Lewis-base adducts of Group 1B metal(I) compounds. VII. Synthesis and structures of the 1 : 1 adducts of copper(I) halides with N,N,N',N'-tetramethyletlrylenediamine

Abstract

1 : 1 adducts of N,N,N',N'-tetramethylethylenediamine ('tmeda') with copper(1) chloride, bromide and iodide have been synthesized and the structures of the solid iodide and chloride derivatives established by single-crystal X-ray diffraction methods. The iodide,(1),is monoclinic, P2₁/c, a 12.370(5), b 12.119(5), c 15.36(1) Å, β 109.16(5)º, Z = 4 dimers; the residual R was 0.067 for 1240 'observed' reflections. The complex is a µµ'-diiodobridged dimer (tmeda)CuI₂Cu(tmeda); thedistance between the pair of four-coordinate copper atoms is very short [2.566(4) A]. The bromide is isomorphous with the iodide. The chloride, (2), is monoclinic, P2₁/_n, a 14.477(3), b 15.063(3),c 9.326(2) Å, β 96.99(2)º, Z = 4 formula units; R was 0.055 for No = 1195. The complex is ionic [Cu(tmeda)₂]⁺ [CuCl₂]^-.