Synthetic Molecular Gear Based on Double-Decker Porphyrin Complexes

Soichiro Ogi, Tomohiro Ikeda, Masayuki Takeuchi

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


New rotary molecular machines (1 and 2) were synthetically constructed from two distinct porphyrin-based rotors, a cerium(IV) bis(porphyrinate)s double-decker (CeDD) and a porphyrinatorhodium(III)-based rotor. These rotors are adjacently mounted on rotational axes aligned to near vertical as resembling the bevel-gear-shaped structure. Structural study using NMR analysis reveals that these distinct rotors are connected through a coordination bond between rhodium(III) and a pyridyl group. At temperature from 193 to 393 K, each rotor represents rotational motion driven by heat fluctuation without decomposition into the corresponding precursors in dichloromethane-d2 and tetrachloroethane-d4. Importantly, the mechanical interaction between the teeth of these rotors is strongly dependent on the central metal atom in a DD rotor and the teeth structure in a porphyrinatorhodium(III)-based rotor. Understanding such relationship between the chemical structures and mechanical interaction is of importance for generating cooperative motion in the hybrid machinery system.

Original languageEnglish
Pages (from-to)193-199
Number of pages7
JournalJournal of Inorganic and Organometallic Polymers and Materials
Issue number1
Publication statusPublished - 2013 Jan


  • Cooperative motion
  • Double-decker complex
  • Mechanical interaction
  • Molecular gears
  • Porphyrinoids


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