Tetra-aqua-(2-hy-droxy-acetato-κO,O)magnesium nitrate.

In the title complex, [Mg(C(2)H(3)O(3))(H(2)O)(4)]NO(3), the Mg(II) cation is hexa-coordinated by four O atoms from water mol-ecules and two O atoms from a 2-hy-droxy-acetate ligand in a distorted octa-hedral coordination geometry. The structure exhibits a three-dimensional supra-molecular network, which is stabilized by nine different O-H⋯O hydrogen bonds.

Tetra-µ-acetato-κO:O';κO,O':O';κO:O,O'-bis-[(acetato-κO,O')(1,10-phenanthroline-κN,N')europium(III)].

In the title centrosymmetric dinuclear Eu(III) complex, [Eu(2)(CH(3)COO)(6)(C(12)H(8)N(2))(2)], each Eu(III) cation is coordinated by seven O atoms from five acetate anions and two N atoms from one phenanthroline ligand in a distorted tricapped trigonal-prismatic geometry. Four acetate anions bridge two Eu(III) cations to form the dinuclear complex, with an Eu⋯Eu distance of 3.9409 (8) Å. Weak inter-molecular C-H⋯O hydrogen bonding is present in the crystal structure.

catena-Poly[[tetra-µ(3)-isonicotinato-µ(3)-oxalato-µ(2)-oxalato-disamarium(III)disilver(I)] dihydrate].

In the title compound, {[AgSm(C(6)H(4)NO(2))(2)(C(2)O(4))]·H(2)O}(n), the asymmetric unit contains one Sm(III) ion, one Ag(I) ion, two unique isonicotinate (ina) ligands, two half oxalate (ox) ligands (one on an inversion centre, the other on a twofold axis) and one uncoordinated water mol-ecule. The central Sm(III) ion is nine-coordinated by four O-donor atoms from separate bidentate bridging ox ligands and five O-donor atoms from the two ina ligands (both bidentate) and a symmetry-related ina ligand [Sm-O = 2.389 (4)-2.791 (4) Å], giving a distorted monocapped square anti-prismatic geometry. The Ag(I) ion is three-coordinated in a T-shaped geometry involving two ina N-donor atoms [Ag-N = 2.181 (6) and 2.185 (5) Å] and a bridging oxalate O-donor atom [Ag-O = 2.620 (4) Å]. The three-dimensional heterometallic Sm-Ag coordination polymer, having a unique (3,4,6)-connected five-nodal net topology, is constructed from two-dimensional samarium-oxalate layers and pillared Ag(ina)(2) subunits. Inter-molecular water-carboxyl-ate O-H⋯O hydrogen-bonding inter-actions are also present.

Poly[[(µ-1H-benzimidazole-5,6-dicarboxyl-ato)zinc(II)] monohydrate].

The three-dimensional polymeric title compound, {[Zn(C(9)H(4)N(2)O(4))]·H(2)O}(n), contains one crystallographically independent Zn(II) atom, one fully deprotonated 1H-benzimid-azole-5,6-dicarboxyl-ate (bdc) ligand and one uncoordinated water mol-ecule. The Zn(II) atom is four-coordinated by three O atoms and one N atom from the bdc ligands, giving a distorted tetra-hedral coordination geometry. The uncoordinated water mol-ecule is bound to the main structure through a strong bdc-water N-H⋯O hydrogen bond, and two much weaker water-bdc O-H⋯O inter-actions.