Five 3D Co(II)-MOFs constructed from 5-(2-methylimidazol-1-yl) isophthalic acid and different bis(imidazole) ligands and one of their derivatives as an efficient electrocatalyst for ORR.

In this work, four different bis(imidazole) ligands, namely 1,4-bis(1-imidazolyl)benzene (bib), 4,4'-bis(1-imidazolyl)biphenyl (bibp), 1,4-bis (imidazol-1-ylmethylene)benzene) (bimb) and 4,4'-bis(imidazol-1-yl)diphenyl ether (bidpe), were used as the second ligand to give rise to the structural diversity of a coordination polymer based on the cobalt-miipa (Hmiipa = 5-(2-methylimidazol-1-yl) isophthalic acid) system. In compound 1, miipa coordinates to Co(II) atoms to form the Co-miipa 3D network. On introducing linear bis(imidazole) ligands with different lengths and rigidities into the Co(II)-miipa system, the obtained compounds 2-4 form similar three-fold interpenetrating 3D MOFs constructed from the Co(II)-miipa layers pillared by bis(imidazole) ligands.

Three novel MOFs constructed from 1,3,5-tris(1-imidazolyl)benzene and dicarboxylate ligands with selective adsorption for CH/CH and CH/CH.

The urothermal reactions of Co(II)/Zn(II) salts with the diverse carboxylic acid and 1,3,5,-tris(1-imidazolyl)benzene(tib) ligands afforded three novel MOFs, namely, [Co(tib)(abdc)(ox)]·6HO (1), [CoO(tib)(abdc)(DMI)]·2DMI·2HO (2) and [ZnI(tib)(napdc)]·2DMI·2HO (3), (Habdc = 5-amino-1,3-benzenedicarboxylate, Hnapdc = 1,4-naphthalene dicarboxylic acid and DMI = 1,3-dimethyl-2-imidazolidinone). In compounds 1 and 2, the Co(II) atoms are connected by polycarboxylate ligands to form two-dimensional (2D) layers that are pillared by tib ligands leading to the formation of 3D porous frameworks. In compound 3, the Zn(II) atoms are linked by tib ligands to form one-dimensional ribbon-like chains which are further connected by polycarboxylate ligands, making a 3D framework possible.

The effect of chelating agents on iron plaques and arsenic accumulation in duckweed (Lemna minor).

Iron plaques have been found to limit the phytoremediation efficiency by reducing iron solubility, while chelating agents can increase the bioavailability of iron from Fe plaques to numerous terrestrial plants. However, the effects of chelating agents on Fe plaques along the As accumulation in aquatic plants remain unknown. In this study, the effects of five chelating agents (EDTA, DTPA, NTA, GLDA, and CA) on the As (As(III) or As(V)), phosphate, and iron uptake by iron plaques and duckweed (Lemna minor) were examined.

Four 3D Co(ii) MOFs based on 2,4,6-tris(4-pyridyl)-1,3,5-triazine and polycarboxylic acid ligands and their derivatives as efficient electrocatalysts for oxygen reduction reaction.

Different aromatic polycarboxylic acids are employed as auxiliary ligands to give rise to structural diversities in Co(ii)-tpt (tpt = 2,4,6-tris(4-pyridyl)-1,3,5-triazine) frameworks. By introducing various secondary aromatic polycarboxylate anions, namely, biphenyl-3,4',5-tricarboxylic acid (Hbpt), 1,3,5-benzenetricarboxylic acid (Hbtc) and 2,6-dimethyl pyridine-3,5-dicarboxylic acid (Hdmdcpy) into the Co(ii)-tpt system (tpt = 2,4,6-tris(4-pyridyl)-1,3,5-triazine), four new complexes [Co(tpt)(Hbpt)]·0.5DMDP (1) (DMDP = N,N' = dimethylpropyleneurea), [Co(btc)(tpt)(HO)]·3HO (2), [Co(btc)(tpt)Cl]·DMDP·1.

Three 3D Co(ii) cluster-based MOFs constructed from polycarboxylate acids and bis(imidazole) ligands and their derivatives: magnetic properties and catalytic performance for the ORR.

Three 3D polymeric complexes containing polynuclear Co(ii) units, [Co(bpda)(bib)]·HO (1), [Co(OH)(HO)(bpda)(bib)]·2HO (2), and [Co(OH)(bib)(bpt)]·HO (3) (Hbpda = biphenyl-2,4'-dicarboxylic acid, Hbpt = biphenyl-3,4',5-tricarboxylic acid, bib = 1,4-bis(1-imidazolyl)benzene), have been prepared by urothermal synthesis. Complex 1 exhibits an unusual (4,6)-connected 3D network based on binuclear Co(ii) clusters and Co centers bridged by bpda and bib ligands. Complex 2, containing a novel pentanuclear Co(ii) cluster, features a porous 3D MOF with a regular nanosized tunnel.

