Formation and Related-Behavior of Micro-bowl Morphology Consisting of Ionic Palladium(II) Complexes

Abstract

Reaction of [(bpy)Pd](PF6)2 (bpy = 2,2'-bipyridine) with racemic bis(isonicotinoyl)-1,1'-bi-2-naphtholate (L) in acetone, and followed by addition of chloroform and solvent evaporation allows to form amorphous micro-bowl morphology consisting of [(bpy)PdL]2(PF6)4 without any template or additive. In contrast, the reaction and recrystallization in acetone for 1 week produce parallel-piped single crystals consisting of [(bpy)3Pd3(µ3-HPO4)2](PF6)2. The formations of micro-bowl and parallel-piped single crystal morphologies appear to be primarily associated with the kinetic and thermodynamic control, respectively. The formation of micro-bowls may be attributed to eruption of organic solvents. Cosolvent effects and chemical properties on the formation of micro-bowl morphology have been observed.

Polymeric Bowl‐Shaped Nanoparticles: Hollow Structures with a Large Opening on the Surface

“…[108,109] Different from the widely investigated self-assembly behavior of amphiphilic polymers, the study on the self-assembly of amphiphilic small molecules is still limited. [110,111] In 2006, Zhu and coworkers [112] synthesized an amphiphilic zinc porphyrin derivative linked with 2,2′-bipyridine complexed with palladium (II) dichloride, which could self-assemble into BNPs in the mixture of chloroform/methanol. Zheng et al [113] prepared BNPs from the enantioselective self-assembly of chiral aggregation-induced emission (AIE) phenylacrylonitrile tartaric acids and their enantiomers of chiral amines in the mixture of THF and water.…”

“…Different from the widely investigated self‐assembly behavior of amphiphilic polymers, the study on the self‐assembly of amphiphilic small molecules is still limited. [ 110,111 ] In 2006, Zhu and coworkers [ 112 ] synthesized an amphiphilic zinc porphyrin derivative linked with 2,2′‐bipyridine complexed with palladium (II) dichloride, which could self‐assemble into BNPs in the mixture of chloroform/methanol. Zheng et al.…”