Dong-Sheng Ma

Bis(acetato-κO)[1,2-bis­(2-pyridyl­meth­oxy)benzene-κ4N,O,O′,N′]copper(II) tetra­hydrate

In the title compound, [Cu(CH3COO)2(C18H16N2O2)]·H2O, the CuII ion is six-coordinated in a typically Jahn–Teller distorted octahedral environment defined by two O and two N atoms from the ligand and two O atoms from acetate anions. A linear chain structure propagating in [010] is built up by intermolecular O—H⋯O hydrogen bonds involving the uncoordinated water molecules.

Two pairs of Zn(II) coordination polymer enantiomers based on chiral aromatic polycarboxylate ligands: synthesis, crystal structures and properties

Two pairs of Zn-based chiral coordination polymers (CCPs), namely, [Zn((R)-cbca)·H2O], [Zn((S)-cbca)]·H2O], [Zn((R)-cna)·2H2O] and [Zn((S)-cna)·2H2O] {H2cbca = (R) or (S)-4′-(1-carboxyethoxy)-[1,1′-biphenyl]-4-carboxylic acid, H2cna = (R) or (S)-6-(1-carboxyethoxy)-2-naphthoic acid} were synthesized under hydrothermal conditions. Their structures were determined by single-crystal X-ray diffraction analysis and further characterized by elemental analysis, infrared spectroscopy, powder X-ray diffraction, circular dichroism (CD) spectroscopy. CCPs 1–4 crystallized in chiral space groups and the CD spectra demonstrate obvious positive or negative Cotton effects. Second-harmonic generation (SHG) measurements show that CCPs 1–4 are SHG active and the SHG efficiencies are 0.6, 0.6, 0.5 and 0.5 times as much as that of urea, respectively. CCPs 1–4 exhibit relatively high luminescence properties originating from ligand centered emission.

A pair of novel Zn(II) enantiomeric coordination polymers based on a chiral multicarboxylate ligand: synthesis, crystal structures and molecular recognition properties

A pair of Zn(II) enantiomeric coordination polymers, 1-R and 1-S, namely, [Zn4((R)-H3L)2(OH)2(H2O)2]·3H2O {H3L= (R)- or (S)-5-(1-carboxyethoxymethyl)-isophthalic acid}, were synthesized via solvothermal reactions. Their structures were determined by single-crystal X-ray diffraction analysis and further characterized by IR spectra, elemental analyses, thermogravimetric analysis (TGA), solid-state circular dichroism (CD) and powder X-ray diffraction (PXRD). The pair of enantiomers crystallized in the same chiral space group, featuring a 3,6-c net and kgd topological type structure with a point symbol of (43)2(46·66·83). Their CD spectra exhibit obvious positive or negative Cotton effects, indicating their homochirality. 1-R and 1-S also proved to be second-harmonic generation (SHG) active. Moreover, their fluorescent selective recognition towards nitro aromatic compounds and metal cations were also investigated.

3-Benzyl­sulfanyl-1H-1,2,4-triazol-5-amine

In the title molecule, C9H10N4S, the dihedral angle between the benzene and triazole rings is 81.05 (5)°. In the crystal, N—H⋯N hydrogen bonds link the molecules into infinite zigzag chains along [010].

2,2'-(4,6-Dinitro-1,3-phenyl-enedi-oxy)diacetic acid dihydrate.

The skeletons of both independent molecules of the carboxylic acid hemihydrate, C10H8N2O10·0.5H2O, are approximately planar [maximum deviations 0.642 (3) and 0.468 (1) Å]. The deviations arise from the twisting of the nitro groups with respect to the aromatic rings [dihedral angles = 3.24 (2) and 27.01 (1), and 7.87 (1) and 16.37 (2)° in the two molecules]. The crystal structure features intermolecular O—H⋯O hydrogen bonds, which the link the dicarboxylic acid and water molecules into a supramolecular layer network.

