Matter of size: Platinum nanocluster formation inside protein cages (LiDps protein) was monitored by noncovalent mass spectrometry. The Pt clusters catalyze hydrogen formation in presence of an iridium photosensitizer (PS; see scheme, TEOA=triethanolamine), and their catalytic activity depends on the cluster size.
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Kang et al. (2008) studied this question.
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