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Two metal–enoxacin complexes, [Ni(H-Ex)2(H2O)2](NO3)2 (1) and Ag2(H-Ex)4(NO3)2 (2) (where H-Ex = enoxacin, Ex = deprotonated enoxacin), have been synthesized and characterized by elemental analysis, infrared spectroscopy, and single crystal X-ray diffraction. Complex 1 is composed of a [Ni(H–Ex)2(H2O)2]2+ core with two uncoordinated nitrates. The Ni(II) lies on the inversion site in a slightly distorted octahedral environment. Complex 2 is a binuclear silver(I) complex, in which two Ag(I) ions are bridged by a weakly bonding bidentate . The coordination modes of enoxacin are monodentate for 2 and bidentate for 1. In addition, 1 and 2 were screened for their activities against several bacteria and showed activities similar to that of free enoxacin; the test compounds were more active against Gram-negative bacteria than Gram-positive bacteria.

Reactions of Ln(ClO4)3 · 6H2O (Ln=La(III), Eu(III), Nd(III)), 1,10-phenanthroline (phen) and phenoxyacetic acid (PA) or 2,4-dichlorophenoxyacetic acid (2,4-D) yield [La(PA)2 (phen)2]2(ClO4)2 (1), [Eu(2,4-D)2(phen)2]2(ClO4)2 (2) and [Nd(2,4-D)3(C2H5OH)] n (3). Compounds 1–3 are characterized by elemental analyses, IR, UV–Vis, ESI-MS spectra and TGA. 1 is also characterized by 1H and 13C NMR. Single crystal X-ray diffraction analyses reveal that 1 and 2 are binuclear, and 3 has a one-dimensional polymeric structure. The La(III), Eu(III) and Nd(III) are nine-coordinate with a distorted tricapped trigonal-prism geometry.

Under hydrothermal conditions, Sm2O3 reacted with ciprofloxacin (Cip), oxalic acid (Ox) and KOH to give a 2D coordination polymer with the empirical formula of [Sm(Cip)(Ox)1.5] · H2O (1). Sm(ClO4)3 · 6H2O reacted with 3,5-dinitrobenzoic acid (dnb) and 1,10-phenanthroline(phen) to afford dimeric Sm(III) complex, [Sm2(Dnb)6(phen)2] (2). X-ray diffraction analyses show that 1 crystallizes in the monoclinic system, C2/c space group, a = 28.279(3), b = 10.4514(8), c = 16.398(2) A, β = 114.053°, V = 4425.8(7) A3, Z = 8, D c = 1.896 Mg m−3, in which the network of SmO8 and oxalate units form an extended two-dimensional layered structure through tetradentate oxalates, the chelated ciprofloxacin alternatively pointed up and down from the 2D plane, and a 3D lamellar structure is formed via strong intermolecular hydrogen bonds of N–H · O and O–H · O; 2 crystallizes in the triclinic system, P space group, a = 12.063(3), b = 12.967(3), c = 13.260(3) A, α = 104.046(4), β = 113.750(4), γ = 100.391(5)°, V = 1749.0(8) A3,...

The hydrothermal reactions of Nd(ClO4)3·6H2O, Gd(ClO4)3·6H2O, Dy(ClO4)3·6H2O, Er(ClO4)3·6H2O with 1,3-dicyanobenzene, give rise to four one-dimensional rare earth-based coordination polymers: [M(3-CNC6H4COO)3(H2O)2] n (where M = Nd (1), Gd (2), Dy (3), Er (4), 3-CNC6H4COO = 3-cyanobenzoato), respectively. Their solid-state structures have been characterized by X-ray single-crystal diffraction studies. The results show that 1,3-dicyanobenzene hydrolyzed to give 3-cyanobenzoato under hydrothermal condition, and the four complexes are isomorphous. Crystal data for 1: triclinic, space group P-1, a = 9.4063(19), b = 11.485(2), c = 12.616(3) A, α = 66.38(3), β = 74.01(3), γ = 86.96(3)°, V = 1197.9(4) A3, Z = 1, D c = 1.704 Mg m−3; for 2: triclinic, space group P-1, a = 9.3712(19), b = 11.446(2), c = 12.627(3) A, α = 65.86(3), β = 73.89(3), γ = 86.84(3)°, V = 1184.8(4) A3, Z = 1, D c = 1.759 Mg m−3; for 3: triclinic, space group P-1, a = 9.3425(19), b = 11.432(2), c = 12.703(3) A, α = 65.28(3), β = 73.80(3), γ =...

A two-dimensional bi-layered supramolecular compound [Cu2(C7H8N4O)4](ClO4)2 has been synthesized by the solvothermal method, and characterized via IR and CHN elemental analysis. The single crystal X-ray data of this compound reveal the complex to be dimeric as a result of terminal –NH2 group of the semicarbazone moiety bridging, which is relatively rare. On this bi-copper(I) complex, another remarkably structural feature is that each Cu atom adopts an unsymmetrical T-shaped geometry comprised of three N atoms from three pyridine-3-carbaldehyde semicarbazone ligands. The molecules are linked into a two-dimensional bi-layered framework by intermolecular N–H ··· O hydrogen bonds.

