What question did this study set out to answer?

Investigate the magnitude of the energy barrier hindering mutual rotation between the cyclopentadienyl rings in ferrocene derivatives.

The Structure and Chemistry of Ferrocene. III. Evidence Pertaining to the Ring Rotational Barrier

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Chemical investigation demonstrates low rotational barriers in substituted ferrocenes, indicating unrestricted cyclopentadienyl ring rotation.

Investigate the magnitude of the energy barrier hindering mutual rotation between the cyclopentadienyl rings in ferrocene derivatives.
Synthesized and characterized isomeric substituted ferrocene compounds to probe conformational stability.
Evaluated chromatographic and chemical separation behavior to test for isolable rotational isomers.
Failed to isolate distinct rotational isomers across multiple substituted ferrocene analogs.
Demonstrated qualitatively that the internal barrier preventing ring rotation about the iron-ring axis is remarkably small.

Rosenblum et al. (1958) studied this question.

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Chemical investigation demonstrates low rotational barriers in substituted ferrocenes, indicating unrestricted cyclopentadienyl ring rotation.