O(X=Cl，Br，I)，缩写为Pt/sub2/Cl，Pt/sub2/Br1，和Pt/sub2/O的固态结构。本文报道了300 K和22K下的Pt/sub2/Cl和19K下的Pt/sub2/Br.的X射线晶体结构。这些结构表明，Pt/sub2/Cl是由具有(AABCCB)/subn/平移对称性的铂/sub2/和铂/sub2/Cl/sub2/交替单元组成的复合体。另一方面，铂/Sub2/BR的X-射线结构显示出等价的铂-铂键和两个略有不同的铂-溴键。拉曼数据证实了铂/亚2/氯的复合结构，并表明铂/亚2/溴是由具有几乎相等的铂-铂键的二聚单元组成的。铂/次级2/溴结构被认为涉及从理想化的(AAB)/次级n/朝向(AABCCB)/次级n/平移对称的轻微扭曲。对铂/SUB_2/I的结构进行了研究，然而，所有的晶体都是孪晶。报道了铂/Sub2/Br的磁化率、微波导电性、ESCA和反射光谱测量；该材料是半导体，在300K时的sigma=10/sup-3/omega/sup-1/cm/sup-1/，禁带宽度为0.08 eV，带宽大于0.05 eV。
The solid-state structures of the linear-chain semiconductors K/sub 4/(Pt/sub 2/(P/sub 2/O/sub 5/H/sub 2/)/sub 4/X) x nH/sub 2/O (X = Cl, Br, I), abbreviated Pt/sub 2/Cl, Pt/sub 2/Br, and Pt/sub 2/O, have been studied. The X-ray crystal structures of Pt/sub 2/Cl at 300 and 22 K and of Pt/sub 2/Br at 19 K are reported. These structures show that Pt/sub 2/Cl is a composite of alternating units of Pt/sub 2/ and Pt/sub 2/Cl/sub 2/ with (AABCCB)/sub n/ translational symmetry. The X-ray structure of Pt/sub 2/Br, on the other hand, shows equivalent Pt-Pt bonds and two slightly different Pt-Br bonds. Raman data confirm the composite Pt/sub 2//Pt/sub 2/Cl/sub 2/ structure for Pt/sub 2/Cl and indicate that the Pt/sub 2/Br species is comprised of dimeric units with nearly equal Pt-Pt bonds. The Pt/sub 2/Br structure is viewed as involving a slight distortion from idealized (AAB)/sub n/ toward (AABCCB)/sub n/ translational symmetry. Structural studies of Pt/sub 2/I were attempted; however, all crystals were twinned. Magnetic susceptibility, microwave conductivity, ESCA, and reflectance spectroscopy measurements are reported for Pt/sub 2/Br; the material is a semiconductor, with sigma = 10/sup -3/ Omega/sup -1/ cm/sup -1/ at 300 K, a bandgap of 0.08 eV, and a bandwidth greatermore » than 0.05 eV.« less