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

Abstract

Two types of lanthanide selenidostannates(IV) [Ln₂(tepa)₂(μ-OH)₂Sn₂Se₆] {Ln = Y(Ia), Pr (Ib), Dy (Ic), Er (Id), Tm (Ie); tepa = tetraethylenepentamine} and [Ln₂(tepa)₂(μ₂-OH)₂Cl₂]₂[Sn₄Se₁₀]·4H₂O {Ln = Y (IIa), Dy (IIb), Er (IIc), Tm (IId)} have been synthesized under identical solvothermal conditions and characterized structurally. Type I (Ia, Ib, Ic, Id and Ie) displays 1-D neutral chains [Ln₂(tepa)₂(μ-OH)₂Sn₂Se₆]_n, while type II (IIa, IIb, IIc and IId) 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.