Jingyu Han

Hydrazine-solvothermal methods to synthesize polymeric thioarsenates from one-dimensional chains to a three-dimensional framework

A series of polymeric Mn(II)-thioarsenates [Mn(en)3]n[(N2H4)2Mn6(μ6-S)(μ-N2H4)2(μ3-AsS3)4]n (1), [N2H5]n[{Mn(μ-N2H4)2(μ-AsS4)}·0.5en]n (2), [Mn(μ-trien){Mn(μ-N2H4)(μ-AsS3)}2]n (3), [{Mn(N2H4)}2(μ-N2H4)2{Mn(μ-N2H4)2(μ-AsS3)2}]n (4), [Mn3(μ-N2H4)6(μ3-AsS4)(μ2-AsS4)]n (5), and [Mn(NH3)6]n[{Mn(NH3)(μ-AsS4)}2]n (6) were synthesized using a hydrazine-solvothermal method. The thioarsenate units AsS3 and AsS4 coordinate to Mn(II) ions with variable coordination modes, forming a Mn–As–S ternary cluster (1), chains (2, 4–6), and layers (3), respectively. The hydrazine molecules act as inter-cluster, intra-chain and intra-layer bridging ligands to join the Mn(II) ions, resulting in hydrazine hybrid 1-D, 2-D, and 3-D Mn(II)-thioarsenate moieties in 1–5. Compounds 1–6 exhibit tunable semiconducting band gaps varying in the range of 2.19–2.47 eV. Compound 1 displays stronger antiferromagnetic coupling interactions than that of compound 2.

Solvothermal syntheses, crystal structures, optical and thermal properties of new selenidogermanate and polyselenidogermanate

AbstractNew 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 NH4+

Methanolothermal Syntheses, Crystal Structures and Optical Properties of Binuclear Transition Metal Complexes Involving the Bidentate S-Donor Ligand μ-Sn2S6

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Solvothermal syntheses, crystal structures, and optical and thermal properties of transition metal selenidostannates

, [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. Graphical AbstractThe syntheses, structural determination,optical and thermal properties of new selenidogermanate salts, [NH4]2[H2N(CH3)2]2Ge2Se6 (1) and [Ni(dien)2]2Ge2Se5(Se2) (2), and a selenidogermanate complex [{Ni(tepa)}2(μ-Ge2Se6)] (3) are reported.