Coupling Ruthenium Bipyridyl and Cobalt Imidazolate Units in a Metal-Organic Framework for an Efficient Photosynthetic Overall Reaction in Diluted CO.

Artificial photocatalytic CO reduction, using water as the reductant, is challenging mainly because it is difficult for multiple functional units to cooperate efficiently. Here, we show that the classic photosensitive and HO-oxidizing ruthenium bipyridyl units and CO-reducing cobalt imidazolate units can be incorporated into a metal-organic framework using a classic organic ligand, imidazo[4,5-][1,10]phenanthroline. Under visible light without additional sacrificial agents and photosensitizers, the overall conversion of CO and HO to CO and O was achieved by the multifunctional photocatalyst in the CHCN/HO mixed solvent with a high CO production rate of 11.

Sphingobacterium bovistauri sp. nov., Isolated from the Faeces of Bos Taurus.

A novel bacterium designated WQ 366 was isolated from the faeces of Bos taurus, foraging on the slopes of the Baima Snow Mountain in Yunnan, China. The isolate grew optimally at 30 ℃ and pH 7.0-8.

sp. nov., a bacterium isolated from the faeces of .

A novel Gram-stain-negative strain, WQ 117, isolated from the faeces of collected at Yunnan Snub-nosed Monkey National Park, Yunnan province, PR China, was subjected to a polyphasic taxonomic study. The results of phylogenetic analysis based on 16S rRNA gene sequences indicated that the isolate represented a member of the genus , sharing 97.64 % sequence similarity with the type strain YIM 102668.

Sphingobacterium rhinopitheci sp. Nov., isolated from the faeces of Rhinopithecus bieti in China.

A novel bacterium, WQ 047, was isolated from the faeces of Rhinopithecus bieti, a highly endangered primate endemic to China. The cells were aerobic, oval/rod-shaped, Gram-stain-negative, non-motile, catalase positive, and produced yellow pigmented colonies on Columbia Agar. The taxonomic position of WQ 047 was clarified by applying a polyphasic study based on 16S rRNA gene sequence phylogenetic analysis, extensive biological typing, and whole genome sequencing.

An exceptionally stable octacobalt-cluster-based metal-organic framework for enhanced water oxidation catalysis.

Extensive efforts have been devoted to developing efficient and durable catalysts for water oxidation. Herein, we report a highly stable metal-organic framework that shows high catalytic activity and durability for electrically driven (an overpotential of 430 mV at 10 mA cm in neutral aqueous solution) and photodriven (a turnover frequency of 16 s and 12 000 cycles) water oxidation, representing the best catalyst for water oxidation reported to date. Computational simulation and isotope tracing experiments showed that the μ-OH group of the {Co(μ-OH)} unit participates in the water oxidation reaction to offer an oxygen vacancy site with near-optimal OH adsorption energy.

Hydroxide Ligands Cooperate with Catalytic Centers in Metal-Organic Frameworks for Efficient Photocatalytic CO Reduction.

Converting CO into fuels via photochemical reactions relies on highly efficient and selective catalysts. We demonstrate that the catalytic active metal center can cooperate with neighboring hydroxide ligands to boost the photocatalytic CO reduction. Six cobalt-based metal-organic frameworks (MOFs) with different coordination environments are studied at the same reaction condition (photosensitizer, electron donor, water/organic mixed solvent, and visible light).

Anticarcinogenic effect of Umbelliferone in human prostate carcinoma: An in vitro study.

Purpose: To explore the chemoprotective effect of umbelliferone (UF) on prostate cancer cell lines, i.e. primary stage (LnCap) and last stage (PC3) prostate cancer together with the effect on the induction of apoptosis and alteration on cell cycle arrest.

Modular and Stepwise Synthesis of a Hybrid Metal-Organic Framework for Efficient Electrocatalytic Oxygen Evolution.

