Metal phenoxyalkanoic acid interactions—36. The preparation and crystal structures of tetraaquabis(2-phenoxybenzoato)nickel(ii) dihydrate, diaquabis(4-fluorophenoxyacetato)zinc(ii), catena-diaquabis(phenoxyacetato)cobalt(ii) and tetrakis-μ-[(pentafluorophenoxy)acetato(o,o′)] bis[aquacopper(ii)

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The structures of four complexes involving divalent first-row transition metals and phenoxy substituted carboxylic acids have been determined by X-ray diffraction. These are tetraaquabis(2-phenoxybenzoato)nickel(II) dihydrate (1), diaquabis(4-fluorophenoxyacetato)zinc(II) (2), diaquabis(phenoxyacetato)cobalt(II) (3) and tetrakis-μ-(pentafluorophenoxyacetato)bis[aquacopper(II)] (4). Complex 1 is regular octahedral with trans-related unidentate carboxylate [Ni—O (carboxylate) 2.031(1) Å] and four waters [Ni—O 2.049, 2.104(2) Å]. Complex 2 has a skew trapezoidal bipyramidal stereochemistry, involving four oxygens from two asymmetric bidentate carboxylates [Zn—O 2.107, 2.332(3) Å] and two waters [Zn—O 1.989(4) Å]. The polymeric complex 3 is isomorphous and isostructural with the manganese(II) analogue, with centrosymmetric octahedral CoO 6 stereochemistry comprising four bonds to carboxylate oxygens (both bridging) [Co—O 2.076, 2.087(3) Å] and two to waters [Co—O 2.134(3) Å]. Complex 4 is a pseudo-centrosymmetric tetracarboxylate bridged dimer of the copper(II) acetate hydrate type with a Cu—Cu separation of 2.644(4) Å. Bond distances to copper are 1.96(1) (average, equatorial) and 2.15(1) Å (average, axial, to water).