Ln3I5(S2N2)(S2)(THF)10 – a new type of molecular compounds

Abstract

Unprecedented complexes of the composition Ln₃I₅(S₂N₂)(S₂)(THF)₁₀ were obtained in the reactions of neodymium and dysprosium iodide-nitrides with sulfur. The inorganic core of the molecules contains the cyclic fragments Ln(μ-S₂)Ln, LnSNSN and LnSN. Ten of the fourteen atoms of the core are coplanar, the remaining four S₂ and I₂ atoms lie in the other two orthogonal planes. The dysprosium complex upon excitation with UV light exhibits the metal-centered luminescence characteristic of the Dy³⁺ ion. Geometric parameters of the molecules, computational data, electron spectroscopy and fluorescence suggest the existence of some conjugation in the mentioned heterocycles.