Abstract

A 2,2'-bipyridine-appended ferrocene rotor, 1,1'-di(5-yl-ethynyl-2,2'-bipyridine)ferrocene, can be switched from a folded/stacked (syn) conformation to an extended/unstacked (anti) conformation by the addition of [Cu(CH3CN)4](PF6) and 6,6'-dimesityl-2,2'-bipyridine. This extension and contraction process was completely reversible and could be triggered either chemically or electrochemically.

Highlights

  • A 2,20-bipyridine-appended ferrocene rotor, 1,10-di(5-yl-ethynyl2,20-bipyridine)ferrocene, can be switched from a folded/stacked conformation to an extended/unstacked conformation by the addition of [Cu(CH3CN)4](PF6) and 6,60-dimesityl-2,20-bipyridine

  • We build on our previous work13c and develop ferrocene rotor systems that can be switched from the syn to anti conformation by the complexation/decomplexation of a copper 6,60-dimesityl-2,20bipyridine fragment

  • The proton signals associated with the bipyridyl and pyridyl rings (Hd–j) of 1a–b were shifted upfield relative to those of the singly armed model compounds 2a–b, indicating that the di-armed ferrocene rotors adopt a stacked conformation in solution (Fig. 2a and b and Electronic supplementary information (ESI),† Fig. S38)

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Summary

Introduction

A 2,20-bipyridine-appended ferrocene rotor, 1,10-di(5-yl-ethynyl2,20-bipyridine)ferrocene, can be switched from a folded/stacked (syn) conformation to an extended/unstacked (anti) conformation by the addition of [Cu(CH3CN)4](PF6) and 6,60-dimesityl-2,20-bipyridine. We build on our previous work13c and develop ferrocene rotor systems that can be switched from the syn to anti conformation by the complexation/decomplexation of a copper 6,60-dimesityl-2,20bipyridine fragment.

Results
Conclusion

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