Key indicators: single-crystal X-ray study; T = 100 K; mean (C-C) = 0.004 Å; disorder in solvent or counterion; R factor = 0.034; wR factor = 0.081; data-toparameter ratio = 22.5.The asymmetric unit of the title crystal, [FeCl 2 (C 3 H 9 P) 3 -(CO)]Á[FeCl 2 (C 3 H 9 P) 2 (CO) 2 ]Á2C 4 H 8 O, contains half molecules of the two closely related Fe II complexes lying on mirror planes and a tetrahydrofuran solvent molecule, one C atom of which is disordered over two sets of sites with site occupancy factors 0.633 (9) and 0.367 (9). In both Fe II complex molecules, a distorted octahedral coordination geometry has been observed around the Fe atoms. Weak intermolecular C-HÁ Á ÁO interactions are observed in the crystal structure. Related literature

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