Incorporation of the triazolyl moiety modulates the basicity and effective size of the chelating ring, changes the stoichiometry in complex formation and thereby imparts Cu(2+) ion selectivity.

The concept of “solvent polarity” is widely used to explain the effects using different solvents in various scientific applications. However, a consensus regarding its definition and quantitative measure still lacking, hindering progress solvent-based research. This study hopes add conversation by presenting development two linear regression models for solvent polarity, based on Reichardt’s ET(...

To provide further insight into electronic and steric factors and to quantify their relative importance, we studied in detail the migratory CO insertion step for RhMe(CO)I2(L–L) systems (L–L = dppms (PPh2CH2P(S)Ph2) or dppe (PPh2CH2CH2PPh2)), Monsanto catalysts and some electronically unsymmetrical diphosphine model systems. The difference in the reaction rates of dppms and dppe has a clear ele...

In the field of organic chemistry, a base is generally defined as a reagent capable of abstracting proton to yield a carbanion species. At a basic textbook level, organobases are normally limited to amines, which are categorized as very weak bases according to the above definition. The introduction of an imine function (1⁄4NH) to the a-carbon of amines affords more basic amine species, amidines...

An environmentally benign process was developed for the transesterification of Jatropha curcas L. seed oil with methanol using artificial zeolites loaded with potassium acetate as a heterogeneous catalyst. After calcination for 5 h at 823 K, the catalyst loaded with 47 wt.% CH3COOK exhibited the highest efficiency and best catalytic activity. The easily prepared catalysts were characterized by ...

The influence of slag basicity and CrO content on the viscosity CaO–SiO2–2%MgO–CrO slags has been experimentally determined. decreases with increasing basicity, Cr2O3 content. Both MgO have a basic characteristic acts as network modifier. activation energy further validates these observations. degree polymerization is also found to decrease addition CrO.

The effect of A-site cation ordering on the cathode performance and chemical stability of A-site cation ordered LaBaCo₂O5+δ and disordered La0.5Ba0.5CoO3-δ materials are reported. Symmetric half-cells with a proton-conducting BaZr0.9Y0.1O3-δ electrolyte were prepared by ceramic processing, and good chemical compatibility of the materials was demonstrated. Both A-site ordered LaBaCo₂O5+δ and A-s...

The nucleophilicity and Lewis basicity of DBU and DBN toward C(sp(2)) centers have been measured: nucleophilicities increase in the series DMAP < DBU < DBN < DABCO while Lewis basicities are DABCO < DMAP < DBU < DBN.

Azoheteroarene photoswitches offer functional advantages over their more conventional azobenzene counterparts by virtue of their heteroaromatic ring(s). Here we report that azobis(2-imidazole) functions as a photoswitchable base due to the additional proton stabilisation that is possible in the protonated Z isomer, facilitated by the basic imidazole nitrogens. This thermodynamic difference in s...