Novel pyrazolate-bridged dinuclear Pd(II) diimine complexes that bind inorganic anions

Light-Emitting Self-Assembled Materials Based on d8 and d10 Transition Metal Complexes

“…The dimer-of-dimer structure was found to exhibit a zigzag orientation with an intermolecular Pd­(II)···Pd­(II) separation of 3.117 Å. Yu and co-workers have further utilized this metallo-clips of cis -[Pd 2 (N ∧ N) 2 (μ-1,3-NO 3 ) 2 ] 2+ moiety to construct metallomacrocycles with 1 H -bipyrazole as bridging ligands. − The metallomacrocycles in various geometries were found to self-assemble from the Pd­(II)-containing clips with various bridging ligands consisting of multiple pyrazolato units. A wide range of Pd­(II)···Pd­(II) separations (3.029–3.434 Å) were found in the X-ray crystal structures, which were highly dependent on the nature of the bipyridine and pyrazolato ligands. − In particular, Yam and Yu reported a direct self-assembly methodology in aqueous medium to synthesize a series of positively charged metallomacrocycles where the dimetallic clips of dipalladium­(II,II) diimine moieties would function as the corners while the dipyrazolate dianions were the spacers . Interestingly, all of these complexes adopted a crown shape with a well-defined cavity, capable of encapsulating solvent molecules and anions.…”