Abstract
In the title polymeric coordination compound, {[FePt(CN)4(H2O)2]·1.33CH3OH} n , the FeII cation (site symmetry 4/mm.m) is coordinated by the N atoms of four cyanide anions (CN-) and the O atoms of two water mol-ecules, forming a nearly regular [FeN4O2] octa-hedron. According the Fe-N and Fe-O bond lengths, the FeII atom is in the high-spin state. The cyanide anions act in a bridging manner to connect the FeII and PtII atoms. The [Pt(CN)4]2- moieties (Pt with site symmetry 4/mm.m) have a perfect square-planar shape. The latter anion is located perpendicular to the FeN4 plane, thus ensuring the creation of a three-dimensional framework. The crystal structure features methanol solvent mol-ecules of which 4/3 were located per FeII cation. These solvent mol-ecules are located in hexa-gonal pores; they inter-act with coordinating water mol-ecules through weak hydrogen bonds. Other guest mol-ecules could not be modelled in a satisfactory way and their contribution to the scattering was removed by a mask procedure.
Highlights
Cyanide-based complexes form a large group of coordination compounds, which can offer numerous structures and functionalities
As a result of the ability of the cyanide anion to act in a bridging way, this group often links two different metal cations, enabling the formation of one, two- or threedimensional frameworks
Among all cyanide-based complexes, Hofmann clathrate analogues attract considerable attention. This is a group of polymeric coordination complexes with general formula [M(L)x{M0(CN)y}zÁn(guest/solvent) where M has an octahedral coordination environment with two L ligands in axial positions and four N atoms of bridging cyanide groups in equatorial positions, which link M and M0 metals into infinite layers (Powell & Rayner, 1949; Hofmann & Kuspert, 1897)
Summary
Cyanide-based complexes form a large group of coordination compounds, which can offer numerous structures and functionalities. Among all cyanide-based complexes, Hofmann clathrate analogues attract considerable attention This is a group of polymeric coordination complexes with general formula [M(L)x{M0(CN)y}zÁn(guest/solvent) where M has an octahedral coordination environment with two L ligands in axial positions and four N atoms of bridging cyanide groups in equatorial positions, which link M and M0 metals into infinite layers (Powell & Rayner, 1949; Hofmann & Kuspert, 1897). 2. Structural commentary The FeII cation (site symmetry 4/mm.m; Wyckoff position 3c) exists in an [FeN4O2] coordination environment (Fig. 1), which is formed by the N atoms of four cyanide anions in equatorial positions [Fe1—N1 = 2.155 (18) A ] and the O atoms of two water molecules in axial positions [Fe1— O1 = 2.15 (2) A ]. Whereas small molecules of methanol can fit inside the hexagonal pores of a three-dimensional framework, bulkier acetone or dioxane molecules cannot be placed there, inducing the creation of layers
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