A 3-dimensional 3-connected anionic polymeric network of a silver (I)-chromium(III) oxalato complex with tris-(2,2′-bipyridine)iron(II) cations

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Abstract
The crystal structure of [FeII(bpy)3]2+ n [AgCrIII(ox)3] n 2n−, where bpy = bipyridine, ox = Oxalate, C36H24AgCrFeN6O12, has been determined by X-ray diffraction at room temperature. Cubic crystals of tetrahedral shape have space group P213, a = 15.486(3) Å, Z = 4. The absolute structure, with respect to the crystal form {[unk]}, based on the four indexed crystal faces, was refined on F 2 by using a full-matrix procedure to final R = 0.050. The three-dimensional three-connected polymeric anionic silver(I)-chromium(III) tris-oxalate network consists of [AgI(ox)3] and [CrIII(ox)3] subunits. These subunits and the cationic complex [FeII(bpy)3]2+, which templates the structure, are all chiral and exhibit the Λ configuration. The chirality of the anionic decagon connected network corresponds to right-handed helicity. The cationic complexes fill the voids within the anionic network, and the iron(II) centers occupy sites with symmetry 3 at positions x, x, x (Wyckoff letter a). The Ag and Cr atoms occupy also special positions on three-fold rotation axes (Wyckoff letter a). The shortest distance between Ag and Cr in the three-dimensional network is 5.579(2) Å. There are only weak hydrogen bonding contacts of type C – H … O between the bpy ligands and the Oxalate oxygen atoms as acceptors. Overall, this structure represents a rare case of a chiral polymeric decagon framework type which has been accomplished because of the special coordination algorithm of the linking metal ions as well as of the choice of the bis-chelating ligands.

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