Pyrene-Terminated Tin Sulfide Clusters: Optical Properties and Deposition on a Metal Surface

Herein, we present the synthesis of two pyrene-functionalized clusters, [(R^pyr Sn)₄ S₆ ]⋅2 CH₂ Cl₂ (4) and [(R^pyr Sn)₄ Sn₂ S₁₀ ]⋅n CH₂ Cl₂ (n=4, 5 a; n=2, 5 b; R^pyr =CMe₂ CH₂ C(Me)N-NC(H)C₁₆ H₉ ), both of which form in reactions of the organotin sulfide cluster [(R^N Sn)₄ S₆ ] (C; R^N =CMe₂ CH₂ C(Me)N-NH₂ ) with the well-known fluorescent dye 1-pyrenecarboxaldehyde (B). In contrast, reactions using an organotin sulfide cluster with another core structure, [(R^N Sn)₃ S₄ Cl] (A), leads to formation of small molecular fragments, [(R^pyr Cl₂ Sn)₂ S] (1), (pyren-1-ylmethylene)hydrazine (2), and 1,2-bis(pyren-1-ylmethylene)hydrazine (3). Besides synthesis and structures of the new compounds, we report the influence of the inorganic core on the optical properties of the dye, which was analyzed exemplarily for compound 5 a via absorption and fluorescence spectroscopy. This cluster was also used for exploring the potential of such non-volatile clusters for deposition on a metal surface under vacuum conditions.