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The title compound, [Mn(C₁₁H₈O₅)(C₁₂H₈N₂)(H₂O)₂]·H₂O, was obtained under hydro-thermal conditions. The coordination environment of the Mn(II) atom is a distorted MnN₂O₄ octa-hedron defined by two N atoms from 1,10-phenanthroline, two water O atoms and two carboxyl-ate O atoms from two acrylate anions. The bis-monodentate coordination mode of the anion leads to the formation of chains propagating in [010]. Inter-molecular O-H⋯O hydrogen bonds link the chains into a two-dimensional network parallel to (100). In the voids of this arrangement, disordered lattice water mol-ecules are present.

The title Sm(III) compound, {[Sm(C(9)H(7)O(3))(3)(H(2)O)]·H(2)O}(n), was obtained under hydrothermal conditions. Its structure is isotypic with the analogous Eu complex. The latter was reported incorrectly in space group P1 by Yan et al. [J. Mol. Struct. (2008), 891, 298-304]. This was corrected by Marsh [Acta Cryst. B65, 782-783] to P-1. The Sm(III) ion is nine-coordinated by O atoms from one coordinating water molecule and the remaining ones from the 3-(3-hy-droxy-phen-yl)prop-2-enoatate anions (one bidentate, two bidentate and bridging, two monodentate bridging), leading to a distorted tricapped trigonal-prismatic coordination polyhedron surrounded by solvent water mol-ecules. In the crystal, extensive intermolecular O-H⋯O hydrogen-bonding inter-actions and π-π inter-actions [centroid-centroid separation = 3.9393 (1) Å] lead to the formation of a three-dimensional supra-molecular network.

In the title compound, C(24)H(18)N(6)O(2)S(3)·H(2)O, the thia-diazole ring makes dihedral angles of 78.00 (13) and 77.27 (13)° with the quinoline ring systems. In the crystal, mol-ecules are linked into a two-dimensional network by O-H⋯O and C-H⋯O hydrogen bonds.

The title compound, [Cd(C(9)H(7)O(3))(2)(C(10)H(8)N(2))(2)], was synthesized under mild hydro-thermal conditions. The structure of the complex mol-ecule consists of four approximately planar fragments: two 3-(3-hy-droxyphenyl)propenoate residues and two 2,2'-bipyridine ligands [largest deviation from the least-squares planes is 0.240 (1) Å for one of 3-(3-hy-droxy-phenyl)propenoate residues]. The dihedral angles formed by the least-squares planes of the 2,2'-bipyridine ligands and the opposite 3-(3-hy-droxyphenyl)propenoate residues are 22.68 (7) and 26.47 (6)°. The CdN(4)O(4) coordination polyhedron can be described as distorted dodecahedral. Inter-molecular O-H⋯O hydrogen bonds between carboxyl-ate O atoms and hy-droxy groups lead to the formation of chains along the a-axis direction.

The dinuclear title compound, [Nd(2)(C(9)H(7)O(3))(6)(C(10)H(8)N(2))(2)]·2C(10)H(8)N(2)·2H(2)O, was synthesized under hydro-thermal conditions. The centrosymmetric complex consists of two nine-coordinated Nd(3+) cations, six 3-hy-droxy-cinnamate anions and two chelating 2,2'-bipyridine mol-ecules. The coordination geometry around the cations can be best described as distorted tricapped trigonal-prismatic. The carboxyl-ate groups show different coordination and bridging modes. Two of them chelate to one Nd(3+) cation, two bridge the two cations in a bis-monodentate fashion, and two chelate to one and bridge monodentately to the symmetry-related Nd(3+) cation. The dinuclear mol-ecule is surrounded by two 2,2'-bipyridine solvent and two water mol-ecules. Extensive O-H⋯O and O-H⋯N hydrogen-bonding inter-actions between the components lead to the formation of a three-dimensional network.

The title compound, C(34)H(36)N(2)O(6), located on a center of inversion, crystallizes with one half-mol-ecule in the asymmetric unit. The dihedral angle between the benzene rings is 86.19 (2)°. An intra-molecular N-H⋯O hydrogen bond forms a six-membered ring; it affects the conformation of the mol-ecule which adopts a folded rather than open conformation. The crystal packing is stabilized by inter-molecular C-H⋯O inter-actions.

The title compound, C(10)H(10)O(5), was obtained by the reaction of 4-hy-droxy-phenyl-acetic acid with chloro-acetic acid. In the crystal, the mol-ecules form a three-dimensional network by way of inter-molecular O-H⋯O hydrogen bonding.

In the title compound, C(18)H(14)Br(2)N(2)O(3), an intra-molecular N-H⋯N hydrogen bond forms an eight-membered ring. The dihedral angle between the planes of the quinoline system and the benzene ring is 41.69 (1)°. The crystal packing is stabilized by inter-molecular C-H⋯O hydrogen bonds and short Br⋯O inter-actions [3.0079 (19) Å].

