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Binuclear iridium(ii) complexes readily activate H2, in contrast to the behavior of related diiridium(I) species. The reaction occurs at the pocket of the binuclear complex to produce dihydridoiridium(III) complexes containing a bridging and a terminal hydride. Due to their Brønsted acidity, these dihydrido complexes can react with a second molecule of H2 to form trihydrido complexes. This process implies the heterolytic activation of hydrogen.
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Jiménez et al. (1998) studied this question.
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