کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1329501 978912 2009 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Sn4As3 revisited: Solvothermal synthesis and crystal and electronic structure
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Sn4As3 revisited: Solvothermal synthesis and crystal and electronic structure
چکیده انگلیسی

A facile one pot method of synthesis of tin arsenide Sn4As3 starting from metallic tin and elemental arsenic under mild solvothermal conditions in ethylenediamine in the presence of ammonium chloride is offered. The dissolving of the tin metal in ethylenediamine and the role of NH4Cl are discussed. The crystal structure of Sn4As3 has been re-determined. It is shown to crystallize in the trigonal non-centrosymmetric space group R3m, (a=4.089(1) Å, c=36.059(6) Å, Z  =3), which differs from the previously reported centrosymmetric structure (R3¯m). The crystal structure of Sn4As3 consists of alternating layers of arsenic and tin atoms that are combined into seven-layer blocks and build up along the c-axis. The major structural feature is the short tin–tin distances (3.24 Å) between the adjacent blocks. The analysis of the density of states and band structure reveals that Sn4As3 should have metallic properties, which is in line with the previously reported experimental observations. Analysis of chemical bonding employing the electron localization function shows that only for the shortest Sn–As contacts the bonding is pairwise, while four-center bonds are formed between arsenic and tin atoms at relatively long distances (>2.85 Å). Moreover, each tin atom holds an electron lone-pair.

Solvothermally synthesized tin arsenide reveals non-centrosymmetric crystal structure and a complicated chemical bonding pattern including multi-center bonds and lone pairs.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Solid State Chemistry - Volume 182, Issue 3, March 2009, Pages 630–639
نویسندگان
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