Metal–phenoxyalkanoic acid interactions. Part 2. Crystal and molecular structures of diaquabis(phenoxyacetato)manganese(II), diaquabis(p-chlorophenoxyacetato) manganese(II), diaquabis (phenoxyacetato) cobalt(II), diaquabis(p-chlorophenoxyacetato)cobalt(II), diaquabis(phenoxyacetato)magnesium(II), and diaquabis(p-chlorophenoxyacetato)magnesium(II)

Abstract

The crystal structure of diaquabis(phenoxyacetato)manganese(II)(1) has been determined by X-ray diffraction from diffractometer data and refined by least squares to R 0.047 for 1 189 observed reflections. Cystals are orthorhombic, space group Pbca with Z= 4 in a cell of dimensions a= 7.007(4), b= 7.699(4), and c= 33.219 (19)Å. The metal atom is at a centre of symmetry with the co-ordination sphere consisting of six oxygens, two from trans related waters [2.216(2)Å] and four from carboxylates [2.155(2), 2.148(2)Å] forming a two-dimensional polymer in the ab plane at z = 0,½. The manganese ions in this plane are 5.21 Å from one another while in the z direction the separation is 16.6 Å. The phenoxyacetato-ligands lie approximately parallel to the z axis and adopt the synplanar (syn–syn) conformation characteristic of the unco-ordinated phenoxyacetic acid. Powder diffractometer data, preliminary single-crystal X-ray photographs, and chemical analysis confirm that diaquabis(p-chlorophenoxyacetato)manganese(II)(2), diaquabis(phenoxyacetato) cobalt(II)(3), diaquabis(p-chlorophenoxyacetato) cobalt(II)(4), diaquabis(phenoxyacetato)magnesium(II)(5), and diaquabis(p-chlorophenoxyacetato)magnesium(II)(6) are isomorphous and isostructural with (1).