The Two‐Dimensional Anion [Sb₆Se₁₀]^2–: Solvothermal Synthesis, Crystal Structure, and Properties of an Iron ­Selenidoantimonate(III) [Fe(phen)₃]Sb₆Se₁₀

Abstract

The iron selenidoantimonate(III) [Fe(phen)3]Sb6Se10 (1) (phen = 1, 10‐phenanthroline) was prepared by reaction of Fe, Sb, Se, phen, and 1, 4‐diazabicyclo[2.2.2]octane in MeOH and H2O mixed solvent under solvothermal conditions. 1 consists of a [Fe(phen)3]2+ cation and a two dimensional [Sb6Se10]2– anion. The [Sb6Se10]2– anion is constructed by SbSe3, SbSe4, and SbSe6 primary building blocks by corner‐ and edge‐sharing, resulting Sb4Se4, Sb5Se5, and Sb6Se6 heterorings and a semi‐cubic Sb4Se6 motif, which act as secondary building units. The octahedral SbSe6 primary unit and semi‐cubic Sb4Se6 motif make compound 1 quite different from the thioantimonates(III). Compound 1 exhibits steep bandgap (Eg) of 1.56 eV, indicating potential semiconducting property. The thermal stability of 1 was also investigated.