Study on Color Quantitative Expression, Replication and Color Origin of Gray-Purple Nephrite from Qinghai, China Based on Spectroscopy Methods.

Color is one of the most important factors in evaluating the quality and price of jewelry. Quantitative research on color of jewels has been a hotspot in gemological science. Whether for jewelry industry or gems research, observing and describing the gems’ color characteristics under transmission light is an essential method.

Berberine-loaded solid lipid nanoparticles are concentrated in the liver and ameliorate hepatosteatosis in db/db mice.

Berberine (BBR) shows very low plasma levels after oral administration due to its poor absorption by the gastrointestinal tract. We have previously demonstrated that BBR showed increased gastrointestinal absorption and enhanced antidiabetic effects in db/db mice after being entrapped into solid lipid nanoparticles (SLNs). However, whether BBR-loaded SLNs (BBR-SLNs) also have beneficial effects on hepatosteatosis is not clear.

A novel two-dimensional cadmium(II) complex: poly[diaquatris(μ4-cyclohexane-1,4-dicarboxylato)bis[2-(pyridin-4-yl)-1H-benzimidazole]tricadmium(II).

The title compound, [Cd3(C8H10O4)3(C12H9N3)2(H2O)2]n or [Cd3(chdc)3(4-PyBIm)2(H2O)2]n, was synthesized hydrothermally from the reaction of Cd(CH3COO)2·2H2O with 2-(pyridin-4-yl)-1H-benzimidazole (4-PyBIm) and cyclohexane-1,4-dicarboxylic acid (1,4-chdcH2). The asymmetric unit consists of one and a half Cd(II) cations, one 4-PyBIm ligand, one and a half 1,4-chdc(2-) ligands and one coordinated water molecule. The central Cd(II) cation, located on an inversion centre, is coordinated by six carboxylate O atoms from six 1,4-chdc(2-) ligands to complete an elongated octahedral coordination geometry.

Cd(II) and Co(II) coordination polymers constructed from benzene-1,4-dicarboxylic acid and 2-(pyridin-3-yl)-1H-benzimidazole ligands.

In poly[aqua(μ3-benzene-1,4-dicarboxylato-κ(5)O(1),O(1'):O(1):O(4),O(4'))[2-(pyridin-3-yl-κN)-1H-benzimidazole]cadmium(II)], [Cd(C8H4O4)(C12H9N3)(H2O)]n, (I), each Cd(II) ion is seven-coordinated by the pyridine N atom from a 2-(pyridin-3-yl)benzimidazole (3-PyBIm) ligand, five O atoms from three benzene-1,4-dicarboxylate (1,4-bdc) ligands and one O atom from a coordinated water molecule. The complex forms an extended two-dimensional carboxylate layer structure, which is further extended into a three-dimensional network by hydrogen-bonding interactions. In catena-poly[[diaquabis[2-(pyridin-3-yl-κN)-1H-benzimidazole]cobalt(II)]-μ2-benzene-1,4-dicarboxylato-κ(2)O(1):O(4)], [Co(C8H4O4)(C12H9N3)2(H2O)2]n, (II), each Co(II) ion is six-coordinated by two pyridine N atoms from two 3-PyBIm ligands, two O atoms from two 1,4-bdc ligands and two O atoms from two coordinated water molecules.

Characterization, pharmacokinetics, and hypoglycemic effect of berberine loaded solid lipid nanoparticles.

The high aqueous solubility, poor permeability, and absorption of berberine (BBR) result in its low plasma level after oral administration, which greatly limits its clinical application. BBR solid lipid nanoparticles (SLNs) were prepared to achieve improved bioavailability and prolonged effect. Developed SLNs showed homogeneous spherical shapes, small size (76.

(Ethano-lato-κO)[N'-(3-meth-oxy-2-oxidobenzyl-idene-κO(2))benzo-hydrazidato-κ(2)N',O]oxidovanadium(V).

In the title complex, [V(C(15)H(12)N(2)O(4))(C(2)H(5)O)O], the V(V) ion is coordinated by an oxide O atom, an ethano-late anion and two O atoms and one N atom from the tridentate benzo-hydrazidate dianion in a distorted square-pyramidal geometry; the V atom is displaced by 0.4748 (8) Å from the basal plane towards the axial oxide O atom. An intra-molecular O-H⋯N hydrogen bond occurs in the benzohydrazidate ligand.

[Gemology characterization and identification of beryllium diffused, heated and untreated bicolor sapphires from Changle City, China].

