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A new tellurium-substituted Lindqvist-type polyoxoniobate H2TeNb5O19(5-) was synthesized as a tetramethylammonium salt. When irradiated with a Xe lamp, a water-methanol solution of this cluster showed exceptionally high H2-evolution activity suggesting cocatalysis by the hexaniobate cluster and metallic tellurium, both of which are formed as photodecomposition products.
Son et al. (Tue,) studied this question.