Metal-phenoxyalkanoic acid interactions—XXIII. Complexes of copper(II) with the phenoxyisobutyric acids. The crystal structures of tetra-μ-[2-methyl-2-(4-chlorophenoxy)propanoato-O,O′)]-bis[(2-aminopyrimidine)copper(II)] and two polyaquacopper(II) tri-μ-[2-methyl-2-phenoxypropanoato-O,O′]-bis[(2-met