Chemistry

Chemistry

A branch of physical science that is concerned with the study of matter and energy and how they interact.

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Chemistry > Physical organic chemistry

chemical shift (NMR)

Chemistry; Physical organic chemistry

The variation of the resonance frequency of a nucleus in nuclear magnetic resonance (NMR) spectroscopy in consequence of its magnetic environment. The chemical shift of a nucleus, ...

chemical species

Chemistry; Physical organic chemistry

An ensemble of chemically identical molecular entities that can explore the same set of molecular energy levels on the time scale of the experiment. The term is applied equally to ...

chemically induced dynamic nuclear polarization (CIDNP)

Chemistry; Physical organic chemistry

Non-Boltzmann nuclear spin state distribution produced in thermal or photochemical reactions, usually from colligation and diffusion, or disproportionation of radical pairs, and ...

chemoselective, chemoselectivity

Chemistry; Physical organic chemistry

Chemoselectivity is the preferential reaction of a chemical reagent with one of two or more different functional groups. A reagent has a high chemoselectivity if reaction occurs ...

chromophore

Chemistry; Physical organic chemistry

The part (atom or group of atoms) of a molecular entity in which the electronic transition responsible for a given spectral band is approximately localized. The term arose in the ...