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Updated: Aug 12, 2026
Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
Published on: February 15, 2016
Syntheses and crystal structures of "unligated" copper(I) and copper(II) trifluoroacetates
F A Cotton1, E V Dikarev, M A Petrukhina
1Laboratory for Molecular Structure and Bonding, Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, USA.
Abstract:
Two extremely unstable copper trifluoroacetates with no exogenous ligands, namely, Cu(O2CCF3) (1) and Cu(O2CCF3)2 (2), are prepared for the first time and obtained in crystalline form by deposition from the vapor phase. Their structures are determined by X-ray crystallography. The crystallographic parameters are as follows: for 1, monoclinic space group P2(1)/c, with a = 9.7937(6) A, b = 15.322(1) A, c = 12.002(1) A, beta = 106.493(9) degrees, and Z = 4; for 2, orthorhombic space group Pcca, with a = 16.911(1) A, b = 10.5063(9) A, c = 9.0357(6) A, and Z = 4. Both structures are unique among other CuI and CuII carboxylates, as well as among metal carboxylates in general. Compound 1 consists of a planar rhombus of four copper atoms with sides of 2.719(1)-2.833(1) A and trifluoroacetate ligands bridging the pairs of adjacent metal atoms alternately above and below the plane. The tetrameric units are further aggregated in a polymeric zigzag ribbon [Cu4(O2CCF3)4]infinity by virtue of intermolecular Cu...O contacts. The structure of 2 is built on cis bis-bridged dimers in which every metal atom is also connected with two copper atoms of the neighboring units. The stacking planes in this extended chain are almost perpendicular to one another. The Cu...Cu distance inside the dimer is 3.086(2) A, indicating a nonbonding interaction.
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