Reversible on/off switching of interactions in rhodathiaboranes with “anomalous” electron counts. Synthesis and molecular structure of [(Ph3P2N][1-dppe-1,2-closo-RhSB9H9]
摘要:
Reconsideration of the ''rule-breaking'' rhodathiaborane 8,8-(Ph(3)P)(2)-8,7-nido-RhSB9H10, its 9-OEt and dppe analogues, reveals the existence of agostic CH --> Rh (from PPh(3)) bonding which accounts for its molecular structure. Deprotonation [H(9, 10) bridging proton] ''switches off'' this agostic bonding and affords a close cluster. This structural change is fully reversible on reprotonation.