Five Co(II) coordination polymers with different counter anions based on [3,5-di(4H-1,2,4-triazol-4-yl)benzoato]− ligand: directed synthesis, structures and magnetic properties

As a continuing challenge to obtain the desired coordination polymers in the synthesis stage, the counter ions, the metal–ligand ratio and the involvement of template have great impact on their structure construction and crystal growth. In this paper, three different crystals of coordination polymers 1–3 {{[CoL(μ2-OH)]}n (1), {[CoL2(H2O)]·H2O}n (2), {[Co3L3(H2O)]·3NO3·4H2O}n (3)} {L = [3,5-di(4H-1,2,4-triazol-4-yl)benzoate]−} were obtained in one pot with HL and Co(NO3)2. By tuning the reactants ratio and employing different templates, each complex could also be synthesized separately. Single-crystal X-ray analyses show that complex 1 exhibited a two-dimensional (2D) layered gek2 net structure. Complex 2 with deprotonated [L]− has two dimensional (2D) nets structure with 3,5L66 topology. Complex 3 displays a new 5,5,6,6-connected three-dimensional (3D) topological network with a point symbol of (410·65)(45·65)2(47·63)2(48·67). When the reactant Co(NO3)2 was changed to CoCl2 or CoSO4, 4 and 5 {{[CoL(Cl)]·H2O}n (4) and {[Co2L2(SO4)(H2O)]·2H2O}n (5)} was formed with a similar structure to that of 1. Complexes 4 and 5 are two-dimensional (2D) frameworks with 4,6L26 topology. Five complexes have been characterized by elemental analysis, infrared spectroscopy, powder X-ray diffraction and thermogravimetry measurements. The magnetic properties of 1–5 are also investigated. The magnetic property investigation reveals that complex 1 exhibits frequency-dependent behavior.

Synthesis, structures, catalytic and anticancer activities of some coordination compounds involving two new triazole derivatives

Five N-heterocyclic carboxylate-based coordination complexes, [Co(L1)2(H2O)2]·2H2O (1), [Cd(L1)2(H2O)2]·2H2O (2), [Co(L2)(H2O)3] (3), [Ni(L2)(H2O)3] (4), and [Cu2(L2)2(H2O)2] (5), have been synthesized and characterized by elemental analysis, IR spectroscopy, Powder X-ray diffraction, thermogravimetric analyses, and single-crystal X-ray crystallography, where HL1 is 2-((5-amino-1H-1,2,4-triazol-3-yl)thio)acetic acid and H2L2 is 2-((5-amino-1-(carboxymethyl)-1H-1,2,4-triazol-3-yl)thio)acetic acid. In these complexes, the hydrogen bonds (H-bonds) play an important role in their packing structures. Complex 1 has nine H-bonds showing a 3-D sqc38 topology. Complex 2 has 17 H-bonds exhibiting a 3-D hxl network. Complexes 3 and 4 are isomorphic, both of which possess ten H-bonds to present a 3-D btc topology. Complex 5 with eight H-bonds forms a 2-D sq1 structure. In addition, complex 3 catalyzes the decolorization of methyl orange. Meanwhile, 1, 3, and 5 show certain anticancer activities to inhibit the growth of HepG2 cells. Five N-heterocyclic carboxylate based coordination complexes are synthesized which all show hydrogen bonding supramolecular structures, and the photocatalytic and anticancer activities of them are investigated.

2-(4-Chloro­phen­yl)acetamide

In the title compound, C8H8ClNO, the acetamide group is twisted out the benzene plane with a dihedral angle of 83.08 (1)°. In the crystal, molecules are linked by N—H⋯O hydrogen bonds, forming layers parallel to the ab plane.

5-(4-Chlorobenzyl)-1H-tetrazole

In the title compound, C8H7ClN4, the phenyl and tetrazole rings are inclined at a dihedral angle of 67.52 (6)°. In the crystal, molecules are linked by an N—H⋯N hydrogen bond into a chain structure along [010]. π–π interactions with centroid–centroid distances of 3.526 (1) Å between adjacent tetrazole rings further link the chains, forming a ribbon structure.

Poly[[triaqua­[μ4-N-(4-carboxyl­ato­phenyl)­iminodiacetato]sodium(I)zinc(II)] dihydrate]

In the title coordination polymer, {[NaZn(C11H8NO6)(H2O)3]·2H2O}n, the Zn atom is coordinated in a distorted tetrahedral environment by three carboxylate O atoms from two (4-carboxylatophenylimino)diacetate ligands and one water molecule; the Na atom is in an distorted octahedral coordination environment formed by four carboxylate O atoms from three (4-carboxylatophenylimino)diacetate ligands and two water molecules. The Zn atoms and Na atoms are linked by (4-carboxylatophenylimino)diacetate ligands into a three-dimensional framework; the uncoordinated water molecules fill the voids of the skeleton and stabilize it by O—H⋯O hydrogen bonds.