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In the molecular structure of tetraferrocenyl-[3]-cumulene, (Fc)2C=C=C=C(Fc)2, four ferrocene molecules are connected via a linear bridge consisting of four carbon atoms. At room temperature, the crystal structure has space group P21/a (Z = 1) with a = 13.104 (5), b = 6.121 (2), c = 11.194 (4) Å, β = 114.922 (1)° and V = 814.3 (8) Å3. A phase transition during cooling was not observed from room temperature to 75 K. From high-resolution X-ray powder diffraction data, the structure of the room-temperature phase was solved by the method of simulated annealing and refined by the Rietveld method using rigid bodies and restraints. The crystal structure was found to be highly disordered with the molecules occupying two orientations with equal probability and a 50% occupancy of the carbon atoms in the cumulene bridge. The disorder could be modelled by stacking faults in ordered structures. In contrast to other compounds of this class, the ferrocenyl groups are in a syn rather than in an up–down conformation with respect to the cumulene bridge.

Supporting information

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Text file https://doi.org/10.1107/S0021889800007470/zm0077sup1.txt
Structure factors (REFLIST format)

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Text file https://doi.org/10.1107/S0021889800007470/zm0077sup2.txt
Numerical intensity of each measured point of tetraferrocenyl-\[3\]-cumulene

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Text file https://doi.org/10.1107/S0021889800007470/zm0077sup3.txt
Geometric parameters of tetraferrocenyl-\[3\]-cumulene

CCDC reference: 231731


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