title: A triclinic polymorph of bis-(μ(2)-ethane-thiol-ato)-1:2κS:S;3:4κS:S-(μ(4)-disulfido-1:2:3:4κS:S:S':S')tetra-kis-[tricarbonyl-iron(II)](2 Fe-Fe).
abstract: Next to the monoclinic polymorph [Cheng et al. (2005 ▶). Acta Cryst. E61, m892-m894], the triclinic title compound, [Fe(4)(C(2)H(5)S)(2)(S(2))(CO)(12)], is the second known form of this composition. The structure is composed of an [Fe(2)(C(2)H(5)S)(S)(CO)(6)] subcluster, which is linked to its counterpart by an inversion centre located at the mid-point of the central disulfide bond. The Fe(2)S(2) core of each subcluster exhibits a butterfly-like shape, with two S atoms bridging two Fe atoms. In the subcluster, each Fe atom is coordinated in a distorted octa-hedral coordination by three terminal carbonyl C atoms, two S atoms and one Fe atom. The crystal packing is accomplished through van der Waals inter-actions.
authors.forename: Youtao
authors.initials: Y
authors.lastname: Si
authors.forename: Hui
authors.initials: H
authors.lastname: Chen
authors.forename: Chang Neng
authors.initials: CN
authors.lastname: Chen