Reversible CO-Induced Chloride Shuttling in RhI Tweezer Complexes Containing Urea-Functionalized Hemilabile Ligands

摘要: The urea moiety, which acts as a good hydrogen-bond donor, has been incorporated into hemilabile phosphinoalkyl thioether ligand. Upon reaction of the ligand with RhI precursor, tweezer complex near-parallel planar moieties 2 forms. host−guest interaction Cl− characterized in solution and solid state. binding groups is retained under CO nonpolar solvents to give five-coordinate adduct 3. In polar solvents, results shift from host site metal center concomitant breaking Rh−S bonds. This an unusual example how two types different interactions important molecular recognition (ligand coordination hydrogen bonding) can be regulated within one molecule through small-molecule chemistry.