Emission Spectroscopy as a Probe into Photoinduced Intramolecular Electron Transfer in Polyazine Bridged Ru(II),Rh(III) Supramolecular Complexes

Materials

Travis A. White¹  Shamindri M. Arachchige¹  Baburam Sedai¹ 

[1] id="af1-materials-03-04328">Department of Chemistry, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061-0212, U

关键词: emission spectroscopy;    MLCT light absorbers;    polyazine bridging ligands;    supramolecular;    intramolecular electron transfer;   

DOI  :  10.3390/ma3084328

来源: mdpi

【 摘 要 】

Steady-state and time-resolved emission spectroscopy are valuable tools to probe photochemical processes of metal-ligand, coordination complexes. Ru(II) polyazine light absorbers are efficient light harvesters absorbing in the UV and visible with emissive ³MLCT excited states known to undergo excited state energy and electron transfer. Changes in emission intensity, energy or band-shape, as well as excited state lifetime, provide insight into excited state dynamics. Photophysical processes such as intramolecular electron transfer between electron donor and electron acceptor sub-units may be investigated using these methods. This review investigates the use of steady-state and time-resolved emission spectroscopy to measure excited state intramolecular electron transfer in polyazine bridged Ru(II),Rh(III) supramolecular complexes. Intramolecular electron transfer in these systems provides for conversion of the emissive ³MLCT (metal-to-ligand charge transfer) excited state to a non-emissive, but potentially photoreactive, ³MMCT (metal-to-metal charge transfer) excited state. The details of the photophysics of Ru(II),Rh(III) and Ru(II),Rh(III),Ru(II) systems as probed by steady-state and time-resolved emission spectroscopy will be highlighted.

【 授权许可】

CC BY   
© 2010 by the authors; licensee MDPI, Basel, Switzerland.