Synthesis, Spectroscopic, and Electrochemical Properties of Three Tetranuclear Ruthenium(II) Polypyridyl Complexes Based on 4, 5‐Diazafluorene. Issue 7 (21st May 2013)

• Record Type: Journal Article
• Authors: Cheng, Feixiang; He, Chixian; Yin, Hongju; Tang, Ning; Hou, Nengbang
• Is Part Of: Zeitschrift für anorganische und allgemeine Chemie. Volume 639:Issue 7(2013)
• Page Start: 1284
• Page End: 1290
• Publication Date: 2013-05-21
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry -- Periodicals; 540
• DOI: 10.1002/zaac.201300045
• Languages: English
• ISSNs: 0044-2313

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>Three tetrapodal ligands 1, 2, 4, 5‐tetrakis[4‐(4, 5‐diazafluoren‐9‐ylimino)phenoxymethyl]benzene (L¹), 1, 2, 4, 5‐tetrakis[2‐(4, 5‐diazafluoren‐9‐ylimino)phenoxymethyl]benzene (L²), and 1, 2, 4, 5‐tetrakis[(4, 5‐diazafluoren‐9‐ylimino)methyl]benzene (L³), and their corresponding Ru^II polypyridyl complexes [{Ru(bpy)₂}₄(μ₄‐L^1–3)](PF₆)₈ (bpy = 2, 2′‐bipyridine) were synthesized and characterized. The spectroscopic behavior of the three complexes was investigated by UV/Vis absorption and emission spectroscopy. They display metal‐to‐ligand charge transfer (MLCT) absorptions at around 443 nm in CH₃CN solution at room temperature, and emission at around 575 nm in EtOH/MeOH (4:1, v/v) glassy matrix at 77 K. Electrochemical studies of the three complexes show one Ru^II‐based oxidation at around 1.35 V and three ligand‐based reductions.</p> </abstract>