Holding onto Lots of Hydrogen: A 12‐Hydride Rhodium Cluster That Reversibly Adds Two Molecules of H₂

H Box: The clusters [Rh6(PR3)6H12][BArF4]2 (R=cyclohexyl, iPr; see scheme, pink Rh, orange P) reversibly take up two molecules of H2 under ambient conditions (1 atm H2, 298 K) to give discrete octahedral clusters surrounded by 16 hydride ligands. Supporting information for this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2002/2005/z502221_s.pdf or from the author. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.