Controlling the White‐Light Generation of [(RSn)4E6]: Effects of Substituent and Chalcogenide Variation. (15th October 2019) - Dornsiepen, Eike
Abstract: Adamantane‐type organotin chalcogenide clusters of the general composition [(RT)4 S6 ] (R=aromatic substituent, T=Si, Ge, Sn) have extreme non‐linear optical properties that lead to highly directional white‐light generation (WLG) upon irradiation with an IR laser diode. However, the mechanism is not yet understood. Now, a series of compounds [(RSn)4 E6 ] (R=phenyl, cyclopentadienyl, cyclohexyl, benzyl, CH2 CH2 (C6 H4 )CO2 Et; E=S, Se), were prepared, characterized, and investigated for their nonlinear optical properties. With the exception of crystalline [(BnSn)4 S6 ], all these compounds exhibit WLG with similar emission spectra; slight blue‐shifts are observed by introduction of cyclopentadienyl substituents, while the introduction of Se in the inorganic core can provoke a red‐shift. These investigations disprove the initial assumption of an aromatic substituent being a necessary precondition; the precondition seems to be the presence of (cyclic) substituents providing enough electron density. Abstract : Auf der Suche nach den Voraussetzungen für die Erzeugung von hoch gerichtetem Weißlicht durch amorphe molekulare Materialien der allgemeinen Formel [(RT)4 E6 ] (R=organische Gruppe, T/E=Gruppe‐14/16‐Elemente) wurden neun neue Verbindungen studiert. Überraschenderweise muss R kein aromatischer Ligand sein, was im Gegensatz zu vorherigen Annahmen steht.