Lewis-Base Adducts of Group 11 Metal(I) Compounds. XLIV. Synthesis and Conformational Systematics of 1 : 1 Copper(I) Halide Nitrogen Base Adducts as [(N-base)CuX₂Cu(N-base)] Dimers (X = Cl, Br, I) and [(N-Base)CuX] Monomers (X = Cl, Br)

Abstract

A complete array of [LcuX₂CuL] dimers for the system CuX/monodentate nitrogen base, L, all X = Cl, Br, I, has been synthesized and structurally characterized for the highly hindered pyridine base L ≈ 1,2,3,4,5,6,7,8-octahydroacridine, enabling comparison of stereochemical parameters with previously characterized [L₂CuX₂CuL₂] arrays (L monodentate ). With L-2,2,6,6-tetramethylpiperidine, a similar dimer is also obtained with copper(I) iodide, but with the chloride and bromide adducts linear monomers [ LCuX ] have been obtained, the first to be structurally characterized for the copper(I) halide/nitrogen base system. In the latter Cu-Cl, Br are 2.087(2) and 2.216(2), 2.202(2) A, Cu-N being 1.923(3) and 1.931(9), 1.9337) Å .