Solvothermal syntheses, crystal structures, optical and thermal properties of new selenidogermanate and polyselenidogermanate
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- 作者：SHUZHEN LIU ; PEIPEI SUN ; JINGYU HAN ; YUN LIU ; YALI SHEN…
- 关键词：Selenidogermanates ; nickel ; solvothermal syntheses ; crystal structures ; optical properties
- 刊名：Journal of Chemical Sciences
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：129
- 期：2
- 页码：167-175
- 全文大小：
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry/Food Science, general;
- 出版者：Springer India
- ISSN：0973-7103
- 卷排序：129
文摘
New selenidogermanate salts [NH 4] 2[H 2N(CH 3) 2] 2Ge 2Se 6 (1) and [Ni(dien) 2] 2Ge 2Se 5(Se 2) (2) (dien = diethylenetriamine), and a selenidogermanate complex [{Ni(tepa)} 2(μ-Ge 2Se 6)] (3) (tepa = tetraethylenepentamine) were prepared by solvothermal reactions. Compounds 1 and 2 consist of discrete [Ge 2Se 6] 4− and [Ge 2Se 7] 4− anions, and NH\(_{4}^{+}\), [H 2N(CH 3) 2] + and [Ni(dien) 2] 2+ counter cations, respectively. The [Ge 2Se 6] 4− anion is constructed by two tetrahedral GeSe 4 building units via edge-sharing. In 2, two tetrahedral GeSe 4 units are linked by a corner and a Se–Se bond to form a polyselenidogermanate anion [Ge 2Se 7] 4− containing a five-membered ring Ge 2Se 3. The dimeric [Ge 2Se 6] 4− anion acts as a bridging ligand via the trans terminal Se atoms to link two [Ni(tepa)] 2+ cations, resulting in neutral complex 3. The Ni 2+ ion in 2 is coordinated by two tridentate dien ligands, while it is coordinated by a pentadentate tepa ligand and a selenidogermanate anion in 3. The different coordination environments of Ni 2+ ions indicate the influence of the denticity of ethylene polyamines on the formation of selenidogermanates in the presence of transition metal ions. The compounds 1–rong class="EmphasisTypeBold ">3 exhibit optical band gaps between 2.06 and 2.35 eV.