Elucidating a structure-activity relationship study by evaluating a series of truncated analogues is a simple but important and effective tactic in medicinal chemistry based on natural products with a large and complex chemical structure. In this study, a series of truncated analogues of tunicam...

The enthalpies of formation of H3PW12O40·25.0H2O and H3PW12O40·20.0H2O (HPW), H4SiW12O40·6.0H2O (HSiW), H3PMo12O40·8.6H2O (HPMo), and H4SiMo12O40·12.0H2O (HSiMo) have been determined as −18.58, −17.20, −13.14, −12.72 and −13.92 × 103 kJ mol−1, respectively. The formation enthalpies of the ...

The conditions of the bentonite in an engineered barrier for high-level radioactive waste disposal were simulated in a series of tests. Cylindrical cells with an inner length of 60 cm and a diameter of 7 cm were constructed. Inside the cells, 6 blocks of FEBEX bentonite compacted to a dry densit...

A Keggin-type heteropoly acid revealed high catalytic activity for the etherification such as diethylene glycol with ethanol and cyclization of diethylene glycol in the homogeneous liquid. The catalytic activities of the heteropoly acid were much higher than those of conventional acid catalysts ...

A Keggin-type heteropoly acid revealed high catalytic activities for the etherification of diethylene glycol with ethanol to synthesize diethylene glycol ether in the homogeneous phase. The catalytic activities of heteropoly acid were higher than those of conventional acid catalyst such as sulfu...

Co-doping polypyrrole (PPy) with dodecylbenzenesulfonate and multicharged phosphotungstate anions (PT) from the phosphotungstic acid (PTA) led to free-standing PPy/DBS-PT films, which were studied for their linear actuation properties. FTIR and Raman spectra revealed that PT was successfully emb...

A convenient one-pot synthetic method for the formation of thioethers from various aryl/alkyl halides using heteropoly acid, is described. Heteropoly acid is a simple, cheap and robust catalyst that couples a broad range of electron-deficient as well as electron-rich substrates in excellent yiel...

As a preliminary experiment for the development of an effective silica scale inhibitor at geothermal power plants, the effect of tiron, a ligand to monosilicic acid, on the polymerization of silicic acid was investigated by gel chromatographic method. The experiments were carried out at Si conce...

Selective cascade conversion of cellulose into valuable C2 or C4 products over acid catalysts is still not fully explored because glucose-fructose isomerization followed by fructose conversions is thermodynamically easy to occur during the reaction, leading the formation of C6, C5, C3 and C1 pro...

Silica-supported 12-molybdosilicic acid catalysts prepared by impregnation are studied by IR and Raman spectrometries as a function of the Mo content (Mo wt% varying from 24.6 to 1.2). A dispersion effect is evidenced, especially by Raman spectrometry. The 12-molybdosilicate anion in interaction...

The redox behaviours of 12-molybdophosphoric acid (12-MPA) and 12-molybdosilicic acid (12-MSA) in aqueous acid media are characterized at the carbon fiber (CF) microelectrode. The preparation of CF microelectrode modified with 12-MPA or 12-MSA monolayer and the oxidation-reduction properties of ...

German chamomile (Matricaria recutita L.) is a popular ingredient in herbal teas. In previous study, micromolar bisabololoxide A, one of main constituents in German chamomile, exerted cytotoxic action on rat thymocyte, a normal non-proliferative cell. This result prompted us to study the effect ...

Five antiplasmodial bisabololoxide sesquiterpene diesters were isolated from an EtOAc extract of the aerial parts of Artemisia persica following an HPLC-time-based activity profiling of the extract. Structure elucidation was achieved by 1D and 2D NMR experiments. Relative configurations of cyclo...

Four new, pincer type copper complexes 5–8 were synthesised from the reactions of CuCl2·2H2O with respective hydrazide ligands 1–4 (HL1–HL4) and characterized by various physicochemical techniques. The single crystal XRD and spectral data revealed that all the ligands are monoanionic, triden...

The structural and magnetic properties of the planar Cu2Cl6-xBrx2- dimers in the (morpholinium)2Cu2Cl6 − xBrx salts are investigated. The Cu2Cl62- salt is triclinic, space group P1¯, a = 7.408(7), b = 10.458(10), c = 11.933(12) Å, α = 82.26(2), β = 88.35(2), and γ = 77.22(2)° with Z = 2, wh...

There is heightened interest in determining antioxidant status of individuals in experimental and clinical studies investigating progression of diseases or diverse aspects of oxidative stress, among others. The aim of this study was to evaluate the copper(II) reduction assay with bathocuproinedi...

Two new complexes [Cu(Cand)(H2O)4] [1] and [Cu2(TCand)4(H2O)2]·4H2O [2] (Cand = candesartan; TCand = trityl candesartan) have been synthesized and thoroughly characterized. The FTIR, Raman, EPR and diffuse reflectance spectra of the solid compounds show a dimeric complex for [2] with carboxylat...

In this study, ZnFe-layered double hydroxides were synthesized by a chemical co-precipitation method with different intercalated anions, including chloride and sulfate. They were then modified with graphene oxide to obtain ZnFeCl-LDH/GO and ZnFeSO4-LDH/GO photocatalysts. The as-synthesized sampl...

The present investigation was designed to characterize influence of doping with Al or Mg ions on nature and acidity of sulfate species dispersed on tetragonal-zirconia. Pure and doped zirconias were prepared by the citrate method. Sulfating of the thus produced zirconias was carried out by impre...

In this study, copper sulfate was successfully embedded in filter paper through soaking and copper oxide was successfully embedded in filter paper via in situ technique using the copper sulfate-embedded paper as the starting material. Using color analysis, the filter paper soaked with copper sul...