A new hexamolybdate-based copper-2,2'-biimidazole coordination polymer serving as an acid catalyst and support for enzyme immobilization.

The hydrothermal reaction of (NH)[CoMoOH]·7HO (CoMo), CuCl·2HO and 2,2'-biimidazole (Hbiim) led to the formation of a new coordination polymer, namely poly[diaquabis(2,2'-biimidazole)hexa-μ-oxo-octa-μ-oxo-hexaoxodicopper(II)hexamolybdate(VI)], [CuMoO(CHN)(HO)] (Cu-MoO), at pH 2-3. It is obvious that in the formation of crystalline Cu-MoO, the original Anderson-type skeleton of heteropolymolybdate CoMo was broken and the new isopolyhexamolybdate MoO unit was assembled. In Cu-MoO, one MoO unit connects four [Cu(Hbiim)(HO)] ions in a pentacoordinate mode via four terminal O atoms, resulting in a tetra-supported structure, and each Cu ion is shared by two adjacent MoO units.

Three new Strandberg-type phenylphosphomolybdate supports for immobilizing horseradish peroxidase and their catalytic oxidation performances.

Three organic-inorganic hybrids containing Strandberg-type phenylphosphomolybdate anion [(C6H5PO3)2Mo5O15]4- with phenylphosphonate (PhP) centers, transition metal (TM) ions and 2,2'-biimidazole (H2biim) ligand, formulated as [(TM(H2biim)2)2(C6H5PO3)2Mo5O15]·H2O (TM = Co and Cu, abbreviated as Co-(PhP)2Mo5 and Cu-(PhP)2Mo5, respectively) and ([Ni(H2biim)3])2[(C6H5PO3)2Mo5O15]·2H2O (abbreviated as Ni-(PhP)2Mo5), were self-assembled by simple hydrothermal methods and were systematically characterized through single-crystal X-ray diffraction and other physicochemical and spectroscopic methods, which demonstrated that TM-H2biim complexes were firstly introduced into Strandberg-type organophosphomolybdate skeletons. Selecting the oxidation of cyclohexanol to cyclohexanone as a model reaction, using H2O2 as an oxidant, the catalytic oxidation activities of the Strandberg-type compounds were firstly evaluated. More importantly, these TM-(PhP)2Mo5 (TM = Co, Cu, Ni) compounds were employed to immobilize horseradish peroxidase (HRP), and showed high adsorption capacities for HRP.

Two New Preyssler-Type Polyoxometalate-Based Coordination Polymers and Their Application in Horseradish Peroxidase Immobilization.

Enzyme immobilization is of increasing importance for biocatalysis, for which good supports are critical. Herein, two new Preyssler-type polyoxometalate (POM)-based coordination polymers, namely, {[Cu(H biim) ][{Cu(H biim) (μ-H O)} Cu(H biim)(H O) ]H[({Cu(H biim)(H O) } ) ((μ-C HN Cl ){Cu(H biim)} ){Z(H O)P W O }]⋅x H O} (1: Z=Na, x=9; 2: Z=Ag, x=10; H biim=2,2'-biimidazole) were designed and synthesized. Compounds 1 and 2 exhibit the same skeletons, which contain multiple Cu complex fragments and penta-supported {ZP W } (Z=Na, Ag) clusters.

[Research on the Anti-Pulmonary Fibrosis Effect of the Bletilla striata Polysaccharide in Rat Silicosis Model].

Objective: To investigate the anti-pulmonary fibrosis effect and the possible molecular mechanism of the Bletilla striata polysaccharide.

Methods: Polysaccharide was prepared by water reflux extraction plus ethanol precipitation method, and following deproteinization process by Sevage method. Rat silicosis model was established by invasive intratracheal instillation method.

Effects of arsenic on seed germination and physiological activities of wheat seedlings.

The effects of arsenic (As) were investigated on seed germination, root and shoot length and their biomass and some other factors to elucidate the toxicity of As. The results showed low concentrations of As (0-1 mg/kg) stimulated seed germination and the growth of root and shoot, however, these factors all decreased gradually at high concentrations of As (5-20 mg/kg). The contents of O2*-, MDA, soluble protein and peroxidase (POD) activity all increased with increasing As concentrations.