Synthesis and structure of a polymeric complex between methyl acrylate and copper(I) chloride

Article abstract of DOI:10.1016/0022-328X(89)85391-4

Chloro<2,3-η-(methyl propenoate)>copper(I) has been prepared by reaction between methyl acrylate and copper(I) chloride, previously activated by formation and subsequent decomposition of a tetrameric ?-complex with methyl vinyl ketone.The compound dissociates completely into its costituents CuCl(s) and methyl acrylate, at temperatures above 0 deg C.Its structure has been determined from single-crystal X-ray diffraction data recorded at -1o5 deg C. <(CuCl(C4H6O2)>, M_r = 185.1, crystallizes in space group C2/c with a 14.625(6), b 7.108(3), c 11.681(5) Angstroem, β 93.64(4) deg and Z = 8.Full-matrix least-squares refinement of 91 structural parameters gave R = 0.048 for 1159 observed (I > 3?(I)) reflections.The copper is approximately tetrahedrally coordinated by two chloride ligands, the C=C of one methyl acrylate ligand, and the carbonyl oxygen of another such ligand.The structure can be described in terms of (CuCl)2 dimers bridged by methyl acrylate ligands to form layers in the b-c plane.The ligand tetrahedron exhibits trigonal pyramidal distortion such that copper(I) lies 0.386(3) Angstroem from the plane through the two chloride ligands and the midpoint of the C=C bond.The Cu-C distances are 2.035(6) and 2.067(5) Angstroem, C=C 1.370(8) Angstroem and Cu-O 2.288(4) Angstroem.The methyl acrylate ligand exhibits the s-trans conformation and the skeleton of the molecule deviates slightly from planarity.