The title compound, [Y(2)(C(9)H(7)O(3))(6)(C(10)H(8)N(2))(2)(H(2)O)(2)]·2C(10)H(8)N(2), contains two eight-coordinated Y(III) ions, which are linked by two carboxyl-ate groups from two 2-hy-droxy-cinnamate anions, leading to a centrosymmetric dinuclear structure surrounded by solvent 4,4'-bipyridine mol-ecules. It forms a three-dimensional framework connected by extensive O-H⋯O and O-H⋯N hydrogen-bonding inter-actions.

The title compound, C(12)H(12)N(2)S(2)O(2), consists of a benzothia-zole group and a oxazolidin-1-one linked via a flexible ethane-1,2-diyl spacer. The benzothiazole group and the oxazolidine ring are each almost planar [with maximum deviations of 0.007 (2) and 0.044 (3) Å, respectively] and make a dihedral angle of 9.35 (10)°. In the crystal structure, adjacent mol-ecules were connected through C-H⋯O and C-H⋯N hydrogen bonds, and further extended into a three-dimensional network structure through inter-molecular aromatic π-π stacking inter-actions in which the centroid-centroid distance is 3.590 (1) Å.

In the centrosymmetric dinuclear title complex, [Cu(2)(C(12)H(6)O(4))(2)(C(3)H(7)NO)(4)(H(2)O)(2)], the coordination environment of each Cu(II) atom displays a distorted CuO(5) square-pyramidal geometry, which is formed by two carboxyl-ate O atoms of two μ-1,8-nap ligands (1,8-nap is naphthalene-1,8-dicarboxyl-ate), two O atoms of two DMF (DMF is N,N'-dimethyl-formamide) and one coordinated water mol-ecule. The Cu-O distances involving the four O atoms in the square plane are in the range 1.9501 (11)-1.9677 (11) Å, with the Cu atom lying nearly in the plane [deviation = 0.0726 (2) Å]. The axial O atom occupies the peak position with a Cu-O distance of 2.885 (12) Å, which is significantly longer than the rest of the Cu-O distances. Each 1,8-nap ligand acts as bridge, linking two Cu(II) atoms into a dinuclear structure. Inter-molecular O-H⋯O and C-H⋯O hydrogen-bonding inter-actions consolidate the structure.

In the crystal structure of the title salt, (C(7)H(7)N(2)S)(2)[Mn(C(8)H(8)O(5))(2)]·6H(2)O, the heterocyclic N atom of the 2-amino-benzothia-zole mol-ecule is protonated. The Mn(II) atom (site symmetry ) has a slightly distorted octa-hedral MnO(6) coordination defined by the bridging O atoms of the bicyclo-heptane unit and four carboxyl-ate O atoms of two symmetry-related and fully deprotonated ligands. The crystal packing is stabilized by N-H⋯O hydrogen bonds between the cations and anions and by O-H⋯O hydrogen bonds including the crystal water mol-ecules.

The title complex, {[Co(2)(C(9)H(4)N(2)O(4))(2)(H(2)O)(4)]·3H(2)O}(n), was synthesized hydro-thermally. The unique Co(II) ion is coordin-ated in a distorted octa-hedral coordination environment by two water mol-ecules and three symmetry-related 1H-benzimid-azole-5,6-dicarboxyl-ate (Hbidc) ligands. The Hbidc ligands coordinate via a bis-chelating and mono-chelating carboxyl-ate group and by an imidazole group N atom, bridging the Co(II) ions and forming an extended two-dimensional structure in the ab plane. In the crystal structure, inter-molecular N-H⋯O and O-H⋯O hydrogen bonds connect complex and solvent water mol-ecules, forming a three-dimensional supermolecular network. One of the solvent water mol-ecules lies on a twofold rotation axis.

The title compound, {[Mn(C(10)H(8)N(2))(H(2)O)(4)](C(9)H(7)O(3))(2)·2H(2)O}(n), was obtained by the hydro-thermal reaction of manganese chloride with mixed 3-hydroxy-lcinnamic acid (H(2)L) and 4,4'-bipyridine (4,4'-bipy) ligands. The structure contains [Mn(C(10)H(8)N(2))(H(2)O)(4)](2+) cations with the Mn(II) atoms lying on a centres of inversion and bridged into a linear chain along the a axis by 4,4'-bipy ligands, surrounded by HL(-) anions and uncoordinated water mol-ecules. Extensive O-H⋯O hydrogen-bonding and weak π-π inter-actions [centroid-centroid distance = 3.7572  (3) Å] between the constituents lead to the formation of a three-dimensional supra-molecular network.

The title complex, [Zn(2)(C(12)H(6)O(4))(2)(C(10)H(8)N(2))(2)(H(2)O)(2)]·4H(2)O, is a binuclear complex with two independent Zn(II) ions in a slightly disorted trigonal bipyramidal environment, coordinated by one aqua ligand, two naphthalene-1,8-dicarboxyl-ate ligands and one 2,2'-bipyridine ligand. π-π Inter-actions [centroid-centroid distance of 3.8489 (5) Å] and O-H⋯O hydrogen bonds connect the mol-ecules, forming a three-dimensional structure.