Crystal structure of catena-poly[[gold(I)-μ-cyanido-[diaquabis(2-phenylpyrazine)iron(II)]-μ-cyanido] dicyanidogold(I)]

Abstract

In the title polymeric complex, {[Fe(CN)2(C10H8N2)2(H2O)2][Au(CN)2]} n , the FeII ion, which is located on a twofold rotation axis, has a slightly distorted FeN4O2 octahedral geometry. It is coordinated by two phenylpyrazine molecules, two water molecules and two dicyanoaurate anions, the Au atom also being located on a second twofold rotation axis. In the crystal, the coordinated dicyanoaurate anions bridge the FeII ions to form polymeric chains propagating along the b-axis direction. In the crystal, the chains are linked by Owater—H...Ndicyanoaurate anions hydrogen bonds and aurophillic interactions [Au...Au = 3.5661 (3) Å], forming layers parallel to the bc plane. The layers are linked by offset π–π stacking interactions [intercentroid distance = 3.643 (3) Å], forming a supramolecular metal–organic framework.

Two-Step Spin Crossover in Hofmann-Type Coordination Polymers [Fe(2-phenylpyrazine)2{M(CN)2}2] (M = Ag, Au)

“…The crystals were kept under a mother solution prior to subsequent measurements. It should be noted that it is important to adhere to the proportions and mixing sequence because for AuPhpz there is a certain probability of the production of a coordination compound, [Fe­(CN) 2 (Phpz) 2 (H 2 O) 2 ]­[Au­(CN) 2 ] …”