Toward long-distance mechanical communication: studies on a ternary complex interconnected by a bridging rotary...

Area of Science:

• Supramolecular Chemistry
• Photochemistry
• Molecular Machines

Background:

• Photochromic molecules offer tunable properties upon light irradiation.
• Mechanically Interlocked Molecules (MIMs) are key to developing molecular machines.
• Ferrocene and porphyrin units are valuable components in complex molecular architectures.

Purpose of the Study:

• To construct a heterotropic ternary complex capable of light-induced remote molecular motion.
• To investigate the role of a bridging component in facilitating mechanical movement.
• To establish a prototype for a molecular reacher system.

Main Methods:

• Synthesis of a photochromic dithienylethene derivative (1).
• Assembly of a ternary complex including chiral ferrocene (3*) and zinc porphyrin components (2).
• Photoisomerization studies using UV-Vis spectroscopy and structural analysis.

Main Results:

• A mechanically interlocked ternary complex was successfully synthesized.
• UV or visible light induced isomerization of component 1.
• This isomerization triggered angular motion of component 2, leading to scissoring motion of component 3*.
• The bridging component (2) was essential for directed motion.

Conclusions:

• The ternary complex functions as a prototype molecular reacher.
• Light-induced isomerization can be translated into controlled mechanical motion.
• This system demonstrates potential for remote manipulation of molecular events.