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Issue 23, 2014
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A study of the optical properties of metal-doped polyoxotitanium cages and the relationship to metal-doped titania

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Abstract

To what extent the presence of transition metal ions can affect the optical properties of structurally well-defined, metal-doped polyoxotitanium (POT) cages is a key question in respect to how closely these species model technologically important metal-doped TiO2. This also has direct implications to the potential applications of these organically-soluble inorganic cages as photocatalytic redox systems in chemical transformations. Measurement of the band gaps of the series of closely related polyoxotitanium cages [MnTi14(OEt)28O14(OH)2] (1), [FeTi14(OEt)28O14(OH)2] (2) and [GaTi14(OEt)28O15(OH)] (3), containing interstitial Mn(II), Fe(II) and Ga(III) dopant ions, shows that transition metal doping alone does not lower the band gaps below that of TiO2 or the corresponding metal-doped TiO2. Instead, the band gaps of these cages are within the range of values found previously for transition metal-doped TiO2 nanoparticles. The low band gaps previously reported for 1 and for a recently reported related Mn-doped POT cage appear to be the result of low band gap impurities (most likely amorphous Mn-doped TiO2).

Graphical abstract: A study of the optical properties of metal-doped polyoxotitanium cages and the relationship to metal-doped titania

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Publication details

The article was received on 21 Feb 2014, accepted on 15 Apr 2014 and first published on 15 Apr 2014


Article type: Paper
DOI: 10.1039/C4DT00555D
Citation: Dalton Trans., 2014,43, 8679-8689
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    A study of the optical properties of metal-doped polyoxotitanium cages and the relationship to metal-doped titania

    Y. Lv, J. Cheng, P. D. Matthews, J. P. Holgado, J. Willkomm, M. Leskes, A. Steiner, D. Fenske, T. C. King, P. T. Wood, L. Gan, R. M. Lambert and D. S. Wright, Dalton Trans., 2014, 43, 8679
    DOI: 10.1039/C4DT00555D

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