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Synthesis, Photophysical, and Electrochemical Properties of Ru II Polypyridyl Complexes Bridged with two Tetrapodal Symmetric and one Asymmetric Ligands
Author(s) -
Cheng Feixiang,
Chen Jishu,
Sun Chengke,
Tang Ning,
Chen Longhai
Publication year - 2011
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201000252
Subject(s) - chemistry , ligand (biochemistry) , electrochemistry , ruthenium , oxime , medicinal chemistry , bipyridine , stereochemistry , polymer chemistry , crystallography , crystal structure , catalysis , organic chemistry , electrode , receptor , biochemistry
Abstract Two symmetric tetrapodal ligands L 1–2 and one asymmetric tetrapodal ligand L 3 based on 4,5‐diazafluoren have been synthesized and characterized. Ligands L 1–2 formed by the condensation of pentaerythrityl tetratosylate with 4,5‐diazafluoren‐9‐oxime and 9‐(4‐hydroxy)phenylimino‐4,5‐diazafluorene, respectively. L 3 was prepared by two steps, 9‐(4‐hydroxy)phenylimino‐4,5‐diazafluorene reacted with pentaerythrityl tetratosylate affording 1,1′,1"‐tris[(4,5‐diazafluoren‐9‐ylimino)phenoxymethyl]‐1"′‐( p ‐tosyloxymethyl)‐methane, which reacted with 4,5‐diazafluoren‐9‐oxime affording the asymmetric ligand L 3 . Three tetranuclear Ru II complexes [(bpy) 8 L 1–3 Ru 4 ](PF 6 ) 8 (bpy = bipyridine) were obtained by the reaction of Ru(bpy) 2 Cl 2 · 2H 2 O with ligands L 1–3 . Spectroscopic studies of these complexes exhibit metal‐to‐ligand charge transfer absorptions at 440–445 nm and emissions at 575–579 nm. The electrochemical behaviors of these complexes are consistent with one Ru II ‐based oxidation couple and three ligand‐centered reduction couples.