Terpyridine-fused polyaromatic hydrocarbons generated via cyclodehydrogenation and used as ligands in Ru(ii) complexes
作者:Angelika Graczyk、Frances A. Murphy、Deanne Nolan、Vanesa Fernández-Moreira、Natasha J. Lundin、Christopher M. Fitchett、Sylvia M. Draper
DOI:10.1039/c2dt30548h
日期:——
series of novel fused 4′-substituted 2,2′ : 6′,2′′-terpyridine ligands and their ruthenium(II) complexes were prepared. The unusual 4′-substituents comprised 2,3,4,5-pentaphenylbenzene and its tert-butyl derivative (1 and 2) and the products from oxidative cyclodehydrogenation, i.e. polyaromatic fragments consisting of ten or thirteen fused benzene rings (3 and 4). The syntheses of all the ligands are discussed
Electron Delocalization in a Ruthenium(II) Bis(2,2‘:6‘,2‘ ‘-terpyridyl) Complex
作者:Andrew C. Benniston、Glen Chapman、Anthony Harriman、Maryam Mehrabi、Craig A. Sams
DOI:10.1021/ic035380e
日期:2004.7.1
properties have been recorded for a ruthenium(II) bis(2,2':6',2' '-terpyridine) complex bearing a single ethynylene substituent. The target compound is weakly emissive in fluid solution at room temperature, but both the emission yield and lifetime increase dramatically as the temperature is lowered. As found for the unsubstituted parent complex, the full temperature dependence indicates that the lowest-energy
motion of the fluorobenzene ring, leading to destabilization of the low spin cobalt(II) state; with the magnitude of rotation able to be controlled by an electric field. This first example of spin-state conversion being dependent on the molecular motion of a ligand-appended fluorobenzene ring in a SCO cobalt(II) compound provides new insight for the design of a new category of molecule-based magnetoelectric
Model of the Iron Hydrogenase Active Site Covalently Linked to a Ruthenium Photosensitizer: Synthesis and Photophysical Properties
作者:Sascha Ott、Magnus Borgström、Mikael Kritikos、Reiner Lomoth、Jonas Bergquist、Björn Åkermark、Leif Hammarström、Licheng Sun
DOI:10.1021/ic0303385
日期:2004.7.1
related ruthenium complexes bearing acetylenic terpyridine ligands, with those of [Ru(terpy)2]2+. IR and electrochemicalstudies reveal that the nitrogen heteroatom of the ADT bridge has a marked influence on the electronic properties of the [Fe2(CO)6] core. Using the Rehm-Weller equation, the driving force for an electron transfer from the photoexcited *[Ru(terpy)2]2+ to the diiron site in 1 was calculated
Photophysical investigation of the triplet manifold of mono- and bis-phenylethynyl-(2,2′:6′,2″-terpyridine) ruthenium(II) complexes
作者:Andrew C. Benniston、Glen M. Chapman、Anthony Harriman、Craig A. Sams
DOI:10.1016/j.ica.2005.03.046
日期:2006.2
A complete photophysical study has been carried out on an octahedral ruthenium(II) complex, incorporating two 4'-phenylethynyl-2,2':6',2"-terpyridine ligands. Weak emission is observed from the complex in fluid solution at room temperature, but both emission yield and lifetime increase as the temperature is lowered. Luminescence is confirmed to occur exclusively from the lowest energy triplet metal-to-ligand, charge-transfer (MLCT) state, though higher-lying MLCT and metal-centered states are required to adequately model the non-radiative decay kinetics. A comparison of parameters associated with deactivation of the complex and its counterpart, where only one terpy ligand incorporates the phenylethynyl unit, indicates that only the electron-vibrational coupling element is affected. It is also revealed that the extent of electron delocalisation at the triplet level does not critically depend on the number of 4-phenylethynyl-2,2':6',2"-terpyridine ligands in the complex. (c) 2005 Elsevier B.V. All rights reserved.