Solvothermal syntheses,crystal structures,and optical and thermal properties of transition metal selenidostannates |
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| Authors: | Peipei Sun Shuzhen Liu Jingyu Han Yali Shen Hui Sun Dingxian Jia |
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| Affiliation: | 1.College of Chemistry, Chemical Engineering and Materials Science,Soochow University,Suzhou,People’s Republic of China |
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| Abstract: | Four organic–inorganic hybrid selenidostannates, namely [H2en][H2dien][Fe(dien)2]2(Sn2Se6)2 (1), [Fe(dien)2]2Sn2Se6 (2), [Fe(dien)2]FeSnSe4 (3), and [Mn(dien)2]MnSnSe4 (4) (en = ethylenediamine; dien = diethylenetriamine), were prepared in different solvents under solvothermal conditions. Complexes 1 and 2 consist of discrete [Sn2Se6]4? and [Fe(dien)2]2+ ions, as well as organic cations [H2en]2+ and [H2dien]2+ in 1. The dimeric [Sn2Se6]4? anion is formed by two SnSe4 tetrahedra via edge-sharing. Complexes 3 and 4 are composed of one-dimensional polyanions [TMSnSe 4 2? ] n plus [TM(dien)2]2+ counter cations (TM = Fe, Mn). In the [TMSnSe 4 2? ] n anionic chain, the TM and Sn atoms are located at the same metal site with a ratio of 0.5/0.5. The TM1/2Sn1/2Se4 tetrahedra are interlinked via edge-sharing, forming the heterometallic [TMSnSe 4 2? ] n polymeric anion. The [TM(dien)2]2+ cations in 1–2 and 3–4 have u-fac and mer configurations, respectively. In all four crystal structures, the anions and cations are connected into extended structures via weak N–H···Se hydrogen bonds. The band gaps of complexes 1–4 calculated from the solid-state UV–vis diffuse reflectance spectra were at 2.58, 2.60, 2.21, and 2.25 eV, respectively. Thermogravimetric analyses show that complex 1 decomposes in three steps, while complexes 2–4 each decompose in one step. |
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