Synthesis and Crystal Structure of K3AsSe4 and K4As2Se5 Containing [AsSe4]3- Anions and a Novel [As2Se5]4- Isomer Featuring an As-As Bond

被引：2

作者：

Menezes, Prashanth W. ^{[1
]}

Faessler, Thomas F. ^{[1
]}

机构：

[1] Tech Univ Munich, Dept Chem, D-85747 Garching, Germany

来源：

ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES | 2012年 / 67卷 / 07期

关键词：

Solvothermal Synthesis; Arsenic; Selenium; Selenoarsenate; Crystal Structure; SOLVOTHERMAL SYNTHESIS; INTERMETALLOID CLUSTERS; 15; ELEMENTS; ZINTL IONS; SELENOARSENATES; CESIUM; SALTS; CAGE;

D O I：

10.5560/ZNB.2012-0117

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Two novel selenoarsenates, K3AsSe4 and K4As2Se5, were synthesized by the mild solvothermal reaction of potassium carbonate and arsenic and selenium powder in the presence of super-heated ethylenediamine and structurally characterized by single-crystal X-ray diffraction. K3AsSe4 crystallizes in the orthorhombic space group Pnma (no. 62) with a = 9.4169(4), b = 10.9695(5), c = 9.7568(8) angstrom, Z = 4 and V = 1007.86(10) angstrom(3) and contains [AsSe4](3-) anions with pentavalent arsenic. K4As2Se5 crystallizes in the monoclinic space group P2(1)/n (no. 14) with a = 7.6167(2), b = 22.8733(4), c = 8.4687(2) angstrom, beta = 107.241(2)degrees, Z = 4 and V = 1409.14(5) angstrom(3), and shows isolated [As(2)Sed](4-) anions. The most prominent feature of the latter anions is the presence of arsenic in two different formal oxidation states (+4/+ 2) due to the presence of an As-As bond.

引用

页码：651 / 656

页数：6

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