Remarkable stabilization of M(12)L(24) spherical frameworks through the cooperation of 48 Pd(II)-pyridine interactions.
Kinetic studies on the ligand exchange of self-assembled M(12)L(24) spherical complexes demonstrate that the multicomponent self-assembly roughly undergoes three stages. Initially, (i) there are very rapid equilibrations (ms(-1)) among the many components; (ii) as more stable structures are formed, the system equilibrates quickly (s(-1) to min(-1)) among the completed and uncompleted self-assemblies; misassembled structures are presumably corrected at this stage; and finally (iii) very slow equilibration (hours to days) at the final stage after the self-assembly completes, producing the kinetic stability of the whole. The half-lives of the ligand exchange processes in the M(12)L(24) complexes are much longer than those for comparable monodentate Pd(II)-pyridine complexes by a factor of approximately 10(5), suggesting that, once formed, the 36-component molecular spheres behave like covalent componds.
Sato
Sota
S
Department of Applied Chemistry, School of Engineering, The University of Tokyo, CREST, Japan Science and Technology Agency (JST), 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
Ishido
Yoshitaka
Y
Fujita
Makoto
M
D008024:Ligands; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D009942:Organometallic Compounds / Q000737:chemistry*; D010165:Palladium / Q000737:chemistry*; D011725:Pyridines / Q000737:chemistry*
D008024:Ligands; D009942:Organometallic Compounds; D011725:Pyridines; D010165:Palladium