CRYSTAL-STRUCTURES OF POLYMORPHIC [FE4(ETA-5-C5H5)4S4](PF6)

[Fe4(eta-5-C5H-5)4S4](PF6) crystals showed polymorphism depending on the recrystallization conditions. Recrystallization from acetonitrile-H2O solution gave monoclinic crystals: C2/c with lattice constants a = 18.555(2), b = 7.650(1), c = 17.850(3) angstrom, beta = 96.81(2)-degrees, and Z = 4. Recrystallization from N,N-dimethylacetamide-ether solution gave tetragonal crystals: I4BAR with lattice constants a = 12.917(2), c = 7.637(1) angstrom, and Z = 2. Molecular structures of both crystal systems are almost the same as each other, if the structure for the latter was analyzed assuming that enantiomeric cations are disordered.