A multifunctional sensor for detecting tetracycline, 4-nitrophenol, and pesticides.

In recent years, due to the abuse of antibiotics, nitro explosives and pesticides, which have caused great harm to the environment and human health, social concerns have prompted researchers to develop more sensitive detection platforms for these pollutants. In this paper, a novel two-dimensional Zn (II) coordination polymer, [Zn(L)(1,2-bimb)]·DMF (1), [HL=[1,1':4',1''-terphenyl]-2, 2'',4, 4'' -tetracarboxylic acid, 1,2-bimb = 1,2-bis(imidazol-1-ylmethyl)benzene] was synthesized using a hydro-solvothermal method. Among commonly used organic solvents, 1 exhibits significant stability.

MOFs-based Fe@YAU-101/GCE electrochemical sensor platform for highly selective detecting trace multiplex heavy metal ions.

The construction of sensors with specific recognition functions can easily, sensitively and efficiently detect heavy metal ions, which is a demand in the field of electrochemical sensing and an important topic in the detection of environmental pollutants. An electrochemical sensor based on MOFs composites was developed for sensing of multiplex metal ions. The large surface area, adjustable porosities and channels in MOFs facilitate successful loading of sufficient quantities highly active units.

Three cobalt-based coordination polymers with tripodal carboxylate and imidazole-containing ligands: syntheses, structures, properties and DFT studies.

Three cobalt-based coordination polymers [Co(Htatb)(1,3-bimyb)] (1), [Co(Htatb)(bimbp)]·DMF (2), and [Co(Htatb)(1,4-bimyb)]·HO (3) [Htatb = 4,4',4''--triazine-2,4,6-tribenzoic acid, 1,3-bimyb = 1,3-bis(imidazole-1-ylmethyl)benzene, bimbp = 4,4'-bis(imidazolyl)biphenyl, 1,4-bimyb = 1,4-bis (imidazole-1-ylmethyl)benzene] were synthesized by hydrothermal reactions and characterized by single-crystal X-ray diffraction, thermogravimetric analyses, IR spectroscopy, UV-vis spectroscopy and elemental analysis. Compound 1 shows a double-strand chain structure, due to the intermolecular O-H⋯O hydrogen bonds and aromatic π-π stacking interactions, the adjacent chains are connected to produce a 3D supramolecular structure. Compound 2 shows a 2D structure with a 1D channel.

A novel 3D Cd(ii) coordination polymer generated ligand synthesis involving C-O ester bond formation.

A novel 3D Cd(ii) coordination polymer {[Cd(ddpa)(2,2'-bpy)]·HO} (1) (Hddpa = 5,10-dioxo-5,10-dihydro-4,9-dioxapyrene-2,7-dicarboxylic acid, 2,2'-bpy = 2,2'-bipyridine) is hydrothermally synthesized , and the influencing factors and mechanism for the reaction are briefly discussed. The synthesis of 1 requires the formation of a new C-O ester bond. This current study confirms that metal ions and N-donor ligands play important roles in the domination of the ligand from 6,6'-dinitro-2,2',4,4'-biphenyltetracarboxylic acid (Hdbta).

Design of High-Symmetrical Magnesium-Organic Frameworks with Acetate as Modulator and Their Fluorescence Sensing Performance.

During the formation of magnesium-organic frameworks, the coordination sphere of magnesium tends to be partially occupied by O-containing solvent molecules such as amides, which will dramatically decrease the symmetry of Mg-organic frameworks and thus lead to low stability. It is noted that up to now, most reported Mg-metal-organic frameworks (MOFs) (>80%) crystallize in the space groups whose symmetry is lower than that of a tetragonal system. In this work, we demonstrate that acetate (Ac) may act as modulator to eliminate the influence of amide solvent and improve the symmetry of Mg-organic frameworks.

[Effects of mowing and grazing on soil nutrients and soil microbes in rhizosphere and bulk soil of Stipa grandis in a typical steppe].

This study conducted experiments using Stipa grandis, the dominant species of the typical steppe in Inner Mongolia. The research explored the different effects of mowing and grazing on organic carbon, total nitrogen, available nitrogen, total phosphorus and available phosphorus in rhizosphere and bulk soil. The results showed that: Both mowing and grazing inhibited assemble and storage capacity of rhizosphere, and decreased the organic carbon, total nitrogen, and available nitrogen contents in rhizosphere soil.

catena-Poly[[(1,10-phenanthroline)cobalt]-μ-2,4'-oxydibenzoato].

In the title compound, [Co(C(14)H(8)O(5))(C(12)H(8)N(2))](n), the Co(II) atom is six-coordinated in a distorted octa-hedral coordination geometry by four O atoms from two chelating carboxyl-ate groups from different 2,4'-oxydibenzoate anions and by two N atoms from a 1,10-phenanthroline (phen) ligand. The two benzene rings of the 2,4'-oxydibenzoate ligand form a dihedral angle of 77.14 (16)°.

catena-Poly[zinc(II)-bis-[μ(2)-3-(3-pyrid-yl)-benzoato]-κO:N;κN:O].

In the title compound, [Zn(C(12)H(8)NO(2))(2)](n), the Zn(2+) cation is coordinated by a pair of carboxyl-ate O atoms as well as two pyridyl N atoms to afford a distorted tetra-hedral environment. Adjacent Zn(2+) cations, with a separation of 8.807 (2) Å, are linked by two 3-(3-pyrid-yl)benzoate ligand bridges, generating an infinite ribbon extending parallel to [001].

[Perceptions and adaptation strategies of herders in desert steppe of Inner Mongolia to climate change].

Desert steppe is very vulnerable to climate change. The herders caring for their livestock in such a natural environment have to face the challenges of rapid climate change. In this paper, a household-level questionnaire was conducted in the Suniteyou District of Inner Mongolia, China, aimed to analyze the herders' perceptions and adaptation strategies to climate change, extreme climate events in particular.

1,3-Di-4-pyridylpropane-4,4'-oxy-dibenzoic acid (1/1).

In the title compound, C(13)H(14)N(2)·C(14)H(10)O(5), a 1:1 cocrystal of 1,3-di-4-pyridylpropane (bpp) and 4,4'-oxydibenzoic acid (H(2)oba), the dihedral angle between the two benzene rings of the flexible H(2)oba mol-ecule is 57.07 (1)°; the two pyridine rings of bpp make a dihedral angle of 27.52 (1)°.