The polarity of a solvent is a fundamental determinant of its use in chemistry. For molecular liquids, the principles that explain the relationship between molecular structure and solvent polarity are sufficiently well-understood to guide experimentalists in the proper choice of solvent. These principles...
Charge transport and polarity in organic D–A mixed-stack crystals are examined in terms of super-exchange electronic couplings. When the super-exchange coupling is dominated by the interaction between donor HOMO and acceptor LUMO, ambipolar transport is achieved. Otherwise, involvement of other bridge...
Due to the significance of the polarity of the reaction, Diels-Alder reactions should be classified as non-polar (N), polar (P), and ionic (I). 展开 关键词: 2,5-di substituted indole triheterocycles pyrazolines isoxazolines coumarines ...
This oversight of molecular geometry also manifested itself in the students' conceptions of molecular polarity and solubility in water, both of which were based solely on the presence of 展开 关键词: Molecular Properties/Structure Constructivism Organic Chemistry Chemical Education Research Upper-Division ...
The basic rules in chemistry concern stable electron configurations. Completely filled electron shells possess increased stability: the 1s shell, the highest ns-shells, the sp-shell, and the dsp-shell. In addition, a half-filled d or f shell may behave as a stabilized configuration. The importa...
in the spacer unit (see Fig.1). Common aliases, if they exist, are provided in parentheses. Among the systems, COF-CC-1Ph (Fig.1d) is included as a hydrocarbon reference system, whose phenyl linker has no polarity in its carbon-carbon bonds and potentially leads to optimized conditions ...
The wetting property of water is crucial in a variety of chemical, biological and technological systems. Finding the relevance between water and the structure of material surface is the key to understand the wettability of water and other implications such as those design nanostructured devices. In ...
For the solvents studied in this work, the free energy of pyridine protonation becomes more negative with decreasing solvent polarity, or dielectric constant. Computational investigations of the preferred structures of solvent-dependent specific acids are used to estimate the pore-phase proton transfer ...
1a). Here, the addition of dopant atoms introduces charge polarity into the graphitic framework, generating electron-deficient or electron-rich carbon atoms that act as catalytically active moieties. Single-atom catalysts (SACs) are macrocyclic structures in which one or two transition metal centers,...
When the aromatic amino acid residues are gradually exposed to the aqueous solution, the polarity of the microenvironment gradually increases, causing a red shift in the maximum peak. The lignin samples, i.e., untreated lignin, hot water pretreated lignin and ethanol pretreated lignin, which had ...