We report on the activation of CO2 by the well-defined alkylzinc hydroxide (tBuZnOH)6 in the absence and presence of tBu2Zn as an external proton acceptor. The slight modifications in reaction systems involving organozinc precursors enable control of the reaction products with high selectivity leading to the isolation of the mesoporous solid based on ZnCO3 nanoparticles or an unprecedented disc...

Catalytic dehydrocoupling of primary and secondary phosphines has been achieved for the first time using an iron pre-catalyst. The reaction proceeds under mild reaction conditions and is successful with a range of diarylphosphines. A proton acceptor is not needed for the transformation to take place, but addition of 1-hexene does allow for turnover at 50 °C. The catalytic system developed also ...

During the course of our systematic study of water molecule interactions, 1 we recently examined the potential energy surface for the neon atom-water molecule pair. 2 That examination produced an unanticipated feature, namely that a linear hydrogen bond forms, with the neon atom acting as a proton acceptor. By conventional standards,3 that hydrogen bond is weak (0.17 kcal/mole), and would there...

The majority of modern organisms, including many prokaryotes, are aerobes;1 that is, they use molecular oxygen as the terminal electron acceptor for energy generation. Although nearly every redox gradient in nature appears to be utilized by one organism or another,2-4 aerobic metabolism predominates, in large part due to the highly exergonic nature of the four-electron, four-proton (4e/4H+) red...

Articles you may be interested in Quantum and dynamical effects of proton donor-acceptor vibrational motion in nonadiabatic proton-coupled electron transfer reactions Predictions of rate constants and estimates for tunneling splittings of concerted proton transfer in small cyclic water clusters Tunneling currents in long-distance electron transfer reactions. IV. Many-electron formulation. Nonor...

Plasmalemma redox activity in the diatom Thalassiosira is competitively inhibited by antiserum prepared against algal nitrate reductase (NR), and fluorescent labeling experiments reveal the binding of NR antiserum to the cell surface. Furthermore, the external electron acceptor Cu bathophenanthroline disulfonate causes immediate inhibition of intracellular primary amine production. A model is p...

The demand for clean and sustainable energy has garnered great interest in new materials. Among them, high temperature proton-conducting perovskite oxides are, or can be widely used applications (including fuel cells, electrochemical reactors, solid-state separators supports of catalytic components via various reduction oxidation reactions) the intermediate range. control defect chemistry is ma...

In the catalysis of the hydration of carbon dioxide and dehydration of bicarbonate by human carbonic anhydrase II (HCA II), a histidine residue (His64) shuttles protons between the zinc-bound solvent molecule and the bulk solution. To evaluate the effect of the position of the shuttle histidine and pH on proton shuttling, we have examined the catalysis and crystal structures of wild-type HCA II...

In protein environments, proton transfer reactions occur along polar or charged residues and isolated water molecules. These species consist of H-bond networks that serve as proton transfer pathways; therefore, thorough understanding of H-bond energetics is essential when investigating proton transfer reactions in protein environments. When the pKa values (or proton affinity) of the H-bond dono...

Cellular processes such as nerve conduction, energy metabolism, and import of nutrients into cells all depend on transport of ions across biological membranes through specialized membrane-spanning proteins. Understanding these processes at a molecular level requires mechanistic insights into the interaction between these proteins and the membrane itself. To explore the role of the membrane in i...