Later, in his studies on iodine and fluorine compounds, he attributed acidity to aparticularcombinationof hydrogen and the halogen, writing, “aciditydoesnotdependuponanypeculiarelementarysubstances, butuponpeculiarcombinationsofvarioussubstances”. 后来,在他对碘和氟化合物的研究中,他将酸性归因于氢和卤素的...
At the same time, the total acidity of the catalyst decreased. ZnO-species, which have hydrogenating activity, under the reaction conditions removed alkenes from the reaction cycle and thereby reduced the C5+–selectivity of the composite catalyst. Among the studied catalysts, the ZnCrOx-НZSM-5...
Structure and Bonding 18: 177–216. Correlations with Acidity/Basicity and Energy of Interaction The strength of H-bonding increases with greater proton-donating ability of the A–H moiety and increasing proton-accepting power of the base B. Figure 5 shows the effect of differing basicity on ...
Water contains the H-bonding networks that can rearrange according to the changes in the environmental conditions (such as acidity, temperature etc.)3. In water solutions, H-bonds are randomly distributed with equal probability for four H-bonds, i.e. two H-donors and two H-acceptors4. ...
presence of H2S did not affect the catalytic H2evolution notably. We noticed that although revealing a smaller activity, H2S can be directly utilized as a proton source for H2evolution. It is only limited by its low solubility (∼0.2 M in H2O) and acidity (pKa=7;Supplementary Fig. ...
It is also observed that the spectral shifts (ΔνOH) of phenol-Bz and carboxylic acid-Bz complexes show similar dependence on the acidity factor (p Ka). Electronic structure theory has been used to suggest suitable geometries of the complexes that are consistent with the measured IR spectral ...
Porous materials possessing high surface areas are of paramount importance in gas separation and storage, as they can potentially adsorb a large amount of gas per unit of mass or volume. Pore structure and functionality are also important factors affecti
Learn more about this topic: Strong & Weak Acids & Bases | Definition & Examples from Chapter 2 / Lesson 15 92K Understand what weak acids and bases are. Learn the definition of acids, bases, and acidity constant. Discover examples of strong and weak acids and bases. ...
Acidity of Organic Hydrogens The acidity and therefore pKa of H atoms in organic compounds is determined by the stability of the conjugate base and functional group to which the H atom is attached. Conjugate bases can be stabilized by resonance, which delocalizes the negative c...
where they form hydratedchemical species. The acidity of a solution, expressed in terms of a logarithmic function of the activity of such hydrated protons, pH=−lgaH+, is most relevant due to their role in acid-base reactions and speciation equilibria. Definition, concepts and procedures for ...