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 1–3 exhibit optical band gaps between 2.06 and 2.35 eV.