The crystal structures of tetra-mu(3)-chloro-tetrakis[(triphenyl phosphite-P)copper(I)], [Cu4Cl4(C18H15O3P)(4)], and tetra-mu(3)-bromo-tetrakis [(triphenyl phosphite-P)copper(I)], [Cu4Br4(C18H15O3P)(4)], are described. Both have distorted 'cubane' Cu4X4 cores. Distortion of the cubane structure is reflected in X-Cu-X angles > 90 degrees and Cu-X-Cu angles < 90 degrees, and is more pronounced in the bromide complex.
ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS
Pike, Robert D.; Starnes, W H.; and Carpenter, G B., "Cubane tetrameric complexes of copper(I) chloride and bromide with triphenyl phosphite" (1999). ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS. 24.