Abstract
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.
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This work was supported by the National Natural Science Foundation of China (Grant No. 21171123), and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).
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Crystallographic data for the crystal structures reported in this paper have been deposited in the Cambridge Crystallographic Data Center with CCDC Numbers: CCDC–1490346 (1), CCDC–1490347 (2), and CCDC–1490348 (3), which contain supplementary crystallographic data for this paper. Other supplementary data associated with this article can be found in the online version. Supplementary information is available at www.ias.ac.in/chemsci.
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LIU, S., SUN, P., HAN, J. et al. Solvothermal syntheses, crystal structures, optical and thermal properties of new selenidogermanate and polyselenidogermanate. J Chem Sci 129, 167–175 (2017). https://doi.org/10.1007/s12039-017-1224-3
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DOI: https://doi.org/10.1007/s12039-017-1224-3