Two isomeric Au complexes of S-trithiane: One-dimensional polymer assembled through aurophilic interactions

Two isomeric Au complexes, [Au(Stt)Cl]n (1) and [Au(Stt)Cl]4n (2) (Stt = S-trithiane), have been prepared and structurally and spectroscopically characterized. Each compound crystallizes as a unique form with aurophilic interactions between the linear and two-coordinated Au(I) cations. In complex 1, the Au(Stt)Cl molecules self-associate to form 1D nearly linear chains via equivalent aurophilic interactions, whereas the structure of complex 2 features 1D flexural chains composed of zigzag [Au(Stt)Cl]4 tetramers through varying aurophilic interactions. Emission spectra of both complexes at room temperature give strong red luminescence.