
%0 Journal Article
%A Engelhardt, LM 
%A Healy, PC 
%A Kildea, JD 
%A White, AH 
%T Lewis-Base Adducts of Group 11 Metal(I) Compounds. XLII. [Cu<sub>4</sub>X<sub>4</sub>L<sub>4</sub>] 'Cubane' Clusters, L = Hindered N-Base Ligand: Synthesis and Structure of the L = 2-(Diphenylmethyl)pyridine Complexes (X = Cl, Br, I)
%J Australian Journal of Chemistry
%D 1989/01/01
%V 42
%N 1
%P 107-113
%K 
%R https://doi.org/10.1071/CH9890107
%U https://www.publish.csiro.au/paper/CH9890107 
%X The synthesis and single-crystal X-ray structure characterization of tetrameric cubane clusters of copper(1) halides with the hindered N-base ligand 2-(diphenylmethy1)pyridine are reported. The chloride, bromide and iodide structures are isomorphous , crystallizing in the tetragonal space group 141/a, a &#8776; 23, c &#8776; 12 Å , Z = 4 tetramers, the tetramer having crystallographically imposed 4 symmetry, well removed from the ideal 43m. In terms of each X3CuN fragment of the core, this distortion results in one of the N-Cu-X angles being enlarged by c. 30º with respect to the other two and one Cu-X bond distance shortened. Cu-N is also shorter than is usual in a four-coordinate environment and the cluster can be envisaged as being constructed from four quasi-linear monomers. The distortions may be attributed to interaction between the 6- and 2-&#945;-substituent-hydrogen atoms and the halide atoms of the core. The effect diminishes with increasing halide size and increasing volume of the Cu4X4 core. 