The paddle-wheel type cluster Co(RCOO)(L) (R = substituent group, L = terminal ligand), possessing unusual metal coordination geometry compared with other cobalt compounds, may display high catalytic activity but is highly unstable especially in water. Here, we show that with judicious considerations of the host/guest geometries and modular synthetic strategies, the labile dicobalt clusters can be immobilized and stabilized in a metal-organic framework (MOF) as coordinative guests. The Fe(na)(L) fragment in the MOF [{Fe(μ-O)(bdc)}{Fe(na)(L)}] (Hbdc = 1,4-benzenedicaboxylic acid, Hna = nicotinic acid) can be removed to give [{Fe(μ-O)(bdc)}] with a unique framework connectivity possessing suitable distribution of open metal sites for binding the dicobalt cluster in the form of Co(na)(L).

Synthesis and stabilization of a hypothetical porous framework based on a classic flexible metal carboxylate cluster.

By using pyridyl derivatives 4-cyanopyridine (4-pyCN) or nicotinate (na(-)) as terminal ligands (L(T)) to decorate the flexible trigonal-prismatic trinuclear metal carboxylate M3(μ3-O/μ3-OH)(RCOO)6(L(T))3 clusters, a theoretically predicted uninodal 6-connected flu-e network for [M3(μ3-O/μ3-OH)(bdc)3(L(T))3] (H2bdc = 1,4-benzenedicarboxylic acid) has been realized in three new porous coordination frameworks. The flu-e topology is isomeric to the uninodal 6-connected acs (MIL-88) and tetranodal 6-connected mtn-e (MIL-101) ones observed in the classic metal carboxylate framework materials, but comprises of unique cubic cages which require exceptional conformation for the trinuclear clusters. The weak coordinating 4-pyCN terminal ligands tend to leave the clusters during thermal activation, leading to framework distortion and reduction of the long-range order of the flu-e network, which can only be restored by 4-pyCN instead of other guest molecules.

Polyoxoniobate-based 3D framework materials with photocatalytic hydrogen evolution activity.

Two phosphoniobate-based 3D frameworks were firstly constructed using the hexa-capped Keggin polyoxoniobates [PNb12O40(VO)6](3-) and copper cations. Photocatalytic studies indicated that the hybrid materials exhibit photocatalytic hydrogen evolution activity.

Unprecedented high-nuclear transition-metal-cluster-substituted heteropolyoxoniobates: synthesis by {V8 } ring insertion into the POM matrix and antitumor activities.

Reactions of hexaniobate with vanadate in the presence of Ni(2+) , Zn(2+) , or Cu(2+) have furnished three high-nuclear vanadium cluster-substituted heteropolyoxoniobates (HPNs): {Ni(en)3 }5 H{V(V) Nb8 V(IV) 8 O44 }⋅9 H2 O (1), (H2 en)Na2 [{Zn(en)2 (Hen)}{Zn(en)2 (H2 O)}2 {PNb8 V(IV) 8 O44 }]⋅11 H2 O (2), and Na{Cu(en)2 }3 {[Cu(en)2 ]2 [PNb8 V(IV) 8 O44 ]}⋅11 H2 O (3) (en=1,2-diaminoethane). Their structures have been determined and characterized by single-crystal X-ray diffraction analysis, thermogravimetric analysis (TGA), and elemental analysis. Structural analysis has revealed that compounds 1-3 contain similar {V8 }-substituted [X(V) Nb8 V(IV) 8 O44 ](11-) (X=P, V) clusters, obtained by inserting a {V8 } ring into tetravacant HPN [XNb8 O36 ](27-) .

Self-assembly and photocatalytic property of germanoniobate [H6Ge4Nb16O56]10-: encapsulating four {GeO4} tetrahedra within a {Nb16} cage.

An unprecedented organic-inorganic hybrid germanoniobate compound Na4[Cu(en)2(H2O)2]5[Na6Ge8Nb32O108H8(OH)4]·41H2O (1) was synthesized under the hydrothermal condition. In compound 1, the {Nb16} cage containing four {GeO4} tetrahedra in its internal cavity results in a heteropolyniobate anion [H4Ge4Nb16O54(OH)2](10-) ({Ge4Nb16}), which is connected by a {Na6} cluster into the first germanoniobate-based sandwich-type structure. Further, the sandwich germanoniobates are connected by [Na2Cu(en)2O6H8] groups into a porous network with one dimensional channels along the a-axis.