Solvothermal Synthesis and Characterization of Lanthanide Chalcogenidostannates [Ln₂(en)₆(μ₂‐OH)₂][Sn₂S₆] (Ln = Dy, Er) and [Dy₂(en)₆(μ₂‐OH)₂][Sn₂Se₆]

Abstract

Abstract New lanthanide chalcogenidostannates [Ln 2 (en) 6 ( μ 2 ‐OH) 2 ][Sn 2 S 6 ] (Ln = Dy ( 1 ), Er ( 2 )) and [Dy 2 (en) 6 ( μ 2 ‐OH) 2 ][Sn 2 Se 6 ] ( 3 ) (en = ethylenediamine) were synthesized by reactions of SnCl 4 and S (or Se) with Ln 2 O 3 oxides under the mild solvothermal conditions. Compounds 1‐3 are isostructural and consist of a binuclear lanthanide(III) complex cation [Ln 2 (en) 6 ( μ 2 ‐OH) 2 ] 4+ and a dimeric anion [Sn 2 E 6 ] 4− (E = S, Se). The anion is composed of two SnE 4 tetrahedra sharing a common edge with C 2h symmetry. All the lanthanide(III) atoms are eight‐coordinate by six nitrogen atoms of three en ligands and two oxygen atoms of two μ 2 ‐OH groups forming distorted bicapped trigonal prisms. In compounds 1 ‐ 3 , extensive hydrogen bonds are formed leading to three‐dimensional networks of anions and cations. Compounds 1 ‐ 3 remove all the organic part in one step upon heating in the nitrogen stream.