Syntheses, structures and properties of a series of new lanthanide chalcoarsenates(III) containing crown-shaped [As 3 Q 6 ] 3− ( Q = S, Se) clusters

摘要: Abstract A series of new lanthanide chalcoarsenates(III) [Ln2(tepa)2(μ-OH)2Cl2]3[As3Q6]2 {Q = S, Ln = Eu (Ia), Tm (Ib); Q = Se, Ln = Y (IIa), Sm (IIb), Eu (IIc), Gd (IId), Tb (IIe), Ho (IIf), Er (IIg), (IIh), Yb (IIi); tepa = tetraethylenepentamine} have been synthesized solvothermally and characterized structurally. Both Ia–b IIa–i are isostructural contain crown-shaped anions [As3Q6]3− with dinuclear [Ln2(tepa)2(μ-OH)2Cl2]2+ cations as counterions. Although a few chalcoarsenates obtained in the presence organic chelating amines by solvothermal reaction, their strongly dominated either noncondensed tetrahedral [AsVQ4]3− or pyramidal [AsIIIQ3]3− moieties. IIa–I provide rare examples based on clusters constructed condensation Their optical properties UV–vis spectroscopy, while photoelectronic magnetic some compounds also investigated.