A new coordination polymer [Pb(C5H4NCOO)2(H2O)] n has been prepared by reaction of Pb(NO3)2 with isonicotinic acid in the presence of equimolar NaOH. Single-crystal X-ray diffraction analysis reveals that the coordination geometry of each lead(II) centre in [Pb(C5H4NCOO)2(H2O)] n is a distorted square antiprism comprised of five O atoms and one N atom from three distinct isonicotinate ligands, and two water molecules. The complex displays a three-dimensional network structure, in which isonicotinate ligands adopt two different bridging coordination modes.

The title compound Cd8(OH)8(SO4)4 (1) obtained under hydrothermal conditions by reacting Cd(OH)2 with 4-aminobenzenesulfonic acid in an aqueous ethanol solution was confirmed by single-crystal X-ray diffraction. Crystal data: P21/c with a = 6.8984(4), b = 7.5640(4), c = 11.3919(5) A, β = 119.763(2)°, V = 516.01(5) A3, H8Cd8O24S4, M r = 1419.50, Z = 1, D c = 4.568 Mg m−3, μ = 8.595 mm−1, F(000) = 648, R = 0.023, wR = 0.060 for 1208 observed reflections [I > 2σ(I )]. The crystal structure of complex 1 forms a three-dimensional (3-D) framework.

Hydrothermal reactions of Nd(ClO4)3·6H2O, Gd(ClO4)3·6H2O and Er2O3 with H3NTA (nitrilotriacetic acid) afford three new lanthanide coordination polymers, {[Nd(NTA)(H2O)]· 2H2O} n (1), {[Gd(NTA)(H2O)]·2H2O} n (2) and {[Er(NTA)(H2O)]·H2O} n (3), characterized by elemental analysis and IR spectroscopy. X-ray single crystal structural analyses showed that 1 and 2 are an isomorphous 2D-layered framework containing the nine-coordinated Nd(III) (or Gd(III)), and woven into a 3D suprastructure by interlayer hydrogen bonding while 3 is a 3D structure with eight-coordinate Er(III).

Hydrothermal treatments of ciprofloxacin with Ni(NO3)2·6H2O and Mn(ClO4)2·6H2O yield two metal complexes: [Ni(H-cip)2(H2O)2](NO3)2·2H2O (1) and [Mn(H-cip)2(H2O)2] (ClO4)2·2H2O (2), confirmed by elemental analysis, IR and single crystal X-ray diffraction analyses. Complexes 1 and 2 were screened for antibacterial activity against Staphylococcus aureas, E. coli, Pseudomonas aeruginos and Candidaalbicans.

A two-dimensional coordination polymer, [Mn(Enox)2]·4H2O, 1 (H-Enox = 1-ethyl-6-fluoro-1,4-dihydro-4-oxo-7-(1-pierazinyl)-1,8-naphtyridine-3-carboxylic acid), has been rationally designed and synthesized under hydrothermal conditions. Compound 1 is self-assembled from bifunctional drug ligand enoxacin and transition metal ion Mn(II) through covalent coordination bonds and hydrogen bondings.

The reaction of silver perchlorate with 2-amino-3-methylpyridine gives a one-dimensional zigzag coordination polymer {[Ag(2-amino-3-methylpyridine)](ClO4)}∞ (1) consisting of single chains. The geometry of all Ag(I) cations is linear: each ion links together two 2-pyridyl (Ag1) rings and two 2-amino (Ag2) groups, with the ligand exhibiting a ‘head-to-head’ orientation. Crystal data: monoclinic P2(1)/c, a = 5.2296(8), b = 20.668(3), c = 8.8716(14) A, β = 100.359(3)°, V = 943.3(3) A3, Z = 2, D c = 2.214 Mg/m3, μ = 2.409 mm−1, F(000) = 612, R1 = 0.0426, wR1 = 0.0980 [I > 2σ(I)], S = 0.969.

The three-dimensional network of lanthanide (III) complexes with isophthalato (IPT) ligand, (Eu[C6H4(COO−)2-1,3](CH3COO−)(H2O)2}·H2O 1 and {Sm[C6H4(COO−)2-1,3](CH3COO−) (H2O)2} H2O 2, has been prepared by the hydro(solvo)thermal reaction of Eu(C1O4)3·6H2O or Sm(C1O4)3·6H2O, 1,3-dicyanobenzene and acetic acid in the presence of ethanol and H2O. In the reaction, 1,3-dicyanobenzene was hydrolyzed to give IPT ligand. Single crystal x-ray analysis revealed that crystals 1 and 2 are isomorphous with the isostructural {M[C6H4(COO−)2-1,3](CH3COO−)(H2O)2}·H2O unit. In 1 and 2, IPT acts as a bridging ligand to connect three adjacent metal atoms, forming a network like an undulating sheet paralleling the bc plane. The carboxylate from acetate bridges two adjacent metal atoms in a tridentate mode between the different sheets to extend the structure into a three-dimensional network.