Synthesis and Characterization of a Triphos Ligand Derivative and the Corresponding Pd II Complexes

Tridentate Phosphine Ligands Bearing Aza-Crown Ether Lariats

Crown ethers are useful macrocycles that act as size-selective binding sites for alkali metals. These frameworks have been incorporated into a number of macromolecular assemblies that use simple cations as reporters and/or activity triggers. Incorporating crown ethers into secondary coordination sphere ligand frameworks for transition metal chemistry will lead to new potential methods for controlling bond formation steps, and routes that couple traditional ligand frameworks with these moieties are highly desirable. Herein we report the syntheses of a family of tridentate phosphine complexes bearing tethered aza-crown ethers (lariats) designed to modularize the variation of aza-crown size, lariat length, and distal phosphine substituents, followed by the synthesis and solid-state structures of Mo(III) complexes bearing cations in the pendent crown ethers.

Monodentate phosphine substitution in [Pd(κ3-dppf)(PR3)][BF4]2 (dppf = 1,1′-bis(diphenylphosphino)ferrocene) compounds

The synthesis and dissociative monodentate phosphine substitution of [Pd(κ³-dppf)(P(p-C₆H₄R)₃)][BF₄]₂ compounds is presented. DFT calculations further examines the nature of the Fe–Pd interaction of the κ³-dppf ligand.