Influence of Steric Confinement within Zeolite Y on Photoinduced Energy Transfer between [Ru(bpy)3]2+ and Iron Polypyridyl Complexes
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- 作者：Gavin Sewell ; Robert J. Forster ; Tia E. Keyes
- 刊名：Journal of Physical Chemistry A
- 出版年：2008
- 出版时间：February 7, 2008
- 年：2008
- 卷：112
- 期：5
- 页码：880 - 888
- 全文大小：193K
- 年卷期：v.112,no.5(February 7, 2008)
- ISSN：1520-5215
文摘
The spectroscopic and photophysical properties of zeolite-Y-entrapped [Ru(bpy)3]2+ co-doped with either[Fe(bpy)3]2+ or [Fe(tpy)2]2+ over a range of iron complex loadings are presented. In solution, [Ru(bpy)3]2+undergoes efficient bimolecular energy transfer to [Fe(bpy)3]2+, whereas only radiative or trivial energy transferoccurs between [Ru(bpy)3]2+ and [Fe(tpy)2]2+. In sharp contrast, within zeolite Y, both [Fe(bpy)3]2+ and [Fe(tpy)2]2+ were found to effectively quench the donor emission. Fitting the Perrin model to the photophysicaldata yields an effective quenching radius of 32 and 27 Å, respectively, for [Fe(bpy)3]2+ and [Fe(tpy)2]2+. Thelong-range nature of the quenching suggests Förster energy transfer. Detailed spectroscopic investigationsindicate that [Fe(tpy)2]2+ bound within zeolite Y undergoes significant distortion from octahedral geometry.This distortion results in increased oscillator strength and enhanced spectral overlap, between the [Ru(bpy)3]2+3d
rs/pi.gif" BORDER=0 >-rs/pi.gif" BORDER=0 >* donor emission and the co-incident acceptor 1T2-1A1 ligand field absorption compared with solution.This turns on an efficient energy transfer to [Fe(tpy)2]2+ within the confinement of the zeolite Y supercage.Overall, this is an interesting example of the ability of the zeolite environment to provoke new photophysicalprocesses not possible in solution.
rs/pi.gif" BORDER=0 >-rs/pi.gif" BORDER=0 >* donor emission and the co-incident acceptor 1T2-1A1 ligand field absorption compared with solution.This turns on an efficient energy transfer to [Fe(tpy)2]2+ within the confinement of the zeolite Y supercage.Overall, this is an interesting example of the ability of the zeolite environment to provoke new photophysicalprocesses not possible in solution.