Columnar Organization of Head-to-Tail Self-Assembled Pt4 Rings

摘要

Abstract: Coordination of Ptn2 to a family of tunable Schiff base proligands directs the 12-component self-nassembly of disk-shaped Pt4 rings in a head-to-tail fashion. Aggregation of these S4 symmetric Pt4nmacrocycles into columnar architectures was investigated by dynamic and static light scattering, NMRnspectroscopy, powder X-ray diffraction, and transmission electron microscopy. Data from these experimentsnsupport the formation of columnar architectures for all of the structures studied except when bulky tris(4-ntert-butylphenyl)methyl substituents were present. In this case, aggregation was limited to dimers in CHCl3n(Kdim 3200 200 L moln1 at 25 °C) and a thermodynamic analysis revealed that dimerization is annentropy driven process. Columnar architectures of Pt4 rings with branched 2-hexyldecyl substituents organizeninto lyotropic mesophases in nonpolar organic solvents. These new self-assembled supramolecules arenpromising candidates to access nanotubes with multiple linear arrays of Ptn2 ions.