Issue 27, 2015
From the journal:

Physical Chemistry Chemical Physics

Emission spectroscopy of a ruthenium(ii) polypyridyl complex adsorbed on calcium niobate lamellar solids and nanosheets†

Kazuhiko Maeda,*a   Takayoshi Oshimaa  and  Osamu Ishitania  

* Corresponding authors

a Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1-NE-2 Ookayama, Meguro-ku, Tokyo 152-8550, Japan
E-mail: maedak@chem.titech.ac.jp

Abstract

Ru(II) tris-diimine complexes are known to exhibit emission at around 630 nm as a result of 1MLCT photoexcitation. The emission is quenched in the presence of a suitable semiconductor solid due to electron injection from the excited state of a Ru(II) complex to the conduction band of the adjacent semiconductor. Here we investigated emission quenching behaviour of RuII{(4,4′-(CH3)2-bpy)2(4,4′-(CH2PO3H2)2-bpy)} (bpy = 2,2′-bipryridine) adsorbed on HCa2Nb3O10 solids having an ordered lamellar structure or a disordered nanostructure. Even though electron injection from the excited state of the Ru complex to the conduction band of nanostructured HCa2Nb3O10 is thermodynamically less favorable than that of layered HCa2Nb3O10, faster electron injection was observed using nanostructured HCa2Nb3O10. Experimental results highlighted that electron injection from the excited Ru complex takes place not only in the conduction band of HCa2Nb3O10 but also mid-gap states whose density is strongly dependent on both the morphological feature and the preparation method of HCa2Nb3O10.

Graphical abstract: Emission spectroscopy of a ruthenium(ii) polypyridyl complex adsorbed on calcium niobate lamellar solids and nanosheets

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Article information

DOI
https://doi.org/10.1039/C5CP02050F
Article type
Paper
Submitted
08 Apr 2015
Accepted
11 Jun 2015
First published
15 Jun 2015
This article is Open Access
Creative Commons BY-NC license

Phys. Chem. Chem. Phys., 2015,17, 17962-17966

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Emission spectroscopy of a ruthenium(II) polypyridyl complex adsorbed on calcium niobate lamellar solids and nanosheets

K. Maeda, T. Oshima and O. Ishitani, Phys. Chem. Chem. Phys., 2015, 17, 17962 DOI: 10.1039/C5CP02050F

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