Category archives: Chemistry

Metal atoms enhance quantum dot coupling in metal-organic nanoporous networks

Metal atoms enhance quantum dot coupling in metal-organic nanoporous networks

ChemistryCondensed matterMaterialsQuantum physics

By DIPC

A quantum dot (QD) is a nanometric crystalline structure of semiconductor materials. In a QD electrons are confined in a region of space, thus creating a well defined structure of energy levels that depends very much on the size and shape of the quantum dot. This structure resembles that of atoms, that is why sometimes […]

Flavin bioorthogonal photocatalysis mechanism

Flavin bioorthogonal photocatalysis mechanism

Chemistry

By DIPC

A catalyst is a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change. As the catalyst itself takes part in the reaction it may undergo a physical change. Metal complexes are typically regarded as catalysts that convert organic substrates into more valuable compounds; however, to date, catalytic transformations […]

Tracking the tautomerization of a single molecule in space and time

Tracking the tautomerization of a single molecule in space and time

ChemistryCondensed matterNanotechnology

By DIPC

There are chemical compounds, called isomers, that have the same molecular formulae but different molecular structures or different arrangements of atoms in space. In constitutional isomerism the molecules have different molecular structures: i.e., they may be different types of compound, or they may simply differ in the position of the functional group in the molecule […]

Excited-state aromaticity

Excited-state aromaticity

ChemistryMaterials

By DIPC

We usually take for granted that aromaticity is something that belongs to the ground state of a molecule; but the fact is that nothing forbids aromaticity appearing in an excited state. In the same way that molecular properties are largely affected by the ground-state aromaticity, excited-state aromaticity can guide the understanding of excited-state processes, the […]

Direct observation of dynamic tube dilation in entangled polymer blends

Direct observation of dynamic tube dilation in entangled polymer blends

ChemistryCondensed matterMaterialsPhysics

By DIPC

One of the unique features of the chemistry of carbon (and, to some extent, silicon) is its ability to form long chains of atoms. Polymers are substances that have macromolecules composed of many repeating units (known as ‘mers’). Many naturally occurring substances are polymers, including rubber and many substances based on glucose, such as the […]

First nondestructive enantioselective detection technique

First nondestructive enantioselective detection technique

ChemistryCondensed matterMaterialsNanotechnology

By DIPC

If a nucleus has a nonzero spin, it behaves as a small magnet. Therefore, in an external magnetic field, the nuclear magnetic moment vector precesses about the field direction but only certain otientations are allowed by quantum rules. Thus, for hydrogen (spin 1/2) there are two possible states in the presence of a field, each […]