Efficient Photoswitch System Combining a Dimethyldihydropyrene Pyridinium Core and Ruthenium(II) Bis-Terpyridine Entities

• Published in: Inorganic chemistry Vol. 56; no. 8; pp. 4357 - 4368
• Main Authors: Jacquet, Margot, Lafolet, Frédéric, Cobo, Saioa, Loiseau, Frédérique, Bakkar, Assil, Boggio-Pasqua, Martial, Saint-Aman, Eric, Royal, Guy
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 17-04-2017
• Subjects: Chemical Sciences; or physical chemistry; Theoretical and
• ISSN: 0020-1669; 1520-510X
• DOI: 10.1021/acs.inorgchem.6b02861

Terpyridine ruthenium complexes linked to the dimethyldihydropyrene (DHP) photochromic unit have been synthesized and fully characterized by cyclic voltammetry and absorption and emission spectroscopy. The study of the photoisomerization reaction undergone by the DHP motif under visible light irradiation is reported. In comparison to previous work, the introduction of an electron-withdrawing pyridinium spacer between the chelating terpyridine unit and the DHP skeleton has considerably tuned the photochromic properties of the free ligands and their corresponding complexes in term of time response and photoreversibility. A rapid, reversible, and complete conversion between the closed and the open forms has been clearly evidenced under visible light irradiation. Only slight perturbations have been induced by the presence of ruthenium centers. Experimental findings and their interpretation have been supported by theoretical calculations.