Acta Cryst. (2009). E65, m300-m301  [ doi:10.1107/S1600536809005285 ]

Monomers, dimers, and trimers of [Au(CN)₂]^- in a Ba(diaza-18-crown-6)²⁺ coordination polymer

C. M. Beavers, L. Paw U and M. M. Olmstead

Abstract: The structure of the title compound, poly[triaquatetra--cyanido-tetracyanidobis(1,4,10,13-tetraoxa-7,16-diazacyclooctadecane)dibarium(II)tetragold(I)], [Au₄Ba₂(CN)₈(C₁₂H₂₆N₂O₄)₂(H₂O)₃]_n, displays O-HN hydrogen bonding between water molecules and cyano ligands and an unusual pattern of aurophilic interactions that yields a monomer, dimer, and trimer of [Au(CN)₂]^- within the same crystal structure. In two of the five Au positions, the atom resides on a center of inversion. The overall arrangement is that of a coordination polymer assisted by aurophilic and hydrogen-bonded interactions.

Online 21 February 2009

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