Be-diffused, heated and untreated bicolor sapphires (blue and yellow) from Changle City, Shandong Province, China were studied by using standard gemological methods, ultraviolet-visible (UV-Vis) spectroscopy, infrared (IR) spectroscopy, electron microprobe, and laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) to obtain the spectra characterization, and to suggest identification methods for them. Only Fe(3+)-Fe3+ absorption bands formed in ultraviolet region appear in Be-diffused bicolor sapphire, which is especially strong at 377 nm. In IR absorption spectra, absorption peak at 3 310 cm(-1) appears in heated and untreated bicolor sapphires, while it disappears in Be-diffused bicolor sapphire.

[Case-control study on therapeutic effects of elastic stable intramedullary nails in the treatment of stable and unstable fractures of femoral shaft in children].

Objective: To investigate curative effects of elastic stable intramedullary nails in the treatment of stable and unstable fractures of femoral shaft in children and to guide its clinical application.

Methods: From January 2008 to October 2010,44 children with femoral shaft fractures were treated,including 24 boys and 20 girls,ranging in age from 5 to 12 years, with an average of 7.4 years.

[Successful short-segment fixation for thoracolumbar burst fractures using CYL-pedicle screw].

Objective: To access the efficacy of posterior short-segment fixation for single level thoracolumbar burst fractures without spinal injury using CYL-pedicle screw.

Methods: From September 2007 to December 2009, 74 cases who underwent posterior short-segment fixation for single level thoracolumbar burst fractures (Denis burst fracture type A, B, C) without spinal injury were analyzed retrospectively. There were 53 male and 21 female, mean age was (39 ± 15) years.

Bis[[aqua-(1H-imidazo[4,5-f][1,10]phenanthroline-κN,N)cadmium]bis-(μ-pyridine-2,3-dicarboxyl-ato)-κN,O:O;κO:N,O].

In the title compound, [Cd(2)(C(7)H(3)NO(4))(2)(C(13)H(8)N(4))(2)(H(2)O)(2)], the Cd(II) ion is six-coordinated by two N atoms from a 1H-imidazo[4,5-f][1,10]phenanthroline (IP) ligand, one N atom and one O atom from a pyridine-2,3-dicarboxyl-ate (pdc) ligand, one O atom from another pdc ligand and one water mol-ecule in a distorted octa-hedral geometry. Two Cd(II) ions are bridged by a pair of pdc ligands, forming a centrosymmetric dinuclear structure. Neighboring dinuclear units are linked by the coordinated water mol-ecules through O-H⋯N and O-H⋯O hydrogen bonds, forming a layer parallel to (011).

Bis[μ-N'-(2-methyl-1-oxidopropanyl-idene)-2-oxidobenzohydrazidato]tetra-pyridine-trinickel(II).

The asymmetric unit of the title trinuclear Ni(II) compound, [Ni(3)(C(11)H(11)N(2)O(3))(C(5)H(5)N)(4)], contains two independent mol-ecules which are located on individual inversion centres. The central Ni atom, located on an inversion centre, is coordinated by two pyridine N atoms and is further N,O-chelated by two N-(2-methyl-propano-yl)salicyloylhydrazidate anions in an elongated octa-hedral coordination geometry. The terminal Ni atom is coordinated by a pyridine ligand and is further N,N',O-chelated by an N-(2-methyl-propano-yl)salicyloyl-hydrazidate anion in a distorted square-planar coordination geometry.

[The effects of administration of valproic acid on organ function and outcome in a canine lethal hemorrhagic shock model].

Objective: To investigate the effects of valproic acid (histone deacetylase inhibitor) on visceral function and outcome in a canine lethal hemorrhage model.

Methods: Twenty male Beagle canines were subjected to an about 42% of total blood volume loss to reproduce a lethal hemorrhage shock model. Animals were randomly divided into shock control group (SC group) and valproic acid treatment group (VPA group), each group n=10.

A tri-layer structure consisting of novel heptacobaltate clusters and single cobalt centers bridged by 5-tert-butyl isophthalate.

A 2D tri-layer compound {[Co(8)(tbip)(6)(H(2)O)(9)(OH)(4)]·12(H(2)O)}(n) (1) (H(2)tbip = 5-tert-butyl isophthalic acid) consisting of novel heptacobaltate clusters and single cobalt centers bridged by tbip(2-) ligands has been hydrothermally synthesized. The complex represents a rare example of a homometallic coordination polymer built up from both heptanuclear metal clusters and single metal centers simultaneously. The magnetic investigation reveals that the complex exhibits the overall predominance of antiferromagnetic coupling between magnetic centers.

Inorganic-organic hybrid compounds based on molybdenum oxide chains and tetrazolate-bridged polymeric silver cations.

