Syntheses and Structures of Solvated Tetrasodiumtetrachalcogenostannates [Na4(en)4][SnE4] (en = 1,2-diaminoethane; E = Te, Se), and their Reactions Toward Further Ternary or Quaternary Chalcogenometallates [Mn(en)3]2[Sn2Te6]·4H2O or [Na10(H2O)34][Mn4(μ4-Se)(SnSe4)4]

Different Chemical Environments of [Ge4Se10]4- in the Li+ Compounds [Li4(H2O)16][Ge4Se10]·4.33H2O, [{Li4(thf)12}Ge4Se10], and [Li2(H2O)8][MnGe4Se10], and Ionic Conductivity of Underlying "Li4Ge4Se10"

The crystalline selenido germanates [Li₄(H₂O)₁₆][Ge₄Se₁₀]·4.3H₂O (1), [{Li₄(thf)₁₂}Ge₄Se₁₀] (2), and [Li₂(H₂O)₈][MnGe₄Se₁₀] (3) (thf = THF = tetrahydrofuran) were obtained by an extraction of a glassy ternary phase of the nominal composition Li₄Ge₄Se₁₀ (=Li₂S·2GeSe₂) with water (1) or THF (2) and slow evaporation of the solvent or by being layered with MnBr₂ in H₂O/MeOH (3), respectively. The compounds contain known selenido germanate anions, however, for the first time with Li⁺ counterions. This is especially remarkable for the prominent _∞³{[MnGe₄Se₁₀]^2-} open-framework structure, which was reported to crystallize with (NMe₄)⁺, Cs⁺, Rb⁺, and K⁺ counterions, but it has not yet been realized with the smallest alkali metal cation. Impedance spectroscopic studies on Li₄Ge₄Se₁₀ classify the glassy solid as a moderate Li⁺ ion conductor.

Ionic liquid cations as methylation agent for extremely weak chalcogenido metalate nucleophiles

Selective in situ methylation of terminal chalcogenide ligands of molecular chalcogenido metalate anions in ionothermal reactions with alkylimidazolium-based ionic liquids yields a series of organo-functionalized chalcogenido metalate compounds. We present the syntheses and crystal structures of (C₄C₁C₁Im)_4+x [Sn₁₀S₁₆O₄(SMe)₄][An] _x (1a-1f), (dmmpH)₆[Mn₄Sn₄Se₁₃(SeMe)₄] (2), and (C _n C₁Im)₆[Hg₆Te₁₀(TeMe)₂] (3a, 3b). The methylation was confirmed by Raman spectroscopy, and the optical absorption properties of the methylated compounds were determined and compared to purely inorganic analogs.

Two types of lanthanide selenidostannates(IV) first prepared under the same solvothermal conditions

Two types of lanthanide selenidostannates(iv) [Ln2(tepa)2(μ-OH)2Sn2Se6] {Ln = Y(), Pr (), Dy (), Er (), Tm (); tepa = tetraethylenepentamine} and [Ln2(tepa)2(μ2-OH)2Cl2]2[Sn4Se10]·4H2O {Ln = Y (), Dy (), Er (), Tm ()} have been synthesized under identical solvothermal conditions and characterized structurally. Type I (, , , and ) displays 1-D neutral chains [Ln2(tepa)2(μ-OH)2Sn2Se6]n, while type II (, , and ) contains discrete adamantane-like [Sn4Se10](4-) ions with binuclear lanthanide complex [Ln2(tepa)2(μ-OH)2Cl2](2+) ions as counterions. Although the solvothermal synthetic methods could result in the formation of various transition-metal chalcogenidometalates, such identical experimental conditions usually result in the only stable phases of lanthanide chalcogenidometalates. Hence, two different lanthanide selenidostannates(iv), obtained under same solvothermal conditions and starting materials, have been first observed in this work. The optical properties of all the compounds have been investigated by UV-vis spectra.