Sc4Pt7Si2 - An Intergrowth Structure of ScPtSi and ScPt Related Slabs

被引：19

作者：

Harmening, Thomas ^{[2
,3
]}

van Wuellen, Leo ^{[1
,3
]}

Eckert, Hellmut ^{[1
,3
]}

Rodewald, Ute Ch ^{[2
,3
]}

Poettgen, Rainer ^{[2
,3
]}

机构：

[1] Univ Munster, Inst Phys Chem, D-48149 Munster, Germany

[2] Univ Munster, Inst Anorgan & Analyt Chem, D-48149 Munster, Germany

[3] NRW Grad Sch Chem, D-48149 Munster, Germany

来源：

ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE | 2010年 / 636卷 / 06期

关键词：

Scandium; Platinum; Silicon; Crystal chemistry; Solid state NMR spectroscopy; SOLID-STATE NMR; SILICIDES;

D O I：

10.1002/zaac.201000003

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The metal-rich silicide Sc4Pt7Si7 was synthesized by arc-melting. Sc4Pt7Si2 crystallizes with its own structure type, space group Pbam. The structure was refined from single-crystal X-ray diffractometer data: a = 647.6(1), b = 1617.1(3), c = 398.96(9) pm, wR2 = 0.0495, 807 F-2 values and 42 variables. Sc4Pt7Si2 is an intergrowth structure of slightly distorted ScPtSi (TiNiSi type) and ScPt (CsCl type) related slabs. The silicon atoms have the typical coordination number 9 (4 Sc + 5 Pt) in the form of a tricapped trigonal prism. Together, the platinum and silicon atoms build up a complex three-dimensional [Pt7Si2] network with short Pt-Si (238-246 pm) and Pt-Pt (282-303 pm) distances. The scandium atoms fill distorted square prismatic or pentagonal prismatic voids within this network, also with short Sc-Pt distances (276-308 pm). The structural difference of these two scandium species is reflected by substantial discrepancies in Sc-45 chemical shifts. The quadrupolar interaction parameters that were estimated from the notation behavior of the two signals were used for an assignment to the two sites.

引用

页码：972 / 976

页数：5

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