Three inorganic-organic compounds based on [Mo(x)O(y)](n-) chains, [Ag(4)(3-pttz)(2)Mo(3)O(10)] (1) (3-pttz = 5-(3-pyridyl) tetrazolate), [Ag(4)(2-pttz)(2)Mo(4)O(13)] (2) (2-pttz = 5-(2-pyridyl) tetrazolate), and [Ag(4)(pzttz)(2)Mo(4)O(13)] (3) (pzttz = 5-(pyrazinyl) tetrazolate), have been self-assembled, accompanied by in situ formation processes of the 5-substituted tetrazolate ligands under hydrothermal condition. Compound 1 features a 3D framework composed of [Mo(3)O(10)](2-) chains cross-linked by [Ag(4)(3-pttz)(2)](2+) belts. Compounds 2 and 3 reveal the 3D structures based on [Mo(4)O(13)](2-) chains pillared by silver tetrazolate polymeric chains.

Di-μ-sulfato-bis-[diaqua-(1H-imidazo[4,5-f][1,10]phenanthroline)iron(II)] dihydrate.

The title dinuclear Fe(II) complex, [Fe(2)(SO(4))(2)(C(13)H(8)N(4))(2)(H(2)O)(4)]·2H(2)O, is centrosymmetric. Two sulfate anions bridge two Fe(II) cations to form the binuclear complex. Each Fe(II) cation is coordinated by two N atoms from a 1H-imidazo[4,5-f][1,10]phenanthroline (IP) ligand, two O atoms from two sulfate anions and two water mol-ecules in a distorted octa-hedral geometry.

Di-μ-sulfato-κO:O'-bis-[diaqua-(1H-imidazo[4,5-f][1,10]phenanthroline)manganese(II)] dihydrate.

In the title centrosymmetric dinuclear compound, [Mn(2)(SO(4))(2)(C(13)H(8)N(4))(2)(H(2)O)(4)]·2H(2)O, the Mn(II) atom is octa-hedrally coordinated by two N atoms from a 1H-imidazo[4,5-f][1,10]phenanthroline (ip) ligand, two O atoms belonging to two bridging sulfate anions and two water O atoms. In the crystal structure, the complex mol-ecules and the uncoodinated water mol-ecules are connected by O-H⋯O, O-H⋯N and N-H⋯O hydrogen bonds into a three-dimensional network. A π-π stacking inter-action between the pyridyl ring of the ip ligand and the benzene ring of the neighboring ligand [centroid-centroid distance = 3.

1,4-Bis(1H-benzimidazol-2-yl)benzene methanol monosolvate.

The asymmetric unit of the title compound, C(20)H(14)N(4)·CH(4)O, contains two independent half-mol-ecules, each located on an inversion centre, and a methanol solvent mol-ecule. The benzimidazolyl groups form different dihedral angles [24.0 (1) and 11.

Poly[diaqua(mu4-benzene-1,2-dicarboxylato)(isonicotinato-kappa2O,O')gadolinium(III)].

The title neutral polymer, [Gd(C6H4NO2)(C8H4O4)(H2O)2]n, contains an extended two-dimensional wave-like lanthanide carboxylate layer decorated by isonicotinate (IN) ligands. The Gd(II) atom is eight-coordinated by four carboxylate O atoms from four benzene-1,2-dicarboxylate (1,2-bdc) ligands, two 1,2-bdc carboxylate O atoms from one chelating IN ligand and two terminal water molecules, forming a bicapped trigonal-prismatic coordination geometry. The wave-like layers are stacked in an .

(3-Carb-oxy-5-sulfonatobenzoato-κO,O)bis-[2-(2-pyrid-yl)-1H-benzimidazole-κN,N]zinc(II) monohydrate.

In the title compound, [Zn(C(8)H(4)O(7)S)(C(12)H(9)N(3))(2)]·H(2)O, the Zn(II) atom has a distorted octa-hedral coordination geometry, defined by four N atoms from two 2-(2-pyrid-yl)-1H-benzimidazole ligands and two O atoms from a deprotonated carboxyl-ate group of the 3-carb-oxy-5-sulfonatobenzoate ligand. In the crystal structure, the complex mol-ecules are linked into a three-dimensional network by inter-molecular O-H⋯O and N-H⋯O hydrogen bonds, and π-π stacking inter-actions with centroid-centroid separations of 3.758 (2) and 3.

trans-Bis[acetone (2-hydroxy-benzo-yl)hydrazonato-κN',O]bis-(pyridine-κN)zinc(II).

In the title compound, [Zn(C(10)H(11)N(2)O(2))(2)(C(5)H(5)N)(2)], the Zn(II) atom lies on an inversion centre, and is coordinated in a distorted octa-hedral geometry by two carbonyl O atoms and two imino N atoms from two anionic bidentate acetone (2-hydroxy-benzo-yl)hydrazone ligands and by two N atoms from two pyridine mol-ecules. The hydroxyl group acts as a donor, forming an intra-molecular O-H⋯N hydrogen bond.